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Articles 61 - 90 of 2134
Full-Text Articles in Engineering
Is Halogen Content The Most Important Factor In The Removal Of Halogenated Trace Organics By Mbr Treatment?, Faisal I. Hai, Nichanan Tadkaew, James A. Mcdonald, Stuart J. Khan, Long Nghiem
Is Halogen Content The Most Important Factor In The Removal Of Halogenated Trace Organics By Mbr Treatment?, Faisal I. Hai, Nichanan Tadkaew, James A. Mcdonald, Stuart J. Khan, Long Nghiem
Long D Nghiem
Incorporating Sustainable Practice in Mechanics of Structures and Materials covers a wide range of topics, from composite structures, via fire engineering and masonry structures, to timber engineering. Valuable reference for academics, researchers and practicing engineers working in structural engineering and structural mechanics. Summary Incorporating Sustainable Practice in Mechanics of Structures and Materials is a collection of peer-reviewed papers presented at the 21st Australasian Conference on the Mechanics of Structures and Materials (ACMSM21, Victoria, University, Melbourne, Australia, 7th – 10th of December 2010). The contributions from academics, researchers and practicing engineers from 17 countries, mainly from Australasia and the Asia-pacific region, …
Removal Of Heavy Metals Form Mining Impacted Water By A Novel Electrocoagulation-Ultrafiltration Hybrid Process, Liam Pettigrew, Long Nghiem, Muttucumaru Sivakumar
Removal Of Heavy Metals Form Mining Impacted Water By A Novel Electrocoagulation-Ultrafiltration Hybrid Process, Liam Pettigrew, Long Nghiem, Muttucumaru Sivakumar
Long D Nghiem
No abstract provided.
Influence Of Organic And Colloidal Fouling On The Removal Of Sulfamethoxazole By Nanofiltration Membranes, Long Nghiem, Christiane Espendiller, Gerd Braun
Influence Of Organic And Colloidal Fouling On The Removal Of Sulfamethoxazole By Nanofiltration Membranes, Long Nghiem, Christiane Espendiller, Gerd Braun
Long D Nghiem
This study investigated the effects of organic and colloidal fouling on the removal of a representative micropollutant sulfamethoxazole by two commercially available NF membranes. Alginate, bovine serum albumin, and colloidal silica were selected as model foulants to simulate hydrophilic and hydrophobic organic fractions, and colloidal matter that are often found in treated effluent and surface water. Membrane fouling was related to the membrane and foulant characteristics and subsequently the separation behaviour of the micropollutant sulfamethoxazole under different solution pH. On the basis of these results, it was confirmed that membrane fouling is strongly dependent on both the foulant and membrane …
Trace Organic Removal By Nanofiltration And Reverse Osmosis Processes, Long Nghiem
Trace Organic Removal By Nanofiltration And Reverse Osmosis Processes, Long Nghiem
Long D Nghiem
This monograph delineates the retention mechanisms of emerging trace organic contaminants by several nanofiltration (NF) and reverse osmosis membranes. Retention of neutral trace organics by a tight NF or RO membrane is dominated by steric (size) exclusion, whereas both electrostatic repulsion and steric exclusion govern the retention of negatively charged trace organics by a loose NF membrane. Speciation of trace organics may lead to a dramatic change in retention as a function of pH, with much greater retention observed for ionized, negatively charged trace organics. Retention of the negatively charged trace organics decreases as the solution?s ionic strength increases due …
Sorption Characteristic Of Coal, Particle Size, Gas Type And Time, Raul Maria Melgarejo Florentin, Najdat Aziz, Dennis Black, Long Nghiem
Sorption Characteristic Of Coal, Particle Size, Gas Type And Time, Raul Maria Melgarejo Florentin, Najdat Aziz, Dennis Black, Long Nghiem
Long D Nghiem
