Abstract: Transverse susceptibility and magnetization of transverse field annealed Metglas 2605CO

Abstract

Amorphous Fe‐B base ribbons have been shown to have large magnetoelastic coupling¹ when appropriately annealed in a transverse magnetic field. The domain structure of Metglas 2605CO (Fe₆₇Co₁₈B₁₄Si₁), when annealed as above, was observed by a Bitter technique. The magnetization of each domain is entirely transverse with the main Bloch walls normal to the axis of the ribbon. The domain width is about 0.3 mm. Longitudinal magnetization measurements indicate a rotational magnetization process. We have measured χ_yy and χ_yz (y normal to, and z along the axis of the ribbon) by passing an ac current through the ribbon in the presence of a bias field. χ_yy is defined as the susceptibility determined from the voltage drop along the ribbon. χ_yz is defined as the susceptibility determined from the voltage of a pickup coil wound around the sample. Anomalous structure is seen in values of χ_yy between 10 and 100 kHz. We speculate that transverse magnetoelastic resonances are the cause of the structure. The overall reduction in χ_yy as a function of frequency is larger than can be explained by normal eddy current analysis. Transverse magnetization loops at several longitudinal biases have been measured and show a strong nonlinearity as a function of the current. Metglas is a registered trademark of the Allied Chemical Corporation. ¹ C. Modzelewski, H. T. Savage, L. T. Kabacoff, and A. E. Clark, IEEE Trans. Magn. MAG‐17, 2837 (1981).