Structural and magnetic susceptibility studies of samarium substituted magnesium–zinc ferrites

• Published in: Journal of alloys and compounds 2009-08, Vol.482 (1), p.147-150
• Main Authors: Melagiriyappa, E., Jayanna, H.S.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Diamagnetism, paramagnetism and superparamagnetism; Domain structure; Exact sciences and technology; Ferrites; IR spectra; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Nonmetals; Physics; Saturation magnetization; Saturation moments and magnetic susceptibilities; Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2009.03.112

Polycrystalline soft ferrites Mg 1− x –Zn x –Fe 2− y –Sm y –O 4 ( x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0; y = 0.0, 0.05 and 0.1) were prepared by usual ceramic method. The samples were characterized by X-ray diffraction and IR techniques. Magnetic properties have been studied from magnetization and (a)–(c) susceptibility measurements. The XRD patterns of all the samples reveal the formation of single-phase cubic spinel. The IR spectra show two strong absorption bands in the frequency range 300–800 cm −1. The magnetization measurements exhibit the Neel's collinear ferrimagnetic behavior for x ≤ 0.2 and suggest non-collinear Y–K (Yaffet–Kittel) type magnetic ordering for x ≥ 0.4. The samples with x ≥ 0.8 are paramagnetic at and above the room temperature. Variation of ac susceptibility with temperature exhibit the single domain structure (SD) with x = 0.0 and multi-domain (MD) structure with x ≥ 0.2 on substitution of Zn 2+ content. On substitution of Sm 3+ content, the samples exhibit SD for x = 0.0, MD for x = 0.2 and MD to SP transition for x ≥ 0.4.