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No.1(pp.1-34)

Home > Issues > Volume 13 (2008) > No.1(pp.1-34)

Characteristics of Mn_sSi_1-sTe Compound Studied by Electron Magnetic Resonance and Other Experiments

Journal of Magnetics, Volume 13, Number 1, 31 Mar 2008, Pages 23-29

Sung-Ho Na*

(Department of Physics, Pusan National University), Heung-Chul Kim(Department of Physics, Pusan National University), Jung-Woo Park(Department of Physics, Pusan National University), Jang-Whan Kim(Department of Physics, Pusan National University)

Abstract

The magnetic and other physical characteristics of Mn_sSi_1-sTe have been investigated by electron magnetic resonance (EMR), X-ray diffraction (XRD) and other experiments. Mn_sSi_1-sTe is found to have corundum structure for manganese contents up to 10% and also to be ferromagnetic for temperatures below 80 K. While ferromagnetic resonance signal coexists with the usual paramagnetic resonance signal, invariance of the g-factor inferred from the electron paramagnetic resonance signals throughout all temperature ranges clearly confirms that the manganese ions are in the electronic 3d⁵ state. The temperature dependence of EMR line-width is the same as other diluted magnetic semiconductors. From the EMR signals relaxation times T₂andT₁ of Mn_sSi_1-sTe compounds are estimated to be about 4.4×10^-10_sand 9.3×10^-8_srespectively and are found to vary slightly with temperature or composition change. Exchange narrowing of the EMR line-width becomes dominant for the sample in which the substitution ratio, x = 30%. For one sample, in which x = 0.5%, spin glass-like behavior is indicated by EMR signals for temperatures lower than 60 K. This behavior may authentic for samples within a certain range of x.

Keywords: electron magnetic resonance; ferromagnetism; EMR line-width; g-factor; diluted magnetic semiconductor; spin glass

DOI: 10.4283/JMAG.2008.13.1.23

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