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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.
Goto, M.,Teshima, N.,Han, S.Z.,Euh, K.,Yakushiji, T.,Kim, S.S.,Lee, J. Pergamon Press ; Elsevier Science Ltd 2013 Engineering fracture mechanics Vol.110 No.-
The effects of post equal channel angular pressing annealing on microstructure and high-cycle fatigue behavior of ultrafine-grained copper were examined. Grains with sizes up to a few tens of micrometers surrounded by fine grains were formed after the annealing as a result of discontinuous recrystallization. The fatigue life of annealed samples in the short- and medium-life fields was found to decrease, while in the long-life field, the fatigue strength at 3x10<SUP>7</SUP> cycles was about 9% greater than that of ultrafine-grained copper without annealing. Long-term stressing for as-received ultrafine-grained samples produced large grains over 100μm as a result of dynamic recovery and recrystallization. For annealed samples, there were no significant differences in grain sizes between pre- and post-stressing, showing the higher stability of bimodal microstructure. This stability was related to the slightly increased fatigue strength in long life fields. The effect of bimodal microstructure on the growth behavior of small surface-cracks was discussed.
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.