Sorption characteristics of Bulli seam coal samples were examined with respect to coal particle size, gas type and time. Sorption tests were carried out by the indirect gravimetric method for determining gas content in coal. Various coal particle sizes were tested in addition to 54 mm diameter coal core. The other coal sizes were ±15 mm (-5/8+0.530 mesh) cubical blocks and coal fragments of ±1.18 mm (-0.256+16 mesh), ±6.70 mm (-5/16+0.256 mesh), and ±8.00 mm (-5/8+5/16 mesh). The samples were maintained in specially designed pressure vessels, at constant temperature of 24 °C and subjected to gas pressures up to maximum …
Preparation Of Titanium Dioxide Nanoparticles From Electrocoagulated Sludge Using Sacrificial Titanium Electrodes, H K. Shon, S Phuntsho, S Vigneswaran, Jaya Kandasamy, Long Nghiem, G J. Kim, J B. Kim, Jin-Ho Kim
Preparation Of Titanium Dioxide Nanoparticles From Electrocoagulated Sludge Using Sacrificial Titanium Electrodes, H K. Shon, S Phuntsho, S Vigneswaran, Jaya Kandasamy, Long Nghiem, G J. Kim, J B. Kim, Jin-Ho Kim
Long D Nghiem
A comprehensive investigation of electrocoagulation using sacrificial titanium (Ti) electrodes in wastewater was carried out. The effects of specific process variables, such as initial pH, mixing, current density, initial organic loading, and ionic/electrolyte strength were first optimized to produce recyclable Ti-based sludge. The sludge was incinerated at 600 °C to produce functional TiO2 photocatalyst. X-ray diffraction analysis revealed that TiO2 produced at optimum electrocoagulation conditions was mostly anatase structure. The specific surface area of the synthesized TiO2 photocatalyst was higher than that of the commercially available and widely used Degussa P-25 TiO2. Furthermore, energy dispersive X-ray and X-ray photoelectron spectroscopy …
Enantiospecific Fate Of Ibuprofen, Ketoprofen And Naproxen In A Laboratory-Scale Membrane Bioreactor, Nor Hazlina Hashim, Long Nghiem, R.M. Stuetz, Stuart J. Khan
Enantiospecific Fate Of Ibuprofen, Ketoprofen And Naproxen In A Laboratory-Scale Membrane Bioreactor, Nor Hazlina Hashim, Long Nghiem, R.M. Stuetz, Stuart J. Khan
Long D Nghiem
The enantiospecific fate of three common pharmaceuticals was monitored in a laboratory-scale membrane bioreactor (MBR). The MBR was operated with a hydraulic retention time of 24 h and a mixed liquor suspended solids concentration of 8.6–10 g/L. Standard solutions of ibuprofen, ketoprofen and naproxen were dosed into the synthetic feed of the MBR. Influent and permeate samples were then collected for enantiospecific analysis. The individual (R)- and (S)-enantiomers of the three pharmaceuticals were derivatised using a chiral derivatizing agent to form pairs of diastereomers, which could then be separated and analysed by gas chromatography–tandem mass spectrometry (GC–MS/MS). Accurate quantitation of …
Treatment Of Acidic Groundwater In Acid Sulfate Soil Terrain Using Recycled Concrete: Column Experiments, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem, A. Golab, B Guru Prasad
Treatment Of Acidic Groundwater In Acid Sulfate Soil Terrain Using Recycled Concrete: Column Experiments, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem, A. Golab, B Guru Prasad
Long D Nghiem
Acidic groundwater generated from pyrite oxidation in acid sulfate (AS) soil is a major geoenvironmental problem in Australia. This study aims to evaluate recycled concrete as a reactive material in permeable reactive barriers (PRBs) for the remediation of acidic groundwater in low-lying AS soil floodplains. Laboratory experiments were systematically conducted to investigate the acid neutralization behavior of recycled concrete and its potential to remove dissolved Al and Fe. The results confirmed that recycled concrete could effectively treat acidic groundwater from an AS soil terrain, resulting in near neutral effluent over a long period with complete removal of Al and Fe. …
Embedding Graduate Attribute Development Into The Engineering Curriculum: Less Is More?, Long Nghiem, Thomas L. Goldfinch, Maureen E. Bell
Embedding Graduate Attribute Development Into The Engineering Curriculum: Less Is More?, Long Nghiem, Thomas L. Goldfinch, Maureen E. Bell
Long D Nghiem
