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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.
Ni80Fe20 / [Ir₂₂Mn78 - Mn] / Co75Fe25 다층박막에서 Mn 함유량에 의존하는 교환결합력과 열적안정성
김보경(B. K. Kim),이진용(J. Y. Lee),김순섭(S. S. Kim),황도근(D. G. Hwang),이상석(S. S. Lee),황재연(J. Y. Hwang),김미양(M. Y. Kim),이장로(J. R. Rhee) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.5
The magnetic and thermal properties of NiFe/[IrMn-Mn]/CoFe with Mn additions have been studied. As-deposited CoFe pinned layers with [IrMn-Mn]layer had dominantly larger exchange biasing field (Hex) and blocking temperature (Tb) than those with pure Ir₂₂Mn_(78) used. The Hex and Tb improved with 76.8-78.1 vol% Mn, but those of the NiFe/IrMn/CoFe dropped considerably with more addition of 0.6 vol % Mn. The average x-ray diffraction peak ratios of fcc [(111)CoFe, NiFe]/(111)IrMn₃ textures for the Mn inserted total vol of 75.5, 77.5, and 79.3% were about 1.4, 0.8, and 0.6, respectively. For the sample without Mn inserted layer, the Hex between IrMn and CoFe layers was almost zero, but it increased to 100 Oe after annealing of 250 ℃. For as-grown two multilayers samples with ultra-thin Mn layers of 77.5 and 78.7 vol %, the Hexs were 259 and 150 Oe, respectively. In case of IrMn with 77.5 vol% Mn, the Hex was increased up to 475 Oe at 350 ℃ but decreased to 200 Oe at 450 ℃, respectively. The magnetic properties and thermal stabilities of NiFe/[IrMn-Mn]/CoFe multilayer were enhanced with Mn additions. In applications where higher Hex and Tb are required, proper contents of Mn can be used.