Rare-earth and transition metal sublattice contributions to magnetization and magnetic anisotropy of R(TM,Ti)12 single crystals

• Published in: Journal of alloys and compounds Vol. 275-277; pp. 625 - 628
• Main Authors: Tereshina, I.S, Nikitin, S.A, Ivanova, T.I, Skokov, K.P
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 24.07.1998
• Subjects: Magnetic anisotropy constants; Magnetization; Ternary rare earth compounds; Torque moments; Magnetization; Torque moments; Magnetic anisotropy constants; Ternary rare earth compounds
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/S0925-8388(98)00406-X

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.