'Graduate Attributes' is a term which all too frequently sends shivers down the spines of engineering academics. The idea of having to instil a diverse set of professional behaviours and attitudes in youthful engineering students, while still ensuring a level of technical competence, can be intimidating for many. With high stakes associated with accreditation, high level university policy, and external government auditing, there can be perception that addressing as many different attributes as possible in a subject is desirable. Recent research at the University of Wollongong suggests that the idea of tackling several different Graduate attributes may be ineffective. This …
Treatment Of High Tds Liquid Waste: Is Zero Liquid Discharge Feasible?, Alexander Robertson, Long Nghiem
Treatment Of High Tds Liquid Waste: Is Zero Liquid Discharge Feasible?, Alexander Robertson, Long Nghiem
Long D Nghiem
A zero liquid discharge treatment system for the disposal of saline industrial liquid waste was proposed and evaluated in this study. Microfiltration was selected as a pretreatment process after a qualitative assessment against `conventional¿ options. Two reverse osmosis (RO) membranes were examined for the pre-concentration of liquid waste using a laboratory scale membrane rig. The results were used to validate the use of the ROSA simulation package. ROSA simulation was conducted with liquid waste having a range of salinity of up to 100,000 ppm of total dissolved solid (TDS). Results reported here indicated that RO membranes were highly suitable for …
Coupling Effects Of Feed Solution Ph And Ionic Strength On The Rejection Of Boron By Nf/Ro Membranes, Kha Tu, Long Nghiem, Allan Chivas
Coupling Effects Of Feed Solution Ph And Ionic Strength On The Rejection Of Boron By Nf/Ro Membranes, Kha Tu, Long Nghiem, Allan Chivas
Long D Nghiem
The coupling effects of solution pH and ionic strength on boron rejection by nanofiltration (NF) and reverse osmosis (RO) membranes were investigated. Two NF membranes (namely NF270 and NF90) and three RO membranes (namely BW30, SW30 and UTC80) were used to provide a full spectrum of NF/RO membranes. The rejection of boron by all five membranes was pH-dependent. The dependency of boron rejection on the feed solution pH became much more substantial as the nominal salt (sodium or calcium) rejection value of the membrane decreased. At pH 11, boron rejections by the NF90 and the NF270 membranes were only 10% …
Role Of Electrostatic Interactions In The Retention Of Pharmaceutically Active Contaminants By A Loose Nanofiltration Membrane, Long Nghiem, Andrea Schaefer, Menachem Elimelech
Role Of Electrostatic Interactions In The Retention Of Pharmaceutically Active Contaminants By A Loose Nanofiltration Membrane, Long Nghiem, Andrea Schaefer, Menachem Elimelech
Long D Nghiem
The role of electrostatic interactions in the separation of pharmaceuticals by a loose nanofiltration (NF) membrane was examined. While retention of the non-ionizable pharmaceutical carbamazepine was relatively independent of the solution chemistry, retention of the ionizable pharmaceuticals sulfamethoxazole and ibuprofen was strongly influenced by the solution pH and ionic strength. This finding is consistent with previous results investigating the effects of solution pH and ionic strength on the retention of proteins and organic acids. Pharmaceutical retention increases dramatically as the compound transforms from a neutral to a negatively charged species when the solution pH increases above its pKa …
Calibrating Engineering Graduate Capabilities Against Assessment Tasks: A Preliminary Study, Long Nghiem, Maureen Bell
Calibrating Engineering Graduate Capabilities Against Assessment Tasks: A Preliminary Study, Long Nghiem, Maureen Bell
Long D Nghiem
This paper investigated the connection between assessment tasks and graduate capabilities. Surveys conducted as part of this study revealed differences in planning for the development of, and student achievement of, graduate capabilities and that assessment tasks were valuable tools to guide and facilitate the development of intended graduate capabilities. Drawing from the obtained data, a prototype framework for curriculum design was proposed, allowing for better alignment of assessment tasks and graduate capability development in systematic subject design.
