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University of Nebraska - Lincoln

Si-Hwang Liou Publications

2005

Articles 1 - 3 of 3

Full-Text Articles in Physics

Magnetization Reversal Of Fe Films On Ag Submicrometer Pyramidal Islands, Chin-Chung Yu, Yeong-Der Yao, Sy_Hwang Liou Oct 2005

Magnetization Reversal Of Fe Films On Ag Submicrometer Pyramidal Islands, Chin-Chung Yu, Yeong-Der Yao, Sy_Hwang Liou

Si-Hwang Liou Publications

Ag submicrometer pyramidal islands with a (100) truncated top and four (111) sidewalls were successfully fabricated on Si(100) substrates at a deposition temperature of 500/spl deg/C. The magnetization reversal of 30 nm thick Fe films grown on Ag pyramidal islands was studied by magnetic force microscopy. The magnetization reversal of Fe films was first started at the sidewalls of pyramidal islands. Then, the formation and propagation of wall-like structures were observed under a higher external magnetic field, namely 95 Oe. The magnetic domain images indicated that the Fe films grown on the sidewalls of pyramidal islands and ...


Magnetic Properties And L10 Phase Formation Of Fept Films Prepared By High Current-Density Ion-Beam Irradiation And Rapid Thermal Annealing Methods, T. Yokota, M.L. Yan, Yinfan Xu, L. Gao, R. Zhang, Leighann Nicholl, Lu Yuan, Ralph Skomski, David J. Sellmyer, Sy_Hwang Liou, Chih-Huang Lai, Cheng-Han Yang, Sheng-Huang Huang May 2005

Magnetic Properties And L10 Phase Formation Of Fept Films Prepared By High Current-Density Ion-Beam Irradiation And Rapid Thermal Annealing Methods, T. Yokota, M.L. Yan, Yinfan Xu, L. Gao, R. Zhang, Leighann Nicholl, Lu Yuan, Ralph Skomski, David J. Sellmyer, Sy_Hwang Liou, Chih-Huang Lai, Cheng-Han Yang, Sheng-Huang Huang

Si-Hwang Liou Publications

We investigated magnetic properties and L10 phase formation of FePt films by rapid thermal annealing (RTA) and high current-density ion-beam irradiation. The sample prepared by RTA at 550 °C has (001) texture and strong magnetic perpendicular anisotropy with Hc equal to 6 kOe. The sample irradiated at 5.04 µA/cm2 has Hc equal to 10 kOe but has isotropic magnetic properties due to the (111) texture. The magnetic correlation length of the ion-irradiated sample was about twice as large as that of the RTA sample. This may be due to the inhomogeneity of ...


The Perpendicular Magnetic Anisotropy Of Copt/Au Multilayer Films, T. Yokota, Lei Gao, R. Zhang, Leighann Nicholl, M. L. Yan, David J. Sellmyer, Sy-Hwang Liou Feb 2005

The Perpendicular Magnetic Anisotropy Of Copt/Au Multilayer Films, T. Yokota, Lei Gao, R. Zhang, Leighann Nicholl, M. L. Yan, David J. Sellmyer, Sy-Hwang Liou

Si-Hwang Liou Publications

We have studied the magnetic properties of Au (2 nm)/Co50Pt50 (3 nm)/Au (2 nm) multilayer films prepared on amorphous Al2O3/Si and (0 0 1) MgO substrates. The as-deposited films on both substrates are magnetically soft with an FCC structure and exhibit a perpendicular anisotropy. After annealing at 500 °C, the sample on the Al2O3/Si substrate has become magnetically isotropic but the sample on the MgO substrate still has perpendicular anisotropy with FCT structure. This film deposited on the MgO substrate did not show a strong perpendicular anisotropy ...