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在非平衡生长的Fe-Ga单晶体中通过快速定向固化进行超高磁阻力

Yichen Xu¹, Yuye Wu¹, Yunquan Li¹

¹School of Materials Science and Engineering, Beihang University, Beijing, 100191, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|April 22, 2025

概括

一种新的快速定向固化 (RDS) 方法使不平衡的Fe-Ga单晶能够增长,并且具有增强的磁阻力. 这一突破克服了以前的局限性,为工程应用中的先进材料铺平了道路.

科学领域:

材料科学材料科学材料科学
固态物理固态物理
晶体学晶体学是指结晶学.

背景情况:

已知非平衡微观结构,特别是Fe-Ga单晶体中的Tb超和,可以增强磁收缩.
目前的方法难以产生非平衡单晶,这限制了磁缩的进步.

研究的目的:

开发一种用于生长非平衡单晶的新策略.
通过受控的非平衡处理,实现显著的磁阻强化.

主要方法:

采用了快速定向固化 (RDS) 策略.
实现了超高的温度梯度 (≈10^6 K m^-1) 和超快的增长速度.
在非平衡条件下的单晶生长中利用了巨大的冷却速率 (10^2-10^3 K s^-1).

主要成果:

成功生长了一个非平衡的Fe-Ga单晶与Tb超和.
在散装Fe-Ga材料中实现了489 ppm的创纪录磁收缩,比之前的单晶值增加了60%.
与以前的方法不同,RDS方法在非平衡条件下产生单晶.

结论:

对于制造具有优越性质的非平衡单晶,RDS策略是有效的.
这一进步为工程应用创造高性能单晶的新可能性.
这项研究表明了一条途径,可以克服在实现增强磁性约束方面存在的限制.

关键词:

-Ga 是一个Fe-Ga.磁力强度是指磁力强度的强度.没有平衡的不平衡.快速方向固化的固化.一个单晶的单晶.

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