• Title/Summary/Keyword: spin valves

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The Effects of Deposition Rates on Exchange Coupling and Magnetoresistance in NiO Spin-Valve Films

  • D. G. Hwang;Park, C. M.;Lee, S. S.;Lee, K. A.
    • Journal of Magnetics
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    • v.2 no.4
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    • pp.143-146
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    • 1997

  • The effects of deposition rate on exchange coupling field Hex and coercive field Hc in NiO spin-valves are discussed. The Hex and Hc increased with deposition rate of NiO film. The rms roughnesses of the NiO deposited at 6 ${\AA}$/min (NiO-Low) and 30${\AA}$/min (NiO-High) were almost similar, however, the short-range roughness increased with the deposition rate. The Hex, Hc and surface morphologies for the modulated NiO spin-valve films such as NiO-Low\NiO-High\NiO-Low and NiO-High\NiO-Low were investigated.

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Thermal Stability and Domain Structure in Spin Valve Films with IrMn Exchange Biased Layers (IrMn 교환결합층을 갖는 스핀밸브막에서의 열적안정성과 자구구조 관찰)

  • Lee Byeong-Seon;Jung Jung-Gyu;Lee Chang-Gyu;Koo Bon-Heun;Hayashi Yasunori
    • Korean Journal of Materials Research
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    • v.14 no.2
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    • pp.94-100
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    • 2004

  • We have investigated the magnetic domain structure and the thermal stability of magnetotransport properties of IrMn biased spin-valves containing Co, CoFe and NiFe. The magnetic domain structures were imaged using a magneto-optical indicator film(MOIF) technique. To investigate the thermal stability, magnetoresistance(MR) was measured at annealing temperature(TANN) and room temperature($T_{RT}$) followed by the annealing. Domain imaging reveal that the increase of annealing temperature led to changes in the exchange coupling between the two ferromagnet(FM) layers through nonmagnetic layer rather than between FM and antiferromagnet. unlike the NiFe biased IrMn spin valve with large domains, MOIF pictures of Co and CoFe biased IrMn spin valve structures show the formation of many small microdomains. The magnetic structure, as revealed by the domain images, appeared unchanged while the MR dropped dramatically. From the combined giant magnetoresistance(GMR) and MOIF results, it was apparent that the decrease of MR ratio was not related to the spin valve magnetic structure up to about $350^{\circ}C$($T_{RT}$ ).

  • https://doi.org/10.3740/MRSK.2004.14.2.094 인용 PDF KSCI