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D. D. Lam,F. Bonell,S. Miwa,Y. Shiota,K. Yakushiji,H. Kubota,T. Nozaki,A. Fukushima,S. Yuasa,Y. Suzuki 한국자기학회 2013 Journal of Magnetics Vol.18 No.1
The perpendicular magnetic anisotropy of sputtered CoFeB thin films covered by MgO was investigated by vibrating sample magnetometry. Three different CoxFe80-xB₂? alloys were studied. Under out-of plane magnetic field, the saturation field was found to increase with increasing the Co content. The magnetization and interface anisotropy energy were obtained for all samples. Both showed a marked dependence on the MgO overlayer thickness. In addition, their variations were found to be non-monotonous as a function of the Co concentration.
MgO Overlayer Thickness Dependence of Perpendicular Magnetic Anisotropy in CoFeB Thin Films
D. D. Lam,F. Bonell,S. Miwa,Y. Shiota,K. Yakushiji,H. Kubota,T. Nozaki,A. Fukushima,S. Yuasa,Y. Suzuki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
The dependence of the magnetization and perpendicular magnetic anisotropy (PMA) of Ta/CoFeB/MgO/Ta on the thicknesses of the CoFeB layer and the MgO overlayer was investigated by vibrating sample magnetometer. The magnetization is found to be small for samples with a thin MgO overlayer. The PMA strongly depends on the MgO overlayer (hereafter, MgO) thickness and its maximum value of 1.74 erg/cm2 is achieved for a 1.0 nm thick MgO overlayer with annealing at 300 ◦C. The volume anisotropy of the CoFeB layer is found to be independent of the MgO thickness,which suggest that only the interface anisotropy depends on the MgO thickness. The possible mechanisms that may influence the interface magnetization and anisotropy are discussed herein.