Effect Of Fouling On Removal Of Trace Organic Compounds By Nanofiltration, Shima Hajibabania, A Verliefde, Jörg E Drewes, Long Nghiem, J Mc Donald, S Khan, P Le-Clech
Effect Of Fouling On Removal Of Trace Organic Compounds By Nanofiltration, Shima Hajibabania, A Verliefde, Jörg E Drewes, Long Nghiem, J Mc Donald, S Khan, P Le-Clech
Long D Nghiem
The fate of chemical of concern is not yet fully understood during treatment of impaired waters. The aim of this paper is to assess the impact of different organic-based fouling layers on the removal of a large range of trace organics. Both model and real water samples (mixed with trace organic contaminants at environmental concentration of 2 μg l−1) were used to simulate fouling in nanofiltration under controlled environment. The new and fouled membranes were systematically characterised for surface charge, hydrophobicity and roughness. It was observed that fouling generally reduced the membrane surface charge; however, the alterations of the membrane …
Rejection Of Pharmaceutically Active Compounds By Forward Osmosis: Role Of Solution Ph And Membrane Orientation, Ming Xie, William E. Price, Long D. Nghiem
Rejection Of Pharmaceutically Active Compounds By Forward Osmosis: Role Of Solution Ph And Membrane Orientation, Ming Xie, William E. Price, Long D. Nghiem
Long D Nghiem
The effects of feed solution pH and membrane orientation on water flux and the rejection of carbamazepine and sulfamethoxazole were investigated using a bench scale forward osmosis (FO) system. Water flux was pH-dependent in both membrane orientations. In addition, water flux increased while the specific reverse salt flux and hydrogen ion flux decreased with increasing feed solution pH. Water flux was lower in the normal FO mode compared to that in the pressure retarded osmosis (PRO) mode because osmotic pressure differential was reduced due to the internal concentration polarisation (ICP) phenomenon. The rejection of neutral carbamazepine was generally pH independent …
Effects Of Membrane Fouling On The Nanofiltration Of Trace Organic Contaminants, Long Nghiem, Simon Hawkes
Effects Of Membrane Fouling On The Nanofiltration Of Trace Organic Contaminants, Long Nghiem, Simon Hawkes
Long D Nghiem
Organic fouling and its effects on trace organic retention by three nanofiltration (NF) membranes were investigated in this study. An accelerated fouling condition was achieved with foulant cocktail containing humic acids in background electrolyte solution. The effects of membrane fouling on the separation process was delineated by comparing theretention values of clean and fouled membranes and relate them to the membrane pore size as well as physicochemical characteristics of the trace organics. Fouling was more severe for the more open pore size TFC-SR2 and NF 270 membranes as compared to the tighter NF 90membrane. Results reported here indicate that retention …
Effects Of Organic Fouling On The Removal Of Trace Organic Contaminants By Nanofiltration Processes, Long Nghiem, Stuart Khan, Dirk Vogel
Effects Of Organic Fouling On The Removal Of Trace Organic Contaminants By Nanofiltration Processes, Long Nghiem, Stuart Khan, Dirk Vogel
Long D Nghiem
No abstract provided.
Armouring By Precipitates And The Associated Reduction In Hydraulic Conductivity Of Recycled Concrete Aggregates Used In A Novel Prb For The Treatment Of Acidic Groundwater, Punyama Pathirage, Buddhima Indraratna, Long Duc Nghiem, Laura Banasiak, Gyanendra Regmi
Armouring By Precipitates And The Associated Reduction In Hydraulic Conductivity Of Recycled Concrete Aggregates Used In A Novel Prb For The Treatment Of Acidic Groundwater, Punyama Pathirage, Buddhima Indraratna, Long Duc Nghiem, Laura Banasiak, Gyanendra Regmi
Long D Nghiem
Acidic groundwater generated from acid sulphate soil (ASS) is a major geo-environmental problem in Australia. A permeable reactive barrier (PRB) with recycled concrete aggregates as the reactive material has received considerable attention as an innovative, cost effective technology for passive treatment of acidic groundwater in ASS terrain. Laboratory column experiments conducted at the University of Wollongong investigated the acid neutralisation behaviour of recycled concrete and its potential to remove dissolved aluminium (Al) and iron (Fe). The recycled concrete effectively treated the acidic groundwater, resulting in near-neutral effluent pH and complete removal of Al and Fe. However, armouring of the concrete …
Fouling In Greywater Recycling By Direct Ultrafiltration, Long Nghiem, Andrea Schaefer, Nadine Oschmann
Fouling In Greywater Recycling By Direct Ultrafiltration, Long Nghiem, Andrea Schaefer, Nadine Oschmann
Long D Nghiem
Greywater is no doubt a valuable resource that can be used to alleviate water shortage and increase water conservation in individual households. It is particularly important for arid and semi-arid regions like Australia. Treated greywater can also be used for many activities within the household such as toilet flushing, garden watering, car washing, or pavement cleansing. This study examines the fouling behaviour of submerged ultrafiltration membranes in greywater recycling under concentration variation of common greywater constituents. The results indicate that the use of ultrafiltration directly for greywater recycling in individual households is promising. As expected, increase in particulate matter concentration …
Performance Of A Novel Osmotic Membrane Bioreactor (Ombr) System: Flux Stability And Removal Of Trace Organics, Abdulhakeem Alturki, James Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long Nghiem
Performance Of A Novel Osmotic Membrane Bioreactor (Ombr) System: Flux Stability And Removal Of Trace Organics, Abdulhakeem Alturki, James Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long Nghiem
