Abstract
Electron paramagnetic resonance (EPR) spectroscopy is very sensitive to paramagnetic (PM) defect centers and is widely used to monitor the magnetic ordering of various PM species. Because the line width and intensity of the EPR spectrum are related to the magnetic ordering of the PM species, temperature variation of EPR spectra provides a wealth of information about the presence of ferromagnetic ordering in the sample. This chapter focuses on PM anionic and cationic vacancies in many oxide-based compounds, which can cause dilute ferromagnetism. Furthermore, EPR spectroscopy provides information about the transformation of various defect centers, which has a direct impact on the magnetic properties.
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