Abstract
The Co-sublattice anisotropy in Lu 2Co 17 consists of four competitive contributions from Co atoms at crystallographically different sites in the Th 2Ni 17-type of crystal structure, which result in the appearance of a spontaneous spin-reorientation transition (SRT) from the easy plane to the easy axis at elevated temperatures. In order to investigate this SRT in detail and to study the influence of Si substitution for Co on the magnetic anisotropy, magnetization measurements were performed on single crystals of Lu 2Co 17− x Si x ( x=0−3.4) grown by the Czochralski method. The SRT in Lu 2Co 17 was found to consist of two second-order spin reorientations, “easy-plane”–“easy-cone” at T SR1≈680 K and “easy-cone”–“easy-axis” at T SR2≈730 K. Upon Si substitution for Co, both SRTs shift toward the lower temperatures in Lu 2Co 16Si ( T SR1≈75 K and T SR2≈130 K) with the further onset of the uniaxial type of magnetic anisotropy in the whole range of magnetic ordering for Lu 2Co 17− x Si x compounds with x>1 due to a weakening of the easy-plane contribution from the Co atoms at the 6g and 12k sites to the total anisotropy.
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