• Title/Summary/Keyword: 거대자기저항

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Giant Magnetoresistance Behavior and the Effect of Ferromagnetic Layer on the Co-Ag Nano-granular Alloy Films (Co - Ag 합금박막의 거대자기저항 및 강자성 상하지층의 효과)

  • 김용혁;이성래
    • Journal of the Korean Magnetics Society
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    • v.7 no.1
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    • pp.31-37
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    • 1997

  • The magnetoresistance and the saturation field behavior of the Co-Ag nano granular films as a function of the composition and the ferromagnetic underlayer and overlayermaterials were investigated. The maximum magnetoresistance of 23% and the saturation field of 2.3 kOe at room temperature were obtained in the as-deposited 3000$\AA$ $Co_{30}Ag_{70}$ single alloy films. The magnetoresistance and the saturation field of 100$\AA$ $Co_{30}Ag-{70}$ alloy film were 3.65 % and 3.0 kOe respectively. Those of the sandwiched films with 200$\AA$ Fe were 3.3 % and 1.23 kOe respectively. The saturation field of the sandwiched alloy films could be reduced by the exchange coupling between the ferromagnetic layers and the alloy layer. The effective depth of the exchange coupling was approximately 150$\AA$ in each Fe layer. Among the Fe, Co, and FeNi, the most effective materials to reduce the saturation field of the sandwiched alloy films was Fe.

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A study on the magnetic properties and microstructure of spin-valve type multilayer for giant magnetoresistance (스핀밸브형 거대자기저항 다층박막의 자기적 특성 및 미세구조에 관한 연구)

  • 노재철;이두현;이명신;윤대호;서수정
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.8 no.1
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    • pp.73-82
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    • 1998

  • The exchange anisotropy is the unidirectional magnetic anisotropy which comes from exchange interaction between antiferromagnetic layer and ferromagnetic layer. The application of this phenomenon to MR read head and spin-valve type GMR (Giant Magnetoresistance) head has been studied extensively. In our study, we intended to apply exchange anisotropy of NiO/NiFe bilayer to spin-valve type GMR element. Above all, we studied the exchange anisotropy of NiO/NiFe bilayer, and focused especially on the effect of NiO deposition condition. And we found that Ar pressure during NiO deposition was crucial factor for the exchange anisotropy of NiO/NiFe bilayer. The lower the Ar pressure is, the better the characteristics of exhange anisotropy is. Then, we applied this optimum condition of NiO/NiFe bilayer to spin-valve type GMR element. Finally we got spin-valve type GMR element which had 3.6 % MR ratio, 16 Oe switching field, and 0.25 %/Oe sensitivity.

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Effects of NiFeCo of NiFe Insertion Layers on the Giant Magnetoresistance Behavior of Ni/Cu Artificial Superlattice (Ni/Cu 인공초격자에서 NiFeCo 및 NiFe 계면 삽입층이 거대자기저항 거동에 미치는 영향)

  • 송용진;주승기
    • Journal of the Korean Magnetics Society
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    • v.5 no.6
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    • pp.963-967
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    • 1995

  • Ultra thin layers of NiFeCo or NiFe were inserted at the interfaces of Ni and Cu to form a multilayer structure. In case of inserting a NiFe layer, the magnetoresistance was about 6%, the saturation magnetic field was 50 Oe and the hysteresis of R-H (resistance-magnetic field) was very small. In case of inserting a NiFeCo layer, the magnetoresistance increased to about 7% but the saturation magnetic field and hysteresis were also increased. The increase of the output under biased magnetic field was much larger in case of inserting a NiFe layer because of relatively smaller hysteresis in R-H behavior.

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