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Large Magnetoresistance and Magnetic Field Induced Strain in Ni 42.8 Co 7.7 Mn 38.8 Al 10.7 Heusler Alloy at Room Temperature
Author(s) -
Xuan Haicheng,
Zhang Tuo,
Wu Yafei,
Agarwal Sandeep,
Yang Huali,
Wen Xingcheng,
Wei Jiafeng,
Han Peide,
Du Youwei
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800185
Subject(s) - magnetic shape memory alloy , magnetoresistance , condensed matter physics , materials science , diffusionless transformation , magnetic domain , magnetic force microscope , ferromagnetism , magnetic field , alloy , martensite , austenite , magnetism , paramagnetism , magnetization , metallurgy , microstructure , physics , quantum mechanics
Large magnetoresistance and large magnetic field induced strain are observed in polycrystalline Ni 42.8 Co 7.7 Mn 38.8 Al 10.7 Heusler alloy. The martensitic transformation from ferromagnetic austenite to weak‐magnetic martensite is realized in the alloy around the room temperature. A magentoresistance of −45% and magnetic field induced strain up to −500 ppm are observed under the magnetic field of 90 kOe. The evolution of the topography and magnetic domain is measured by magnetic force microscopy under different magnetic fields. Dramatic changes in magnetic domain structures are observed and discussed in the martensitic transformation process. The magnetic field induced reverse martensitic transformation should account for the large magnetoresistance and magnetic field induced strain. The results indicate the potential application of Ni 42.8 Co 7.7 Mn 38.8 Al 10.7 alloy in magnetic multifunctional materials.