Disorder-induced significant enhancement in magnetization of ball-milled Fe2CrGa alloy
H. G. Zhang, C. Z. Zhang, W. Zhu, E. K. Liu, W. H. Wang, H. W. Zhang,, J. L. Cheng, H. Z. Luo, G. H. Wu
TL;DR
This study demonstrates that ball-milling induces atomic disorder in Fe2CrGa alloy, significantly enhancing its magnetization and Curie temperature, with insights from experiments and first-principles calculations.
Contribution
It reveals a new disordered atomic configuration in Fe2CrGa alloy and links atomic disorder to magnetic property enhancement, challenging empirical rules.
Findings
Magnetic moment increased to 3.2-3.9 μB
Curie temperature increased by about 200 K
Atomic disorder influences magnetic interactions
Abstract
A new disordered atom configuration in Fe2CrGa alloy has been created by ball-milling method. This leads to a significant enhancement of the magnetic moment up to 3.2~3.9 {\mu}B and an increase of Curie temperature by about 200 K, compared with the arc-melt samples. Combination of first-principles calculations and experimental results reveals that Fe2CrGa alloy should crystallize in Hg2CuTi based structure with different atomic disorders for the samples prepared by different methods. It is addressed that magnetic interactions play a crucial role for the system to adopt such an atomic configuration which disobeys the empirical rule.
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Taxonomy
TopicsMagnetic Properties of Alloys · Heusler alloys: electronic and magnetic properties · Rare-earth and actinide compounds