Anomalous asymmetric magneto-inductance in amorphous Co68.2Fe4.3Si12.5B15 wire with shifted hysteresis loop

The quasi-saturated hysteresis M(H) loop of a nearly zero magnetostrictive CoFeSiB wire, annealed at 470 degrees C and pre-magnetized with a positive field of 16 kA m(-1), is shifted 0.23 A m(-1) in the negative field direction. The magneto-inductance L(H) curve of this wire is extremely asymmetric, exhibiting a few times greater L in the positive than in the negative H. The shifted loop can be logically explained by considering the magnetostatic interaction between positively aligned hard magnetic crystallites and a soft magnetic matrix. However, a similar explanation for the asymmetry of the magneto-inductance is invalid, and therefore this effect can be regarded as an anomalous behaviour in the technical magnetization of some multiphase ferromagnets.