FMR properties of epitaxial Fe3O4 films on MgO(100)

被引:33
作者
Aktas, B [1 ]
机构
[1] Gebze Inst Technol, Dept Phys, TR-41410 Cayirova Gebze, Kocaeli, Turkey
关键词
anisotropy; iron oxide; magnetic properties and measurements; surface and interface states;
D O I
10.1016/S0040-6090(97)00311-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The magnetic properties of epitaxial Fe,O-3(4), films on MgO(100) substrate have been investigated. Spin wave resonance (SWR) technique has been used to study the magnetic anisotropy as a function of temperature between 4-300 K. The ferromagnetic resonance (FMR) spectra exhibit unusual unidirectional character upon cooling the sample in an external field H-c,. At higher temperatures, generally both the bulk and the surface modes appear as long as the external field is applied within a small angular interval with respect to the film normal. The bulk and the surface FMR modes are well separated from each other when the field, H-ap,, is parallel to the cooling field, H-c,, which is normal to the film plane. However these FMR modes surprisingly overlap and become only a single and broader absorption line when the applied field is antiparallel to the cooling field. Using a field-induced unidirectional exchange surface and bulk anisotropy, with the usual magneto-crystalline anisotropy energy, we have simulated the experimental spectra and deduced anisotropy and magnetic stiffness parameters as a function of temperature. (C) 1997 Elsevier Science S.A.
引用
收藏
页码:250 / 259
页数:10
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