High Field Magnetization
The Heusler shape memory alloys undergo an austenite to martensite structural transition, accompanied by a large change in the magnetic structure. A field induced magnetostructural transition can be observed near to the martensitic transition temperature. Sometime they show a field-induced irreversibility near the martensitic transition due to a partial or complete arrest of the supercooled austenite phase. The irreversible behavior becomes less pronounced by moving away from the transition temperature and vanishes at a finite temperature when measured in a finite field available in the lab. With help of pulsed magnetic field study on different families of Heusler shape memory alloys, we demonstrate the existence of a field-induced irreversibility at temperature much below the martensitic transition. This irreversibility can lead to a hysteresis width as large as 24 T in some of these materials [1].
![Figure 1: 60T pulsed field magnetization study in shape memory alloys.](/2872891/original-1518441267.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjI4NzI4OTF9--1bf1839d5fe3aa56724fe55545e3f595a8cfcf31)
Figure 1: 60T pulsed field magnetization study in shape memory alloys.