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標題: Antiferromagnetic layer structure effects on exchange coupling strength in ion-beam deposited Ni80Fe20/cobalt oxide bilayers
作者: Lin, K.W.
Lin, F.T.
Tzeng, Y.M.
關鍵字: exchange coupling;exchange bias;MRAM;NiFe/cobalt oxide bilayers;ion-beam deposition technique;magnetic-properties;bias
Project: Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers
期刊/報告no:: Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers, Volume 44, Issue 6A, Page(s) 3932-3935.
A series of Ni80Fe20/Cobalt oxide bilayers were prepared by a dual ion-beam deposition technique that produced a layer composition that varied from rock-salt COO (a = 4.27 angstrom) to spinel Co3O4 (a = 8.21 angstrom) with increasing O-2 content in the assist beam. Each polycrystalline layer (similar to 20 nm) exhibited a columnar structure perpendicular to the film surface. A strong temperature dependence of coercivity H-c and exchange bias field He, was found in these Ni80Fe20/cobalt oxide bilayers. At T = 10 K, films prepared with 34% O-2 in the assist beam exhibited an exchange shift H-ex similar to -200 Oe that persisted at temperatures higher than 30 K. The variations in H-c and H-ex as a function of %O-2 are related to the interfacial roughness and magnetic state of COO or Co3O4. The transition temperature of Co3O4 has increased above the bulk value via exchange coupling with the permalloy.
ISSN: 0021-4922
DOI: 10.1143/jjap.44.3932
Appears in Collections:期刊論文

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