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Your search keyword '"Quach, Duy-Truong"' showing total 18 results
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18 results on '"Quach, Duy-Truong"'

3. Perpendicular magnetic anisotropy and magnetization process in CoFeB/Pd multilayer films

Author

Ngo, Duc-The, Quach, Duy-Truong, Tran, Quang-Hung, Mølhave, Kristian, Phan, The-Long, and Kim, Dong-Hyun

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, 75.30.Gw, 75.60.Ch, 75.60.Jk, 75.70.Cn, 75.70.Kw, 75.70.Rf, 75.78.Fg
Abstract

Perpendicular magnetic anisotropy (PMA) and dynamic magnetization reversal process in [CoFeB $t$ nm/Pd 1.0 nm]$_n$ ($t$ = 0.4, 0.6, 0.8, 1.0, and 1.2 nm; $n$ = 2 - 20) multilayer films have been studied by means of magnetic hysteresis and Kerr effect measurements. Strong and controllable PMA with an effective uniaxial anisotropy up to 7.7$\times$ 10$^6$ J.m$^{-3}$ and a saturation magnetization as low as 200 emu/cc are achieved. Surface/interfacial anisotropy of CoFeB/Pd interfaces, the main contribution to the PMA, is separated from the effective uniaxial anisotropy of the films, and appears to increase with the number of the CoFeB/Pd bilayers. Observation of the magnetic domains during a magnetization reversal process using polar magneto-optical Kerr microscopy shows the detailed behavior of nucleation and displacement of the domain walls., Comment: 18 pages, 5 figures, original research article

Published
2014
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18. Investigation of Microscopic Demagnetization Process Using Magneto-Optical Microscopy.

Author

Quach, Duy-Truong, Lee, Sang-Hyuk, and Kim, Dong-Hyun

Subjects
*DEMAGNETIZATION, *MAGNETOOPTICS, *FARADAY effect, *PLATINUM compounds, *MULTILAYERS, *MAGNETIC force microscopy
Abstract

Detailed demagnetization process depending on various external field profiles has been investigated using a magneto-optical Kerr/Faraday microscopy for a Co/Pt multilayer film with a perpendicular magnetic anisotropy. By quantitatively analyzing local magnetic domain structures, we propose that it is possible to define a parameter $\eta$ , which represents how well the demagnetization has been carried out microscopically. The degree of demagnetization $\eta$ , defined by a ratio between the final demagnetized image intensity and saturated image intensity, has been experimentally found to significantly reflect the microscopic demagnetization behavior. Dependences of $\eta$ on the maximum amplitude, decreased step size, and effective sweeping rate of alternating demagnetizing field have been systematically investigated together with a direct microscopic observation of magnetic domain structures. [ABSTRACT FROM AUTHOR]

Published
2014
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