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|標題:||Correlating exchange bias with magnetic anisotropy in ion-beam bombarded NiFe/Mn-oxide bilayers||作者:||Lin, K.W.
van Lierop, J.
|關鍵字:||antiferromagnetic materials;crystal microstructure;exchange;interactions (electron);ferrimagnetic materials;ferromagnetic;materials;interface magnetism;magnetic anisotropy;manganese;compounds;oxidation;Permalloy;transmission electron microscopy;nanoparticles;mn3o4||Project:||Journal of Applied Physics||期刊/報告no：:||Journal of Applied Physics, Volume 104, Issue 12.||摘要:||
The exchange bias field dependence on the Mn-oxide and its microstructure in NiFe/Mn-oxide bilayers was investigated. Transmission electron microscopy results have shown that the bilayer bottom consisted of either alpha-Mn, rocksalt MnO, or a composite of tetragonal Mn(3)O(4)+MnO, depending on the ratio of O(2)/Ar used during dual ion-beam deposition. Magnetometry results at 5 K indicate that the exchange bias field (H(ex)similar to-300 Oe) is largest in a NiFe/Mn (0%O(2)/Ar) bilayer. The MnO formation by in situ Mn oxidation results in a decrease in H(ex) in a NiFe/Mn-oxide (21%O(2)/Ar) bilayer. In contrast, a further increase in the O(2)/Ar ratio during deposition results in larger H(ex) and H(c). This is attributed to the oxidation of MnO into a harder ferrimagnet, Mn(3)O(4). Our results indicate that the antiferromagnetic Mn enabled stronger coupling with NiFe than MnO. In addition, we find that the MnO-Mn(3)O(4) coupling dominates the exchange bias effects at high oxygen concentrations.
|Appears in Collections:||材料科學與工程學系|
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