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Full-Text Articles in Physics
Diminishing Sign Anomaly And Scaling Behavior Of The Mixed-State Hall Resistivity In Tl2Ba2Ca2Cu3O10 Films Containing Columnar Defects, R.C. Budhani, Sy_Hwang Liou, Z.X. Cai
Diminishing Sign Anomaly And Scaling Behavior Of The Mixed-State Hall Resistivity In Tl2Ba2Ca2Cu3O10 Films Containing Columnar Defects, R.C. Budhani, Sy_Hwang Liou, Z.X. Cai
Sy-Hwang Liou Publications
The issues of sign reversal of the Hall voltage and scaling between longitudinal (ρχχ) and Hall (ρχy) resistivities are studied in Tl2Ba2Ca2Cu3O10 films in which the vortex dynamics is drastically changed by flux pinning at heavy-ion-irradiation–induced linear defects. While the sign anomaly diminishes with increasing defect concentration, the power law ρχy∼ρχχ β , β=1.85±0.1, holds even after irradiation. This result shows that the scaling is a universal feature of the mixed state in this system. The sign anomaly, on the other hand, is not …
Magnetic Properties Of Epitaxial Single Crystal Ultrathin Fe3Si Films On Gaas (001), Sy_Hwang Liou, S.S. Malhotra, J.X. Shen, M. Hong, J. Kwo, H.S. Chen, J.P. Mannaerts
Magnetic Properties Of Epitaxial Single Crystal Ultrathin Fe3Si Films On Gaas (001), Sy_Hwang Liou, S.S. Malhotra, J.X. Shen, M. Hong, J. Kwo, H.S. Chen, J.P. Mannaerts
Sy-Hwang Liou Publications
Magnetic properties of Fe3Si films with thickness from 2 to 210 monolayers (ML) epitaxially grown on GaAs (001) were studied using a superconducting quantum interference device and alternating gradient force magnetometers. Growth of these single-crystal intermetallic compound films were carried out in a multichamber molecular beam epitaxy (MBE) system. The samples were covered in situ with Au 50 Å thick to prevent oxidation when the samples were removed from the MBE chamber. All the films are ferromagnetic even for samples as thin as 2 ML. The easy magnetization direction of the films is parallel to the film surface. …
Interface Magnetism And Superparamagnetism Of Co/Cu Multilayers, Z.S. Shan, S. Nafis, John A. Woollam, Sy_Hwang Liou, David J. Sellmyer
Interface Magnetism And Superparamagnetism Of Co/Cu Multilayers, Z.S. Shan, S. Nafis, John A. Woollam, Sy_Hwang Liou, David J. Sellmyer
Sy-Hwang Liou Publications
The magnetic properties of Co/Cu multilayers were investigated from 5 to 380 K and analyzed in terms of the interface magnetism and mean-field model. The interface, which is about 1.2 Å thick, is nonmagnetic at room temperature and becomes magnetic at 5 K with the average magnetization of 40% of the pure Co magnetization. The samples of X Å Co/10 Å Cu behaved superparamagnetically as X ranged from 4 to 6.5 Å and did not show superparamagnetic behavior for thinner or thicker Co layer thickness.
Low Temperature Phase Formation Of Tl-Based Superconducting Thin Films In Reduced Oxygen Atmosphere, C.Y. Wu, F. Foong, Sy_Hwang Liou, J.C. Ho
Low Temperature Phase Formation Of Tl-Based Superconducting Thin Films In Reduced Oxygen Atmosphere, C.Y. Wu, F. Foong, Sy_Hwang Liou, J.C. Ho
Sy-Hwang Liou Publications
Tl-Ba-Cu-Cu-O superconducting thin films were prepared by magnetron sputtering with postannealing in a reduced oxygen atmosphere. Single-phase Tl2Ba2Ca2Cu3Oχ can form on the MgO substrate at 800°C under P(O2)≈0.1 atm. However, the phase formation temperature can be affected by the starting composition of the film. Tl1Ba2 Ca2Cu2Oχ phase can be formed by simply lowering the Tl2O pressure. The thermal stability of Tl1Ba2Ca2Cu3Oχ phase was studied by resistivity measurements at high temperatures.