Abstract
자성-금속-자성 삼층구조로 반강자성 결합 특성을 갖는 박막 재료의 자화 곡선은 두 자성박막 각각의 자화량(<TEX>$M_1$</TEX>, <TEX>$M_2$</TEX>) 변화 특성을 반영한다. 본 연구에서는 반강자성 결합 특성을 갖는 CoB/Ru/CoB 박막 재료의 두 자성 박막의 총자화량(<TEX>$M_{tot}=M_1+M_2$</TEX>)과 상부 단일 박막의 자화량(<TEX>$M_1$</TEX>)의 이론적 값을 Stoner-Wohlfarth 모델로 계산하였다. VSM으로 측정한 총자화량은 자기장의 반전에 따라 가역 특성을 보였으며, CoB/Ru/CoB 재료의 플롭자기장(<TEX>$H_F$</TEX>)은 약 50 Oe였다. 한편 MOKE로 측정한 상부 단일 박막의 자화량(<TEX>$M_1$</TEX>)은 <TEX>$-H_F$</TEX> < H < <TEX>$H_F$</TEX>에서 비가역 자화 반전 특성을 보였다. 이러한 자화 거동 특성은 두 자성 박막에 서로 상호 작용하는 반강자성 결합에 의하여 두 자성 박막 각각의 자화 각도 변화에 기인함을 Stoner-Wohlfarth 모델 계산을 통하여 확인하였다. We have analyzed the magnetization curves measures by using VSM and MOKE in synthetic antiferromagnetic coupled CoB/Ru/CoB thin film. The measured results were compared with calculated ones by Stoner-Wohlfarth model based on the magnetization behavior of two ferromagnetic layers (<TEX>$M_1$</TEX>, <TEX>$M_2$</TEX>). The calculated total magnetization (<TEX>$M_{tot}=M_1+M_2$</TEX>) and single layer magnetization(<TEX>$M_1$</TEX>) behaviors were compared with measured results by using VSM and MOKE, respectively. The total magnetization curve (<TEX>$M_{tot}=M_1+M_2$</TEX>) showed reversible magnetization behavior with flopping field of about 50 Oe. While single layer magnetization (<TEX>$M_1$</TEX>) behaviors showed irreversible magnetization behavior in the field range of <TEX>$H_F$</TEX> < H < <TEX>$H_F$</TEX>. These magnetization behaviors were explained by the angle difference between magnetization directions of two ferromagnetic layers in SAF sample.
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