Origin of Magnetic Anisotropy of Gd5Si2Ge2 Compound
R. Szymczaka, R. Kolanob, A. Kolano-Burianb, L. Hawelekb, B. Krzymanskaa, P. Aleshkevicha, V.P. Dyakonova and H. Szymczaka
aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland
bInstitute of Non-Ferrous Metals, Gliwice, Poland
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The second-order anisotropy constant K2 in polycrystalline Gd5Si2Ge2 giant magnetocaloric material was measured as a function of temperature by the modified singular point detection technique. Although the structural, electrical, thermal, magnetic and magnetocaloric properties of the Gd5Si2Ge2 have been rather well investigated experimentally, magnetic anisotropy of this system is almost unknown. The singularity indicating the anisotropy field was determined analyzing ac susceptibility data taking into account several features of the magnetization curve. The temperature dependence of the anisotropy fields was measured from 4.2 K up to the Curie temperature. The observed relationship between K2 (T)/K2 (0) and magnetization M (T)/M (0) was explained assuming dipolar origin of magnetic anisotropy of Gd5Si2Ge2 compound.
DOI: 10.12693/APhysPolA.121.1261
PACS numbers: 75.30.Gw, 75.30.Sg