Permeability of Clustered Soft Magnetic Narrow Strips Controlled by a Surface Normal Magnetic Field

A unique functionality was reported for a thin film soft magnetic strip having a certain angle of inclined magnetic anisotropy. It can switch the magnetic domain by applying a surface normal field with a certain distribution. The domain switches between single domain and multi-domain. Our previous study shows that this phenomenon appears even in the case of the adjacent configuration of multiple narrow strips. In this report, magnetic permeability for alternating current (ac) was investigated. The result shows that the ac permeability changes drastically depending on the domain structure in the frequency range from 10 kHz to 13 MHz. This result leads to applying this phenomenon to a switched inductor working with low energy consumption or a sensor for detecting magnetic field distribution.