Long D Nghiem
Results reported here highlight the potential and several challenges in the development of a novel osmotic membrane bioreactor (OMBR) process for the treatment of municipal wastewater. Following the initial gradual decline, a stable permeate flux value was obtained after approximately four days of continuous operation. There was evidence of continuous deterioration of biological activity of the OMBR system, possibly due to the build-up of salinity in the reactor. The removal of 25 out of 27 trace organic compounds with molecular weight higher than 266 g/mol was above 80% and was possibly governed by the interplay between physical separation of the …
Technical Comparison Of Harmonic Mitigation Techniques For Industrial Electrical Power Systems, Almoataz Abdelaziz
Technical Comparison Of Harmonic Mitigation Techniques For Industrial Electrical Power Systems, Almoataz Abdelaziz
Almoataz Youssef Abdelaziz
Power system harmonics cause many problems like equipment failures, malfunctions and plant shutdowns. Accordingly, mitigation of these harmonics is considered an important target especially for the industrial applications where any short downtime period may lead to great economic losses. There are at least ten different mitigation techniques to choose from, each with specific technical advantages and disadvantages. Comparative studies for the harmonic mitigation techniques in industrial electrical systems are rarely found in the literature even though they are strongly needed. This paper, almost for the first time, provides comprehensive technical comparisons between the various practical harmonics mitigation techniques in the …
Detection Of Line Outage In Transmission Networks Using Phasor Measurement Units Aided By Support Vector Machine Algorithms, Almoataz Youssef Abdelaziz
Detection Of Line Outage In Transmission Networks Using Phasor Measurement Units Aided By Support Vector Machine Algorithms, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Many protection applications are based upon the Phasor Measurement Units (PMUs) technology. Therefore, PMUs have been increasingly widespread throughout the power network, and there are several researches have been made to locate the PMUs for complete system observability. This paper introduces an important application of PMUs in power system protection which is the detection of single line outage. In addition, a detection of the out of service line is achieved depending on the variations of phase angles measured at the system buses where the PMUs are located. Hence, a protection scheme from unexpected overloading in the network that may lead …
Protection Schemes Based On Support Vector Machine For Thyristor Controlled Series Compensated Transmission Line, Almoataz Youssef Abdelaziz
Protection Schemes Based On Support Vector Machine For Thyristor Controlled Series Compensated Transmission Line, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Recently, series compensation is widely used in transmission. However, this creates several problems to conventional protection approaches. This paper presents overcurrent and distance protection schemes, for fault classification in transmission lines with thyristor controlled series capacitor (TCSC) using support vector machine (SVM). The fault classification task is divided into four separate subtasks (SVMa, SVMb, SVMc and SVMg), where the state of each phase and ground is determined by an individual SVM. The polynomial kernel SVM is designed to provide the optimal classification conditions. Wide variations of load angle, fault inception angle, fault resistance and fault location have been carried out …
Phasor Measurement Units (Pmus) Based Fault Location Of Series Compensated Transmission Lines, Almoataz Youssef Abdelaziz
Phasor Measurement Units (Pmus) Based Fault Location Of Series Compensated Transmission Lines, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Phasor Measurement Units (PMUs) have gained a great popularity in the field of control and wide area protection during the last decade. One of the major protection applications based on PMUs technology is to determine the fault location in a transmission line. Therefore, several researches have been developed in the field of fault location. Some of the researches are based on one-end measurements. But, a greater accuracy has been achieved on the basis of two-end measurements. Many researchers suggested only voltage measurements to avoid the current transformers (CT) errors. While, others suggested methods depend on both voltages and current measurements …
Optimal Pmu Placement For Complete Observability Using Heuristic Methods, Almoataz Youssef Abdelaziz
Optimal Pmu Placement For Complete Observability Using Heuristic Methods, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
An essential tool for power system monitoring is state estimation. Phasor Measurement Units (PMUs) can greatly improve the state estimation process. However, for state estimation, the PMUs should be placed appropriately in the network. The problem of optimal PMU placement for full observability is analyzed in this paper. The objective of the paper is to minimize the size of the PMU configuration while allowing full observability of the network. At first, an optimal measurement set is determined to achieve full power system observability with ignoring zero injection buses. Then, the derived schemes are modified to maintain the observability after considering …
Transient Security Classification Using Gene Expression Programming Algorithm, Almoataz Youssef Abdelaziz
Transient Security Classification Using Gene Expression Programming Algorithm, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
No abstract provided.
