Strain-magnetization effect in superelastic Ni-Mn-Ga microfiber

Abstract Ni-Mn-Ga microfiber with a diameter of 80 μm was produced by glass-coated melt spinning method. The martensitic transformation temperature, TM, and the reverse transformation temperature, TA, is 279 K and 290 K, respectively. The as-cast microfiber shows nearly fully recoverable superelastic strain as large as ~10%, and perfect strain-magnetization effect, as the stress-induced martensite has lower initial susceptibility and higher saturation magnetization than the austenite. It will be a potential non-destructively and noncontactually monitor sensor material.