Date:

2025-04-30

Title of Paper:

Ferromagnetic composite with stress-insensitive magnetic permeability: compensation of stress induced anisotropies

Journal:

Physical Review Materials

Summary:

Single-phase ferromagnets show deterioration of magnetic permeability when operating under a pre-stress due to the stress-induced anisotropy, which is a serious restriction for soft magnets. However, technologically, it is highly desired that soft magnets can maintain stable permeability under high stress. Here we report that a ferromagnetic Fe-Ga composite exhibits nearly unchanged magnetic permeability and coercivity even when subjected to compressive pre-stress as high as 200 MPa. Such stress-insensitive magnetic properties stem from the compensation of stress-induced anisotropies between the two ferromagnetic components with opposite magnetostriction signs (λ > 0 for the BCC phase and λ < 0 for the FCC phase). The magnetomechanical measurements and phase field simulations revealed that the stress-induced domain switching pathways are competitive between the BCC and the FCC phases, ruling out the pre-stress influence on magnetization. The present finding may provide a general recipe for designing soft magnets with stable magnetic properties under high stress.

Co-author:

J.M. Gou, X.L. Liu, C.S. Zhang, Y.N. Shi, T.Y. Ma*, X.B. Ren et al.

Translation or Not:

No

Date of Publication:

2018-10-23