Liu Jun, Gong Yuanyuan, Xu Guizhou, Peng Guo, Shah Ishfaq Ahmad, Ul Hassan Najam, Xu Feng
Jiangsu Key Laboratory of Advanced Micro&Nano Materials and Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China.
Sci Rep. 2016 Mar 16;6:23386. doi: 10.1038/srep23386.
The magnetostructural coupling between structural and magnetic transitions leads to magneto-multifunctionalities of phase-transition alloys. Due to the increasing demands of multifunctional applications, to search for the new materials with tunable magnetostructural transformations in a large operating temperature range is important. In this work, we demonstrate that by chemically alloying MnNiSi with CoNiGe, the structural transformation temperature of MnNiSi (1200 K) is remarkably decreased by almost 1000 K. A tunable magnetostructural transformation between the paramagnetic hexagonal and ferromagnetic orthorhombic phase over a wide temperature window from 425 to 125 K is realized in (MnNiSi)1-x(CoNiGe)x system. The magnetic-field-induced magnetostructural transformation is accompanied by the high-performance magnetocaloric effect, proving that MnNiSi-CoNiGe system is a promising candidate for magnetic cooling refrigerant.
结构转变与磁转变之间的磁结构耦合导致了相变合金的磁多功能性。由于多功能应用需求的不断增加，寻找在较大工作温度范围内具有可调磁结构转变的新材料具有重要意义。在这项工作中，我们证明通过将MnNiSi与CoNiGe进行化学合金化，MnNiSi的结构转变温度（1200 K）显著降低了近1000 K。在(MnNiSi)1-x(CoNiGe)x体系中，实现了在425至125 K的宽温度窗口内顺磁六方相和铁磁正交相之间的可调磁结构转变。磁场诱导的磁结构转变伴随着高性能磁热效应，证明MnNiSi-CoNiGe体系是磁制冷制冷剂的一个有前景的候选材料。