An Assessment Of The Effects Of Desertification In Yobe State, Nigeria, Jibril Musa Phd
An Assessment Of The Effects Of Desertification In Yobe State, Nigeria, Jibril Musa Phd
Confluence Journal Environmental Studies (CJES), Kogi State University, Nigeria
Desertification is one of the most serious environmental and socio-economic problems of our time. Desertification describes circumstances of land degradation in arid, semi-arid and dry sub-humid regions resulting from the climatic variation and human activities. The fundamental goal of this thesis was to assess the effects of desertification in Yobe State, Nigeria. The present threat of desertification in the sahel has reached an alarming stage where crops cultivation and animal rearing/grazing are no more productive, soil has lost its nutrient/fertility, various infrastructure had given way because of windstorm from the neighbouring Niger Republic and sand dunes had taken over. The …
Terrain Constrained Stereo Correspondence, Gabrielle Inglis, Chris Roman
Terrain Constrained Stereo Correspondence, Gabrielle Inglis, Chris Roman
Christopher N. Roman
There is a persistent need in the oceanographic community for accurate three dimensional reconstructions of seafloor structures. To meet this need underwater mapping techniques have expanded to include the use of stereo vision and high frequency multibeam sonar for mapping scenes 10's to 100's of square meters in size. Both techniques have relative advantages and disadvantages that depend on the task at hand and the desired accuracy. In this paper, we develop a method to constrain the often problematic stereo correspondence search to small sections of the image that correspond to estimated ranges along the epipolar lines calculated from coregistered …
Application Of Structured Light Imaging For High Resolution Mapping Of Underwater Archaeological Sites, Chris Roman, Gabrielle Inglis, James Rutter
Application Of Structured Light Imaging For High Resolution Mapping Of Underwater Archaeological Sites, Chris Roman, Gabrielle Inglis, James Rutter
Christopher N. Roman
This paper presents results from recent work using structured light laser profile imaging to create high resolution bathymetric maps of underwater archaeological sites. Documenting the texture and structure of submerged sites is a difficult task and many applicable acoustic and photographic mapping techniques have recently emerged. This effort was completed to evaluate laser profile imaging in comparison to stereo imaging and high frequency multibeam mapping. A ROV mounted camera and inclined 532 nm sheet laser were used to create profiles of the bottom that were then merged into maps using platform navigation data. These initial results show very promising resolution …
Electrical Tuning Of Magnetism In Fe₃O₄/Pzn–Pt Multiferroic Heterostructures Derived By Reactive Magnetron Sputtering, Ming Liu, Ogheneyunume Obi, Zhuhua Cai, Jing Lou, Guomin Yang, Katherine S. Ziemer, Nian X. Sun
Electrical Tuning Of Magnetism In Fe₃O₄/Pzn–Pt Multiferroic Heterostructures Derived By Reactive Magnetron Sputtering, Ming Liu, Ogheneyunume Obi, Zhuhua Cai, Jing Lou, Guomin Yang, Katherine S. Ziemer, Nian X. Sun
Dr Guomin Yang
Strong magnetoelectric (ME) coupling was demonstrated in Fe₃O₄/PZN–PT (lead zinc niobate–lead titanate) multiferroic heterostructures obtained through a sputter deposition process. The dependence of the magnetic anisotropy on the electric field (E-field) is theoretically predicted and experimentally observed by ferromagnetic resonance spectroscopy. A large tunable in-plane magnetic anisotropy of up to 600 Oe, and tunable out-of-plane anisotropy of up to 400 Oe were observed in the Fe₃O₄/PZN–PT multiferroic heterostructures, corresponding to a large ME coefficient of 100 Oe cm/kV in plane and 68 Oe cm/kV out of plane, which match well with predicted results. In addition, the electric field manipulation of …