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CoFe/Cu/CoFe/IrMn 스핀밸브 박막의 자유층 두께 감소에 따른 연자성 자기저항 특성 연구
최종구(Jong-Gu Choi),고인숙(In-Suk Go),공유미(Yu-Mi Gong),김민호(Min-Ho Kim),박영석(Young-Suk Park),황도근(Do-Guwn Hwang),이상석(Sang-Suk Lee) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.2
Interlayer coupling field, coercivity, magnetoresitance ratio, and magnetic sensitivity depending on the thickness of free CoFe layer for the CoFe/Cu/CoFe/IrMn multilayer are investigated. In case of CoFe layer of 30 A thickness for the CoFe(t)/Cu(25 A)/ CoFe(60 A)/IrMn(80 A) multilayer with ferromagnet/non-magnet/ferromagnet structure induced by IrMn layer, the lowest coercivity and the highest magnetic sensitivity, which is contained soft magnetic property, are observed. On the other side, in case of CoFe layer of 90 A thickness, there are the highest coercivity and the lowest magnetic sensitivity. The fabricated CoFe(30 A)/Cu(25 A)/ CoFe(60 A)]/IrMn(80 A) spin valve device with 2 × 8 ㎛² patterning size are measured by two probe method, which is selected the sensing current as the longitudinal direction and the easy axis as the transversal direction. The measuring magntoresistance ratio and magnetic sensitivity of GMR-SV device having the soft magnetic property are 3.0% and 0.3 %/Oe, respectively.