<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>L</mml:mi><mml:msub><mml:mn>1</mml:mn><mml:mn>0</mml:mn></mml:msub></mml:mrow></mml:math> rare-earth-free permanent magnets: The effects of twinning versus dislocations in Mn-Al magnets
Yuxiao Jia, Yuye Wu, Shuang Zhao, Shulan Zuo, Konstantin Skokov, Oliver Gutfleisch, Chengbao Jiang, Huibin Xu
Abstract
Defects of various kinds play a crucial role on coercivity in rare-earth-free permanent magnetic alloys with L10 structure. In this work, the negative effect of twin structure and the positive effect of dislocations on the coercivity are clarified in a systematic experimental study of L10-MnAl alloys, because the former defect can induce the nucleation of reversal domain and the latter can act as a pinning center. Thus, the combination of eliminating twin structure and introducing high-density dislocations could overcome the present bottleneck in magnetic performance. This work may inspire avenues for the development of L10 rare-earth-free permanent magnetic alloys.