• Title/Summary/Keyword: 합성형 스핀밸브

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BIAS POINT CONTROL IN SYNTHETIC ANTIFERROMAGNET-BASED SPIN-VALVES

  • Park, J.S.;Lee, S.R.;Kim, Y. K.
    • Proceedings of the Korean Magnestics Society Conference
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    • 2002.12a
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    • pp.52-53
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    • 2002

  • 스핀밸브 구조는 현재 고기록밀도 자기저장 분야에서 그 응용범위가 넓다. 이런 고기록밀도를 달성하기 위해서는 자기저항곡선의 비대칭성 문제가 중요하다. 그러므로 비대칭성 문제를 해결하여 센서의 민감도를 높이기 위해서는 고정층에서 나오는 정자기장을 제어하는 것이 필요하다. 이런 문제를 해결하기 위해 IBM에서 최초로 합성형 스핀밸브 구조가 도입하였다 [1]. 이런 합성형 스핀밸브는 기존의 스핀밸브에 비해 열적으로나 또는 자기적으로 매우 안정한 장점을 가지고 있다. (중략)

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Magnetoresistance Properties in Synthetic CoFe/Ru/CoFe/FeMn Spin Valves with Different Pinned Layer Thicknesses (합성형 반강자성체인 CoFe/Ru/CoFe/FeMn에서 고정층의 두께 차이에 따른 스핀 밸브 구호의 자기저항 특성)

  • 김광윤
    • Journal of the Korean Magnetics Society
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    • v.11 no.5
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    • pp.211-216
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    • 2001

  • Top synthetic spin valves wi th structure Ta/NiFe/CoFe/Cu/CoFe(Pl)/Ru/CoFe(P2)/FeMn/Ta on Si (100) substrate with SiO$_2$ of 1500 were prepared by dc magnetron sputtering system. We have changed only the thickness of the free layer and the thickness difference (Pl-P2) in the two ferromagnetic layers separated by Ru, and investigated the effect of magnetic film thickness on the GMR properties and the interlayer coupling field in a spin valve with a synthetic antiferromagnet. As thickness difference of pinned layer was decreased from +25 to -25 , MR ratio was decreased gradually. However, there was a dip zone indicating a big change of MR ratio around Pl = P2, which can be due to the large canting of pinned layers. The modified Neel model was suggested for the top synthetic spin valve to explain the interlayer coupling field according to the thickness change of ferromagnetic layers. The interlayer coupling field was decreased due to the magnetostatic coupling (orange peel coupling) as suggested by model. However, the interlayer coupling field was not explained at the dip zone by the modified Neel model. The deviation of modified Neel model at the dip zone could be due to the largely canting of the pinned layers as well, which depends on different thickness in synthetic antiferromagnetic structure.

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