Magnetic Properties of Y_3－2xCa_2xFe_5－xV_xO₁₂ Garnets

Imaddin A. Al-Omari, Ralph Skomski, David J. Sellmyer

Department of Physics and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, USA.
Department of Physics, P.O. Box 36, Sultan Qaboos University, Muscat, Sultanate of Oman.

DOI: 10.4236/ampc.2012.23019                

Abstract

A comprehensive study of the magnetic properties of Y_3－2xCa_2xFe_5－xV_xO₁₂ (0 ≤ x ≤ 1) has been performed. The garnet ferrites samples were prepared by the ceramic technique, and X-ray diffraction analysis indicates the formation of single cubic phase. Vibrating sample magnetometry (VSM) and a superconducting quantum-interference device (SQUID) were used to measure the magnetic properties, especially the magnetization and thermo-magnetic behavior. The magnetization curves exhibit the typical characteristics of ferrimagnetic materials at both 4.2 K and at room temperature. The samples have a low coercivities (between 20 and 40 Oe) and saturation magnetizations as high as 36 emu/g at 4.2 K. The saturation magnetization decreases with V and Ca contents, reaching about 8 emu/g at 4.2 K (x = 1). For all samples, the saturation magnetization decreases with increasing temperature, whereas the Curie temperature increases for small values of x, from 557 K for x = 0 to a maximum of 590 K for x = 0.2. For larger values of x, it decreases and reaches 525 K for x = 1.0. The basic experimental trends reflect the occupancy of the tetrahedral 24d sites by vanadium in combination with the predominant intersublattice exchange constant Jad, although the nonzero magnetization at x = 1.0 indicates that about 10% of the substituted V atoms goes onto the octahedral 16a sites.

Keywords

Yttrium Iron Garnets; Curie Temperature; Saturation Magnetization; Magnetic Moment

Conflicts of Interest

The authors declare no conflicts of interest.

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