MM'X(M,M'=transition metals,X=carbon or boron group elements)compounds could exhibit large magnetocaloric effect due to the magnetostructural transition,and the composition regulation has been widely studied to realize the magnetostructural transition.Moreover,the magnetostructural transition is also sensitive to the pressure.Herein,the effect of hydrostatic pressure on magnetostructural trans-formation and magnetocaloric effect has been investigated in Mn0.94Feo.06NiGe compound.Dual regula-tion effect of lowering structural transition temperature and strengthening ferromagnetic(FM)state of martensite is realized by applying hydrostatic pressure,which would greatly improve the magnetocaloric effect of Mno.94Feo.06NiGe compound.Moreover,the first-principles calculations have also been performed to discuss the origin of the regulation effect under hydrostatic pressure,and it indicates that the hydro-static pressure can stabilize the hexagonal structure and decrease the structural transition temperature.The maximum isothermal entropy change increases by 109％from 4.3 J/(kg K)under 0 GPa to 9.0 J/(kg K)under 0.402 GPa for a magnetic field change of 0-3 T.This work proves that the hydrostatic pressure is an effective method to regulate the magnetostructural transition and enhance magnetocaloric effect in MM'X compounds.

He Zhou;Dekun Wang;Zhe Li;Junzhuang Cong;Ziyuan Yu;Shuo Zhao;Peng Jiang;Daoyong Cong;Xinqi Zheng;Kaiming Qiao;Hu Zhang

School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;College of Physics and Electronic Engineering.Key Laboratory for Advanced Functional and Low Dimensional Materials of Yunnan Higher Education Institute,Qujing Normal University,Qujing 655011,China;MultiFields Technologies(Beijing)Co.Ltd.,Beijing 100190,China;State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

材料科学技术（英文版）

[1]He Zhou;Dekun Wang;Zhe Li;Junzhuang Cong;Ziyuan Yu;Shuo Zhao;Peng Jiang;Daoyong Cong;Xinqi Zheng;Kaiming Qiao;Hu Zhang-.Large enhancement of magnetocaloric effect induced by dual regulation effects of hydrostatic pressure in Mn0.94Feo.06NiGe compound)[J].材料科学技术（英文版）,2022(19):73-80

94Feo,06NiGe,magnetostructural,Mno

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