Understanding the magnetic anisotropy in Fe-Si amorphous alloys

Diaz, J. ; Hamdan, N.M. ; Jalil, P. ; Hussain, Z. ; Valvidares, S.M. ; Alameda, J.M.

Lawrence Berkeley National Laboratory

关键词: Fine Structure;    Magnetrons;    Orientation;    Alloys;    Magnetic Moments;   

DOI  :  10.2172/820783
RP-ID  :  LBNL--50856
RP-ID  :  AC03-76SF00098
RP-ID  :  820783

美国|英语

来源: UNT Digital Library

【 摘 要 】

The origin of the magnetic anisotropy in a very disordered Fe-Si alloy has been investigated. The alloy containing 40 percent at. Si was prepared in the form of a thin film in a DC magnetron sputtering chamber. Structural disorder was obtained from Extended X-ray Absorption Fine Structure spectroscopy. The uniformity and lack of inhomogeneities at a microscopic level was checked by measuring their transverse magnetic susceptibility and hysteresis loops. The orbital component of the magnetic moment was measured by X-ray Magnetic Circular Dichroism spectroscopy. The orbital moment was extraordinary high, 0.4mB. Such a high value contrasted with the relatively small uniaxial anisotropy energy of the thin film (2kJ/m3). This suggests that the cause of the magnetic anisotropy in this alloy was a small degree of correlation in the orientation of the local orbital moments along a preferential direction.