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A. K. Nayak, C. Salazar Mejía, S. W. D'Souza, S. Chadov, Y. Skourski, C. Felser, and M. Nicklas, "Large field-induced irreversibility in Ni-Mn based Heusler shape-memory alloys: A pulsed magnetic field study," Physical Review B 90 (22), 1-5 (2014).

Pulsed Field Magnetization Study in Heusler Shape Memory Alloys (HSMA)

The HSMA 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 HSMA, 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].

<p><strong>Figure 1:</strong> 60T pulsed field magnetization study in shape memory alloys.</p> Zoom Image

Figure 1: 60T pulsed field magnetization study in shape memory alloys.

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