Temperature invariable magnetization in Co-Al-Fe alloys by a martensitic transformation
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Temperature invariable magnetization in Co-Al-Fe alloys by a martensitic transformation
- 发表刊物：
- Applied Physics Letters
- 摘要：
- Recently, it has been reported in a dual-phase ferromagnetic Fe-Ga alloy, highly thermally stable magnetization is achieved by a diffusional transformation between the two phases with different magnetizations, which compensates for the inevitable magnetization reduction. Contrasting with the compensation mechanism through a diffusional transformation, here we report a diffusionless martensitic transition can also be used as a compensation mechanism for achieving nearly temperature invariable magnetization. We found that ferromagnetic Co-Al-Fe alloys with a non-thermoelastic martensitic transformation exhibit almost unchanged magnetization up to 830 K (about 81% TC). In-situ heating transmission electron microscopy (TEM) reveals that the gradual transformation from a hexagonal close-packed (hcp) martensite phase with lower magnetization into a face-centered-cubic (fcc) parent phase with higher magnetization occurs over a wide temperature range, giving rise to such temperature invariable magnetization. The electrical resistivity measurement reveals that the fcc → hcp transformation can be repeated during heating-cooling cycles, which can be used to design temperature invariable magnets with long cycling life.
- 合写作者：
- F. Ye, T.Y. Ma*, S. Ren, A.D. Xiao, X.L. Liu, Y.C. Ji*, and X.B. Ren*
- 卷号：
- 113
- 页面范围：
- 172402
- 是否译文：
- 否
- 发表时间：
- 2018-10-22