DataVXAdvanced SciencePaper
journal article·2025-10Open access

Impact of Controlled Magneto‐Structural Coupling in MnCoGe‐Based Compounds on the Design of Multifunctional Materials for Technological Advances

Kang Liu, Xiaowen Hao, Wayne D. Hutchison, Stewart J. Campbell, Xiaoming Huang, Cuiping Zhang, Guoliang Li, Xuefei Miao, Fengjiao Qian, Jianli Wang, Qingyong Ren

Advanced Science· Volume 12· Issue 39
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Abstract

Abstract Tailoring the magneto‐structural coupling in magnetic martensitic materials is pivotal for optimizing multifunctional properties such as magnetocaloric effect (MCE) and negative thermal expansion (NTE). This study demonstrates how Ni substitution in Mn 1‐ x Ni x CoGe ( x = 0.03 to 0.07) modulates the magneto‐structural transitions as investigated by in‐situ X‐ray diffraction, magnetization measurements, and geometric compatibility analysis. Ni doping is shown to stabilize the hexagonal phase, lower the martensitic transformation temperature, and introduce intermediate ferromagnetic hexagonal (FM‐Hex) states, thereby altering the transition pathways from a single paramagnetic hexagonal (PM‐Hex) ↔ ferromagnetic orthorhombic (FM‐Orth), to a two‐step PM‐Hex ↔ FM‐Hex ↔ FM‐Orth sequence. This modification in the magneto‐structural coupling alleviates lattice incompatibility, broadens phase transition temperature window, and enhances magnetization changes during the phase transition. The magnetocaloric refrigeration capacity increases from 213(14) J kg −1 for x = 0.04 to 308(18) J kg −1 for x = 0.07 under a 5 T driving field, while the NTE coefficient is tuned from ‐375(1) × 10 −3 K −1 for x = 0.05 to ‐143(1) × 10 −3 K −1 for x = 0.07. These findings provide mechanistic insights into the interplay between magnetization states and lattice compatibility, thereby advancing the design of energy‐efficient solid‐state cooling and precision actuators through controllable magneto‐structural coupling.
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Research context

OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Shape Memory Alloy Transformations · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Applied Physics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China

Spallation Neutron Source Science Center Dongguan 523803 China

Guangdong Provincial Key Laboratory of Extreme Conditions Dongguan 523803 China

School of Science UNSW Canberra at the Australian Defence Force Academy Australian Capital Territory 2600 Australia

Key Laboratory of Artificial Structures and Quantum Control School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China

Beijing Key Lab of Microstructure and Property of Advanced Materials College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China

School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China

Institute for Superconductivity and Electronic Materials University of Wollongong Wollongong 2500 Australia

Center for Neutron Scattering and Advanced Light Sources Dongguan University of Technology Dongguan 523000 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Basic and Applied Basic Research Foundation of Guangdong Province

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