Experimental evaluation of magnetic anisotropy based on magnetic Barkhausen noise

The magnetic Barkhausen noise technology is applied to the evaluation of the magnetic anisotropy of typical materials, and the factors that affect the magnetic easy axis and the degree of magnetic anisotropy are determined. By discussing the three mechanisms affecting the magnetic anisotropy, the magnetic Barkhausen noise envelope curve is divided into different magnetization sections. A multi-angle magnetic Barkhausen noise experimental test system was constructed, experiments were performed on 4 typical materials, and pole figures with different magnetization stages and different characteristic parameters were obtained. Comparative studies were conducted to analyze the influence of excitation frequency, excitation current and different magnetization sections on the results of magnetic anisotropy. The results show that the characteristic parameters extracted from different magnetized sections can reflect the magnetic anisotropy caused by different mechanisms, and the detection parameters suitable for the study of magnetic anisotropy are different for each material.