Influence of impurities and defects on the nuclear relaxation in YIG films
Autor: | J. Englich, Pavel Novák, H. Lütgemeier, H. Dötsch, K. Wagner, Karel Nitsch, R. Gerhardt, Miroslav Kučera, W. Zinn |
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Rok vydání: | 1996 |
Předmět: |
Materials science
Condensed matter physics Doping Near-infrared spectroscopy Relaxation (NMR) Yttrium iron garnet Condensed Matter Physics Epitaxy Electronic Optical and Magnetic Materials Ion Condensed Matter::Materials Science chemistry.chemical_compound Nuclear magnetic resonance chemistry Impurity Absorption (chemistry) |
Zdroj: | Journal of Magnetism and Magnetic Materials. 161:57-64 |
ISSN: | 0304-8853 |
DOI: | 10.1016/s0304-8853(96)00041-8 |
Popis: | The relaxation of 57Fe nuclei in yttrium iron garnet (YIG) is very sensitive to the way in which charge compensation is achieved in these magnetic insulators. Charge compensation becomes necessary either if nontrivalent impurities are incorporated in the garnet structure or in the presence of intrinsic defects. From measurements of the nuclear relaxation times T1 and T2 in epitaxial YIG films doped with small amounts of Ca, Si or Pb, we conclude that the relaxation behavior at low temperatures depends critically on the presence of certain intrinsic defects, namely Fe2+. These ions also increase the optical absorption in the near infrared. |
Databáze: | OpenAIRE |
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