Magnetism, spintronics

A change in the exchange integral due to the hydrogen atoms introduction into the crystal lattice of Terfenol-D

A. A. Aleroev^ab, I. S. Tereshina^a, T. A. Aleroeva^c, N. Yu. Pankratov^a, S. A. Nikitin<sup>a

a</sup> Lomonosov Moscow State University, Moscow, Russia
^b State Petroleum Groznii University
^c Russian State Agrarian University – Moscow Agricultural Academy after K.A. Timiryazev, Moscow, Russia

Abstract: The effect of hydrogenation on the structural and magnetic characteristics of the compound Tb$_{0.3}$Dy$_{0.7}$Fe$_2$ (Terfenol-D) was investigated. A hydride Tb$_{0.3}$Dy$_{0.7}$Fe$_2$H$_3$ with a Curie temperature near room temperature and a magnetic compensation point at $T$ = 140 K was obtained. The main mechanisms responsible for both the change in the Curie temperature during hydrogenation and the appear of a noticeable volume magnetostriction near the Curie temperature were established. The change in the exchange integral upon the introduction of a fixed of hydrogen atoms (3 at.H/f.u.) into the crystal lattice of the Tb$_{0.3}$Dy$_{0.7}$Fe$_2$ compound was calculated.

Keywords: rare earth compounds, Laves phases, hydrides, Curie temperature, magnetostriction.

Received: 18.06.2024
Revised: 18.06.2024
Accepted: 20.06.2024

DOI: 10.61011/FTT.2024.08.58603.156