Magnetic Properties and Magnetostriction of R2Fe17H3±x (R = Tb, Dy) Hydrides
The magnetic anisotropy (MA) of trihydrides of single-crystalline rare-earth (R) intermetallics R2Fe17H3±x (R = Tb and Dy) with small deviations in the hydrogen concentration (x = 0 – 0.4) was investigated via the magnetic and magnetoelastic measurements in a wide temperature region. The easy-axis MA of Tb2Fe17H3±x is preserved in the entire range of magnetically ordered state while an “easy-cone – easy-plane” transition takes place in Dy2Fe17H3±x above ambient temperatures. The trihydrides demonstrate a significant decrease of magnetic anisotropy as the temperature increases. The temperature variation of thermal expansion of Dy2Fe17H3 displays anomalies in the vicinity of a spin-reorientation transition. The longitudinal magnetostriction λ||(T) of the same compound changes its sign at 340 K. The compounds studied can find specific applications in practice.
Nikolai Perov and Anna Semisalova
I. S. Tereshina et al., "Magnetic Properties and Magnetostriction of R2Fe17H3±x (R = Tb, Dy) Hydrides", Solid State Phenomena, Vols. 233-234, pp. 259-262, 2015