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A change in the exchange integral due to the hydrogen atoms introduction into the crystal lattice of Terfenol-D
Russian version
Aleroev A.A. 1,2, Tereshina I.S.1, Aleroeva T.A.3, Pankratov N.Yu 1, Nikitin S.A. 1
1Lomonosov Moscow State University, Moscow, Russia
2
3Russian State Agrarian University Timiryazev Moscow Agricultural Academy, Moscow, Russia
Email: abdurahman.rts@gmail.com, irina_tereshina@mail.ru, tamila_hinata.ru@mail.ru, pankratov@phys.msu.ru, nikitin@phys.msu.ru
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The effect of hydrogenation on the structural and magnetic characteristics of the compound Tb0.3Dy0.7Fe2 (Terfenol-D) was investigated. A hydride Tb0.3Dy0.7Fe2H3 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 Tb0.3Dy0.7Fe2 compound was calculated. Keywords: rare earth compounds, Laves phases, hydrides, Curie temperature, magnetostriction.
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