A model-assisted technique for characterization of in-plane magnetic anisotropy

作者：Fan B; Lo C C H^*

来源：Journal of Applied Physics, 2012, 111(7): 07E344.

DOI：10.1063/1.3679435

This paper describes a novel technique for characterizing in-plane magnetic anisotropy, such as stress anisotropy. The method involves applying a radially spreading ac field to a test sample, and detects simultaneously the field signals emanating from the sample surface along different directions using an angular array of Hall effect sensors. The technique was applied to detect the stress-induced anisotropy in an annealed Fe plate. Under uniaxial tension, the field signal measured along the stress axis increases while that along the transverse axis decreases. The stress sensitivity of the technique was characterized in terms of the ratio of the field signals measured along and perpendicular to the stress axis. The ratios measured at both the first-and third-order harmonic frequencies increase monotonically with stress, with the latter showing a higher stress sensitivity. The stress dependence of the field signal ratio was modeled based on the magnetomechanical effect theory, and was found to agree with the experimental results.

• 出版日期2012-4-1