Onset Magnetic Field for Rearrangement of Martensite Variants in Ni2MnGa
The magnetic field strength, Hs, at which rearrangement of martensite variants initiates has been investigated in Ni2MnGa ferromagnetic shape memory alloy by magnetization measurements in the P direction ("P" stands for the parent phase). We have also calculated Hs from the magnetocrystalline anisotropy constant Ku, spontaneous magnetization Ms, twinning shear s and twinning stress τreq by considering the condition for the rearrangement of martensite variants reported previously [Int. J. Appl. Electromagnetics and Mechanics, 23 (2006) 45]. The calculated value of Hs is in good agreement with the experimental value for all the examined temperatures. The agreement confirms the applicability of the reported condition.
Young Won Chang, Nack J. Kim and Chong Soo Lee
T. Fukuda et al., "Onset Magnetic Field for Rearrangement of Martensite Variants in Ni2MnGa", Materials Science Forum, Vols. 561-565, pp. 1109-1112, 2007