Giant isotropic magnetostrain of GaCMn3

Abstract

Normal magnetostriction (MS), which comes from the gradual rotation of magnetic domains in ferromagnets, is anisotropic and smoothly dependent on the applied magnetic field. In cubic antiperovskite compound GaCMn3, a sharp shrink of lattice volume takes place at the antiferromagnetic (AFM) to intermediate magnetic (IM) phase transition. Below the Neel temperature (∼143 K), the AFM-IM transformation can be driven by external magnetic field, leading to a giant isotropic MS of ∼1700 ppm comparable to that of commercial Terfenol-D. In contrast to normal MS, the field-induced magnetostrain exhibits a rapid switch behavior at the critical field. Furthermore, good reversibility and stability were demonstrated for the giant MS of GaCMn3 compound.

Magnetocaloric effect and critical behavior of the Mn-rich itinerant material Mn3GaC with enhanced ferromagnetic interaction*

“…Itinerant electronic materials are excellent candidates to explore functional materials. Among them, Mn-based itinerant materials are such examples that have attracted more attention due to the important findings including giant magnetoresistance (GMR), [1,2] magnetocaloric effect (MCE), [3][4][5][6] negative thermal expansion (NTE), [7][8][9][10][11][12][13] and magnetostriction (MS), [14][15][16] etc. Mn 3 GaC exhibits various magnetic/structural phase transitions and has been widely investigated.…”

“…[1][2][3][4][5] Meanwhile, giant isotropic MS (1700 ppm) is found near the AFM-IFM phase transition. [15] In addition to important experimental findings, some basic scientific issues remain controversial on these FM materials after many years of exploration.…”

Magnetoelastic transition and giant anisotropic magnetostriction effect in textured Mn<sub>1.9</sub>Co<sub>0.1</sub>Sb polycrystal

“…Ma等人 [10] 研究了(110)取向方向上 的Terfenol-D的磁致应变大小, 发现当存在特殊的取向 时, 材料的饱和磁致应变大小要高于无取向材料的饱 和磁致应变值. 2017年, Guo等人 [11] 在多晶的反钙钛矿 . 正分的Mn 2 Sb不会发生一级磁相变, 但是 通过过渡族元素取代Mn位 [14][15][16][17][18][19][20][21][22][23] 或主族元素取代Sb 位 [24][25][26][27] , 合金在低温下出现反铁磁态, 导致发生亚铁磁 到反铁磁的一级磁弹性相变, 相变附近伴随有晶格常 数a和c的各向异性突变, 但晶体的对称性保持不变.…”