Electron paramagnetic resonance and low-field microwave absorption in the manganese–gallium oxide

• Published in: Journal of magnetism and magnetic materials Vol. 385; pp. 188 - 192
• Main Authors: Montiel, H., Alvarez, G., Conde-Gallardo, A., Zamorano, R.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2015
• Subjects: Antiferromagnetism; Electron paramagnetic resonance; Fluctuation; Low-field microwave absorption; Magnetic transition; Magnetism; Microwave absorption; Oxides; Spinel-type oxide; Temperature dependence; X-band; Spinel-type oxide; Electron paramagnetic resonance; Low-field microwave absorption; Magnetic transition
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2015.03.007

Microwave absorption measurements in MnGa2O4 powders are carried out at X-band (8.8–9.8GHz) in 92–296K temperature range. For all temperatures, the electron paramagnetic resonance (EPR) spectra show a single broad line due to Mn2+ ions. Temperature dependence of the EPR parameters: the peak-to-peak linewidth (ΔHpp), the integrated intensity (IEPR) and the g-factor, suggests the presence of magnetic fluctuations that precede to antiferromagnetic ordering at low temperature. Additionally, the low-field microwave absorption (LFMA) is used to give further information on this material, giving also evidence of these magnetic fluctuations. •We have investigated the microwave absorption in MnGa2O4 powders in 92–296K temperature range.•EPR spectra suggest the presence of magnetic fluctuations that proceed to antiferromagnetic ordering at low temperature.•LFMA signal give also evidence of these magnetic fluctuations.