• Title/Summary/Keyword: spin valves

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Giant Magnetoresistance of Antiferromagnetic Cr-Al based Multilayer Spin-Valve with Anti-Corrosion and Thermal Stability (내열 내식용 Cr-Al반강자성계 스핀밸브막의 거대자기저항 효과)

  • 김병수;이성훈;이찬규
    • Journal of the Korean Magnetics Society
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    • v.8 no.6
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    • pp.362-368
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    • 1998

  • The magnetic properties, thermal stability and anti-corrosion properties of $Cr_86Al_14$ spin valves multilayers were studied. It was found that the magnetic properties of $Cr_86Al_14$ spin valves depend on the thickness of antiferromagnetic, ferromagnetic and non-ferromagnetic layers. Exchange coupled field ($H_{ex}$) and magnetoresistance ratio (%) showed the largest value of 20 Oe, 2 % in $glass/Cr_{86}Al_{14}(600 $\AA$)/Ni_{81}Fe_{19}(50$\AA$)/Cu(40 $\AA$)/Ni_{81}Fe_{19}(40 $\AA$)$ spin valves. The $H_{ex}$ MR ratios (%) of CrAl and FeMn spin valves were decreased with increasing annealing temperatures and were lost at 150 $^{\circ}C$, 250 $^{\circ}C$ respectively. Based on these result, it was elucidated that CrAl is more thermally stable than FeMn. It was also shown that there was no change of $H_{ex}$ MR ratios in CrAl, while FeMn was changed and lost 15 days later in corrosion resistance test under 35 $^{\circ}C$, 90 % humidity condition. FeMn was found to be pitted and peeled off 15 days later by SEM micrographic analysis.

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Magnetoresistance Effect of Ta/NiFe/Cu/Co Pseudo Spin Valve Structure (Ta/NiFe/Cu/Co Pseudo 스핀밸브 구조의 자기저항 효과)

  • Joo, Ho-Wan;Choi, Jin-Hyup;Choi, Sang-Dae;Lee, Ky-Am
    • Journal of the Korean Magnetics Society
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    • v.14 no.1
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    • pp.25-28
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    • 2004

  • The dependence of sensitivity, MR ratio, coercivity (Hc) and switching fields as a function of thickness of each magnetic layers(Co, NiFe and Cu) were investigated in pseudo spin valves with a structure of Ta/NiFe/Cu/Co. As measured results dependence of the thickness of each magnetic layer, we obtained MR ratio of 7.26% for Ta(4 nm)/NiFe(7.5 nm)/Cu(3 nm)/Co(5 nm) pseudo spin valves. Also, we could control properties of magnetoresistance for independent magnetization courses of each magnetic layer. Especially, we found that we could control coercivity as constant MR ratio dependence of Co thickness.

  • https://doi.org/10.4283/JKMS.2004.14.1.025 인용 PDF KSCI