Spin Reorientation and Exchange Coupling in the Dy1-xErxFe10Si2 Compounds
P. Stefański, A. Kowalczyk, D. Skoryna, A. Szlaferek and A. Wrzeciono
Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17/19, 60-179 Poznań, Poland
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The structural and magnetic properties of Dy1xErxFe10Si2 are investigated. X-ray analysis reveals that these compounds are of the tetragonal ThMn12 structure. In this structure the rare earth atoms occupy one crystallographic position 2(a). The unit cell contains 26 atoms. The spin reorientation temperature, TSR, was measured from the temperature dependence of the initial susceptibility using an ac bridge of mutual inductance of the Harsthorn type. Dy+3 and Er+3 have opposite contributions to the entire magnetic anisotropy. The spin reorientation temperature is found to be about 271 K in DyFe10Si2 and 48 K in ErFe10Si2. The values are discussed applying the crystal field model. The value of the rare earth-transition metal exchange coupling constant JRFe/kB derived from the mean-field model analysis of the Curie temperature is about -13 K. The Fe-Fe exchange integral is much higher and is equal to about 75 K.
DOI: 10.12693/APhysPolA.85.259
PACS numbers: 75.30.Gw, 75.50.Gg