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arXiv · 1406.2028

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

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

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Duc-The Ngo, Duy-Truong Quach, Quang-Hung Tran, Kristian Mølhave, The-Long Phan, Dong-Hyun Kim. 2014-06-08. Perpendicular magnetic anisotropy and magnetization process in CoFeB/Pd multilayer films. https://doi.org/10.1088/0022-3727/47/44/445001

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