CoFe/Cu/CoFe/PtMn 다층박막의 자기저항 곡선을 이용한 자기 등방성 특성 분석

다국어 초록 (Multilingual Abstract)

The magnetic isotropy property from the magnetoresistance (MR) curve and magnetization (MH) loop for the PtMn based spin valve (SV) multilayer films fabricated with different the bottom structure after post-annealing treatment was investigated. The exchange biased coupling field (H<SUB>ex</SUB>), coercivity (H<SUB>c</SUB>), and MR ratio of Glass/Ta(10 ㎚)/CoFe(6 ㎚)/Cu(2.5 ㎚)/CoFe(3 ㎚)/Ta(4 ㎚) SV multilayer film without antiferromagnetic PtMn layer are 0 Oe, 25 Oe, and 3.3 %, respectively. MR curve for the Glass/Ta(10 ㎚)/CoFe(6 ㎚)/Cu(2.5 ㎚)/CoFe(3 ㎚)/PtMn(6 ㎚)/Ta(4 ㎚) SV multilayer film showed H<SUB>ex</SUB> = 2 Oe, H<SUB>c</SUB> = 316 Oe, and MR (%) = 4.4 % with one butterfly MR curve having by the effect of antiferromagnetic PtMn layer. MR curve for the dualtype Glass/Ta(10 ㎚)/CoFe(6 ㎚)/Cu(2.5 ㎚)/CoFe(3 ㎚)/PtMn(6 ㎚)/CoFe(3 ㎚)/Cu(2.5 ㎚)/CoFe(6 ㎚)/Ta(4 ㎚) SV multilayer film showed H<SUB>c</SUB> = 37.5 Oe and 386 Oe, MR = 3.5 % and 6.5 % with two butterfly MR curves and square-like hysteresis MH loops. The anisotropy property in CoFe spin valve-PtMn multilayer is neglected by the effects of a very small value of H<SUB>ex</SUB> and a very slightly shape magnetic anisotropy. This result is possible to explain the effect of magnetization configuration spin array of the bottom SV film and the top SV film of PtMn layer.

참고문헌 (Reference)

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