Abstract
The substitution effect of Fe by Co on magnetic properties (magnetization, anisotropy field, Curie temperature) of R(TM,Ti)12 (R=Y, Sm; TM=Fe, Co) single crystals have been studied. The temperature and composition dependence of magnetization and magnetic anisotropy constants K1 and K2 in the range 77–1000 K have been determined using torque and vibrating specimen magnetometry techniques. 57Fe Mossbauer spectra of powdered samples of SmFe11−xCoxTi have been studied at room temperature. The easy magnetization direction of RFe11−xCoxTi single crystals was found to be coinciding with the c axis for x≤5. A characteristic maximum in concentration dependence of saturation magnetization is found for x≈3. The concentration dependence of magnetic anisotropy constant K1 for RFe11−xCoxTi single crystals exhibited a maximum at x≈1. It is found that the Sm-sublattice contribution to magnetic anisotropy decreases rapidly with increasing Co concentration.
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