The magnetic field influence on magnetostructural phase transition in Ni2.19Mn0.81Ga

TL;DR

This study investigates how magnetic fields influence the magnetostructural phase transition in Ni2.19Mn0.81Ga, revealing hysteresis and the shift of transition temperature with field strength in a polycrystalline alloy.

Contribution

It provides new insights into the magnetic field effects on the phase transition temperature and hysteresis behavior in Ni-Mn-Ga alloys.

Findings

Hysteretic behavior observed in magnetization curves.

Transition temperature increases with magnetic field.

Magnetostructural transition shifts to higher temperatures under stronger fields.

Abstract

Magnetic properties of a polycrystalline alloy Ni$_{2.19}$Mn$_{0.81}$Ga, which undergoes a first-order magnetostructural phase transition from cubic paramagnetic to tetragonal ferromagnetic phase, are studied. Hysteretic behavior of isothermal magnetization $M(H)$ has been observed in a temperature interval of the magnetostructural transition in magnetic fields from 20 to 100 kOe. Temperature dependencies of magnetization $M$, measured in magnetic fields $H = 400$ and 60 kOe, indicate that the temperature of the magnetostructural transition increases with increasing magnetic field.