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Large,low-field and reversible magnetostrictive effect in MnCoSi-based metamagnet at room temperature

查看全文 作　　者：Jun [1]Liu;Yuanyuan [1]Gong;Fengqi [2]Zhang;Yurong [1]You;Guizhou [1]Xu;Xuefei [1]Miao;Feng [1]Xu 高影响力作者 机构地区：[1]MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;[2]Fundamental Aspects of Materials and Energy(FAME),Faculty of Applied Sciences.Delft University of Technology,Mekelweg 15,2629JB Delft,the Netherlands高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第17期,共7页高影响力期刊 基　　金：the National Natural Science Foundation of China(No.11974184);National Natural Science Foundation of China for the Central University(No.30919012108);the Fundamental Research Funds for the Central Universities。 摘　　要：TiNiSi-type MnCoSi-based alloys show large magnetostriction during the magnetic-field-induced metamagnetic transition.However,the high critical field required to drive the transition directly hinders their potential applications.In this work,we systematically investigate the tricritical behavior and magnetostrictive effect in substituted MnCoSi alloys.Replacing Si with Sb or In,Co with Fe or Cu,and Mn with Co,which can simultaneously reduce the critical field and the temperature of tricritical point,are explored.Among the substituted MnCoSi alloys,Mn_(0.983)Co_(1.017)Si displays a temperature of a tricritical point of 250 K and a room-temperature critical field of 0.60 T,which is the lowest up to now.Profited from these optimizations,a large reversible magnetostrictive effect under low field is successfully realized at room temperature.In a field of 1 T,the magnetostriction of Mn_(0.983)Co_(1.017)Si alloy is close to 1000 ppm.Besides,a strong relation between critical field and valence electron concentration is revealed in the transition-metal-substituted MnCoSi alloys.Our work greatly enhances the low-field magnetostrictive performance of MnCoSi-based alloys and make them be of interest in potential applications. 关 键 词：Magnetostrictive effect Magnetoelastic transition Tricritical point REVERSIBILITY MnCoSi alloy
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