Abstract
High-frequency (236 GHz) electron paramagnetic resonance (EPR) studies of Fe3+ ions at 255 K are reported in a Sn1−x Fe x O2 powder with x = 0.005, which is a ferromagnetic semiconductor at room temperature. The observed EPR spectrum can be simulated reasonably well as the overlap of spectra due to four magnetically inequivalent high-spin (HS) Fe3+ ions (S = 5/2). The spectrum intensity is calculated, using the overlap I(BL) + (I(HS1) + I(HS2) + I(HS3) + I(HS4)) × exp(−0.00001B), where B is the magnetic field intensity in Gauss, I represents the intensity of an EPR line (HS1, HS2, HS3, HS4), and BL stands for the baseline (the exponential factor, as found by fitting to the experimental spectrum, is related to the Boltzmann population distribution of energy levels at 255 K, which is the temperature of the sample in the spectrometer). These high-frequency EPR results are significantly different from those at X-band. The large values of the zero-field splitting parameter (D) observed here for the four centers at the high frequency of 236 GHz are beyond the capability of X-band, which can only record spectra of ions with much smaller D values than those reported here.
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Acknowledgments
This research was supported by Natural Sciences and Engineering Research Council (NSERC), Canada (S.K. Misra); National Institutes of Health and National Center for Research Resources (NIH/NCRR) Grant P41RR016292, USA (D. Tipikin and J.H. Freed); and ARO grant W911NF-09-1-0051 and National Science Foundation (NSF) grants Division of Materials Research DMR-0449639 and DMR-0840227 (A. Punnoose), NSF-Idaho-Experimental Program to Stimulate Competitive Research (EPSCoR) Program, and NSF EPS-0447689 and DMR-0321051 grants (A. Punnoose).
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Misra, S.K., Andronenko, S.I., Punnoose, A. et al. A 236 GHz Fe3+ EPR Study of Nanoparticles of the Ferromagnetic Room-Temperature Semiconductor Sn1−x Fe x O2 (x = 0.005). Appl Magn Reson 36, 291–295 (2009). https://doi.org/10.1007/s00723-009-0024-4
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DOI: https://doi.org/10.1007/s00723-009-0024-4