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× 106 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.
@article{arxiv.1406.2028,
title = {Perpendicular magnetic anisotropy and magnetization process in CoFeB/Pd multilayer films},
author = {Duc-The Ngo and Duy-Truong Quach and Quang-Hung Tran and Kristian Mølhave and The-Long Phan and Dong-Hyun Kim},
journal= {arXiv preprint arXiv:1406.2028},
year = {2014}
}