Large negative magnetoresistance in a ferromagnetic shape memory alloy: Ni2+xMn1−xGa
作者： C Biswas , R Rawat , SR Barman , None
DOI: 10.1063/1.1925757
关键词: Materials science 、 Scattering 、 Magnetic domain 、 Phase (matter) 、 Metallurgy 、 Ferromagnetism 、 Condensed matter physics 、 Magnetoresistance 、 Martensite 、 Shape-memory alloy 、 Austenite
摘要: 5% negative magnetoresistance (MR) at room temperature has been observed in bulk Ni2+xMn1−xGa. This indicates the possibility of using Ni2+xMn1−xGa as magnetic sensors. We have measured MR ferromagnetic state for different compositions (x=0–0.2) austenitic, premartensitic, and martensitic phases. is found to increase with x. While x=0 varies almost linearly austenitic premartensitic phases, phase it shows a cusplike shape. explained by changes twin domain structures phase. In phase, which does not structure, agrees theory based on s-d scattering model.
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