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비정질 강자성체 CoSiB/Pd 다층박막의 두께에 따른 수직자기이방성 변화
임혜인(H. I. Yim) 한국자기학회 2013 韓國磁氣學會誌 Vol.23 No.4
Perpendicular magnetic anisotropy (PMA) is the phenomenon of magnetic thin film which is preferentially magnetized in a direction perpendicular to the film’s plane. Amorphous multilayer with PMA has been studied as the good candidate to realization of high density STT-MRAM (Spin Transfer Torque-Magnetic Random Access Memory). The current issue of high density STT-MRAM is a decrease in the switching current of the device and an application of amorphous materials which are most suitable devices. The amorphous ferromagnetic material has low saturated magnetization, low coercivity and high thermal stability. In this study, we presented amorphous ferromagnetic multilayer that consists of an amorphous alloy CoSiB and a nonmagnetic material Pd. We investigated the change of PMA of the [CoSiB t<SUB>CoSiB</SUB>/Pd 1.3 nm]? multilayer (t<SUB>CoSiB</SUB> = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 nm, and t<SUB>Pd</SUB>= 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 nm) and [CoSiB 0.3 nm/Pd 1.3 nm]n multilayer (n = 3, 5, 7, 9, 11, 13). This multilayer is measured by VSM (Vibrating Sample Magnetometer) and analyzed magnetic properties like a coercivity (Hc) and a magnetization (Ms). The coercivity in the [CoSiB t<SUB>CoSiB</SUB> nm/Pd 1.3 nm]? multi-layers increased with increasing t<SUB>CoSiB</SUB> to reach a maximum at t<SUB>CoSiB</SUB> = 0.3 nm and then decreased for t<SUB>CoSiB</SUB>> 0.3 nm. The lowest saturated magnetization of 0.26 emu/cm³ was obtained in the [CoSiB 0.3 nm/Pd 1.3 nm]₃ multilayer whereas the highest coercivity of 0.26 kOe was obtained in the [CoSiB 0.3 nm/Pd 1.3 nm]? mutilayer. Additional Pd layers did not contribute to the perpendicular magnetic anisotropy. The single domain structure evolved in to a striped multi-domain structure as the bilayer repetition number n was increased above 7 after which (n > 7) the hysteresis loops had a bow-tie shapes.
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박막수직방향에서 면방향으로 회전하는 인가자기장에 대한 다층박막 [Pt/Co]<SUB>N</SUB>-IrMn의 교환바이어스의 각도의존특성
김순섭(S. S. Kim),임혜인(H. I. Yim),이장로(J. R. Rhee),이상석(S. S. Lee),황도근(D. G. Hwang) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.4
The angular dependence of the exchange bias (Hex) and coercivity (Hc) in multilayer [Pt/Co]N-IrMn with applied measuring field rotated toward in-plane at angle θ from perpendicular-to-plane, has been measured. Multilayer films consisting of Si/SiO₂/Ta(50)/Pt(4)/[Pt(15)/Co(t<SUB>Co</SUB>)]N/IrMn(50)/Ta(50) (in A) were prepared by magnetron sputtering under typical base pressure below 2×10<SUP>?8</SUP> Torr at room temperature. Magnetization measurements were performed on a vibrating sample magnetometer and extraordinary Hall voltage measurement systems after cooling from 550 K under a field of 2 kOe applied along the perpendicular to film direction. The hysteresis loop shifts from the origin not only along the field axis but also along the magnetization axis. Hex and Hc show a 1/cosθ and 1/|cosθ| dependence on the angle (θ) between the applied measuring field and the perpendicular-film direction, respectively. This 1/cosθ dependence can be accounted for by considering the angular dependence of strong out-of-plane magnetic anisotropy introduced during the field cooling.
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