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Articles 1 - 4 of 4
Full-Text Articles in Physics
Bi-Relaxation Behaviors In Epitaxial Multiferroic Double-Perovskite Bife0.5mn0.5o3/Caruo3 Heterostructures, Chew Khian Hooi, Zhan Q., Jiang Y., Miao J., Zhang X.
Bi-Relaxation Behaviors In Epitaxial Multiferroic Double-Perovskite Bife0.5mn0.5o3/Caruo3 Heterostructures, Chew Khian Hooi, Zhan Q., Jiang Y., Miao J., Zhang X.
Chew Khian Hooi
Multiferroic double-perovskite BiFe0.5Mn0.5O3 thin film heterostructures were epitaxially grown on CaRuO3-buffered (001) SrTiO3 by pulse laser deposition. Typical Vogel-Fulcher relaxorlike dielectric and magnetic susceptibilities were observed, implying the film exhibits the properties of an electric relaxor and a magnetic relaxor. Polarization and size of polar nanoregions (PNRs) were determined by fitting the dielectric constant to a multi-polarization mechanism model. It was found that PNRs of 7-11 nm decrease from 0.67 mu C/cm(2) to 0.11 mu C/cm(2), as the temperature increases from 380 K to 460 K. A weak ferromagnetism was observed via magnetic hysteresis loops up to 300 K. (C) …
Defects Control For Improved Electrical Properties In (Ba0.8sr0.2)(Zr0.2ti0.8)O-3 Films By Co Acceptor Doping, Chew Khian Hooi, Jiang Y., Miao J.
Defects Control For Improved Electrical Properties In (Ba0.8sr0.2)(Zr0.2ti0.8)O-3 Films By Co Acceptor Doping, Chew Khian Hooi, Jiang Y., Miao J.
Chew Khian Hooi
(Ba0.8Sr0.2)(Zr0.2Ti0.8)O-3 (BSZT) films were grown on La0.5Sr0.5CoO3 buffered (001) SrTiO3 substrates by pulsed laser deposition. Effects of Co doping on electrical properties of the films were investigated to establish material design through defects control. The doping led to a significant improvement in the electrical properties with reduction in leakage current and dielectric loss. In addition, the dielectric tunability and figure of merit were enhanced, implying that Co-doped BSZT films are promising materials for tunable microware applications. Our detail studies suggest that the improved electrical properties of Co-doped BSZT films are closely related to defect concentrations in the films. (C) 2011 …
Improvement Of Ferroelectric Fatigue Endurance In Multiferroic (Ba(0.5)Sr(0.5))Tio(3)/(Bi(1.05)La(0.05))Feo(3)/(Ba(0.5)Sr(0.5))Tio(3) Sandwich Structures, Chew Khian Hooi, Miao J., Zhang B. P., Wang Y.
Improvement Of Ferroelectric Fatigue Endurance In Multiferroic (Ba(0.5)Sr(0.5))Tio(3)/(Bi(1.05)La(0.05))Feo(3)/(Ba(0.5)Sr(0.5))Tio(3) Sandwich Structures, Chew Khian Hooi, Miao J., Zhang B. P., Wang Y.
Chew Khian Hooi
We report the improved ferroelectric properties in dielectric/multiferroic/dielectric sandwich structures composed of Ba(0.5)Sr(0.5)TiO(3) (BST) and Bi(1.05)La(0.05)FeO(3) (BLF). Compared with the single BLF film, the trilayer structures exhibit a lower dielectric loss and weaker frequency dependence of dielectric properties. At room temperature, the remnant polarization and saturation polarization of the trilayer structures are 34.3 and 46.9 mu C/cm(2), respectively. More interestingly, the polarization of BST/BLF/BST trilayer exhibits a fatigue-free characteristic of up to 10(9) switching cycles. Applying Dawber's model, the concentration of oxygen vacancies and barrier energy of oxygen vacancies migration in BST/BLF/BST trilayer are calculated as 6.1x10(17) cm(-3) and 1.33 …
Surface Aided Polarization Reversal In Small Ferroelectric Particles, Chew Khian Hooi, Shin F. G., Chan H. L. W., Osman J., Stamps R. L., Tilley D. R.
Surface Aided Polarization Reversal In Small Ferroelectric Particles, Chew Khian Hooi, Shin F. G., Chan H. L. W., Osman J., Stamps R. L., Tilley D. R.
Chew Khian Hooi
Polarization reversal in ferroelectric particles driven by a pulsed electric field is examined theoretically using Landau-Devonshire-Khalatnikov theory. A significant reduction in reversal times is shown to be possible if certain surface properties and size criteria are met. The surface properties are also shown to control the magnitude of the applied field needed for irreversible switching. An interesting signature of surface effects is found in the switching current. The theory predicts that the switching current for small ferroelectric particles can exhibit double peaks as a function of time. The size and relative times of the peaks provide specific information on the …