Magnetic ordering effects in heavily doped GaAs:Fe crystals
| Autor: | E. G. Apushkinskii, B. P. Popov, V. P. Savel’ev, V. K. Sobolevskii |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Materials science
Condensed matter physics Condensed Matter::Other Transition temperature Doping Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Condensed Matter::Materials Science Ferromagnetism Impurity law Coupling (piping) Condensed Matter::Strongly Correlated Electrons Electron paramagnetic resonance Superparamagnetism |
| Zdroj: | Semiconductors. 39:493-498 |
| ISSN: | 1090-6479 1063-7826 |
| DOI: | 10.1134/1.1923553 |
| Popis: | The exchange coupling of Fe centers in GaAs crystals is studied by electron spin resonance (ESR). Transitions to a superparamagnetic state and to an impurity ferromagnetism domain are analyzed. A study of a system of single-domain magnetically ordered regions in GaAs:Fe with the transition to a ferromagnetic state occurring at the temperature TC1 = 460 K is described. It is shown that impurity ferromagnetism with a transition temperature TC2 of 60 K in a disordered system of Fe centers randomly distributed among superparamagnetic regions exists in GaAs:Fe. |
| Databáze: | OpenAIRE |
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