Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7992420 | Journal of Alloys and Compounds | 2018 | 26 Pages |
Abstract
We report a systematic study of the structural and magnetic properties of frustrated compounds of GaxMn(3âx)O4 (1.2â¯â¤â¯xâ¯â¤â¯1.6) prepared by solid-state reaction. Using Rietveld refinement of X-ray diffraction patterns and O'Neill-Navrotsky model, we demonstrate that the system GaxMn(3âx)O4 (1.2â¯â¤â¯xâ¯â¤â¯1.6) is an inverse spinel with low inversion parameter, in which Ga3+ replaces Mn3+ cations located in B-sites. The inverse magnetic susceptibility, the shape of ZFC/FC magnetization curves at low temperatures, the existence of hysteresis in all compounds, the frustration parameter and the spontaneous magnetization analysis show that the compounds with xâ¯=â¯1.2-1.4 exhibit a non-collinear ferrimagnetic order and the compounds with xâ¯=â¯1.5-1.6 exhibit a frustrated non-collinear ferrimagnetic order. Spin wave stiffness parameters were determined for each composition using the fitting results of spontaneous magnetization curves. It is demonstrated that for the compounds xâ¯=â¯1.2-1.4 with a non-frustrated ferrimagnetic order, the change of spontaneous magnetization Ms(T) obeys to Bloch's law (T3/2). For xâ¯=â¯1.5-1.6, the compounds exhibit a frustrated ferrimagnetic order, and the Ms(T) shows a deviation from Bloch's law.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
B. Mehdaoui, R. Moubah, B. Orayech, M. Bahout, O. Peña, M. Jáuregui, D. Saurel, A. El Bouari,