电沉积FeCo合金薄膜场致单轴各向异性的穆斯堡尔谱研究
Mössbauer study of the field induced uniaxial anisotropy in electro-deposited FeCo alloy films
摘要：
具有面内磁各向异性的铁磁薄膜是获得高微波磁导率的理想材料。本文报道了用穆斯堡尔谱研究电沉积$FeCo$合金薄膜中的场致面内单轴各向异性。采用电沉积法制备了$FeCo$合金薄膜，并在沉积过程中施加了平行于薄膜平面的外加磁场。室温下的振动样品磁强计和穆斯堡尔谱测量表明，外场沉积的薄膜表现出面内单轴各向异性，其易磁化方向与外场方向一致，而硬磁化方向与外场方向垂直，而无外场沉积的薄膜则不表现出任何面内各向异性.在三种几何排列下的穆斯堡尔谱表明，对于外加磁场沉积的薄膜，其磁矩几乎被限制在薄膜平面内。在沉积过程中，磁矩倾向于沿外加磁场的方向排列，表明所观察到的各向异性应归因于原子对的方向有序性。
英文摘要：
Thin ferromagnetic films with in-plane magnetic anisotropy are promising materials for obtaining high microwave permeability. The paper reports on the Mössbauer study of the field induced in-plane uniaxial anisotropy in electro-deposited $FeCo$ alloy films. The $FeCo$ alloy films have been prepared by electro-deposition method with and without external magnetic field applied parallel to the film plane during deposition. The vibrating sample magnetometry and Mössbauer spectroscopy measurements at room temperature indicate that the film deposited in external field shows an in-plane uniaxial anisotropy with an easy direction coincides with the external field direction and a hard direction perpendicular to the field direction, whereas the film deposited without external field doesn't show any in-plane anisotropy. Mössbauer spectra taken in three geometric arrangements show that the magnetic moments are almost constrained in the film plane for the film deposited with applied magnetic field. And the magnetic moments are tend to align in the direction of the applied external magnetic field during deposition, indicating that the observed anisotropy should be attributed to directional ordering of atomic pairs.
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