title: Realization of magnetostructural coupling by modifying structural transitions in MnNiSi-CoNiGe system with a wide Curie-temperature window.
abstract: 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.
authors.affiliation: 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.
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.affiliation: 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.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Gong
authors.affiliation: 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.
authors.forename: Guizhou
authors.initials: G
authors.lastname: Xu
authors.affiliation: Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Guo
authors.initials: G
authors.lastname: Peng
authors.affiliation: 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.
authors.forename: Ishfaq Ahmad
authors.initials: IA
authors.lastname: Shah
authors.affiliation: 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.
authors.forename: Najam
authors.initials: N
authors.lastname: Ul Hassan
authors.affiliation: 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.
authors.forename: Feng
authors.initials: F
authors.lastname: Xu