铁基纳米微晶薄膜巨磁阻抗效应的Mossbauer研究

Mossbauer spectroscopic study of giant magneto-impedance effect in Fe-based nanocrystalline films

本文采用 M?ssbauer 谱学方法以及其它手段对 FeCuNbSiB 薄膜样品在退火过程中出现的巨磁阻抗效应发生显著变化的原因进行了探讨。研究表明,样品在退火过程中除了生长纳米晶粒α ? FeSi相对提高材料的软磁性能有利外,同时随退火温度变化样品中磁矩分布方向会发生重取向。由制备态到 570 ℃退火温度期间,薄膜样品磁矩取向发生由平行于平面为主变为垂直为主,而后再转变为平行为主。这些因素对多层膜巨磁阻抗效应的变化会产生重要影响,尤其当磁矩在垂直于平面方向分布占优势时,磁阻抗效应会显著下降。

In this paper, the M?ssbauer spectroscopy and other methods have been used to study giant magneto-impedance (GMI) effect of the FeCuNbSiB films following different temperature’s annealing. From as-deposited state to the sample annealed at 570 ℃, the magnetic moments of the films were orientated from the initial direction that was parallel to the film plane to the direction perpendicular to it, and later back. The GMI effect of the films varied with soft magnetic properties and magnetic moment’s orientation. When the orientation of moments was perpendicular to the film plane, the GMI ratio was decreased dramatically.