Aronzon, B. A. and Rylkov, V. V. and Nikolaev, S. N. and Tugushev, V. V. and Caprara, S. and Podolskii, V. V. and Lesnikov, V. P. and Lashkul, A. and Laiho, R. and Gareev, R. R. and Perov, N. S. and Semisalova, A. S. (2011) Room-temperature ferromagnetism and anomalous Hall effect in Si1-xMnx (x approximate to 0.35) alloys. PHYSICAL REVIEW B, 84 (7): 075209. ISSN 1098-0121, 1550-235X
Full text not available from this repository. (Request a copy)Abstract
A detailed study of the magnetic and transport properties of Si1-xMnx (x approximate to 0.35) films is presented. We observe the anomalous Hall effect in these films up to room temperature. The results of the magnetic measurements and the anomalous Hall effect data are consistent and demonstrate the existence of long-range ferromagnetic order in the systems under investigation. A correlation of the anomalous Hall effect and the magnetic properties of the samples with their conductivity and substrate type is shown. A theoretical model based on the idea of a two-phase magnetic material, in which molecular clusters with localized magnetic moments are embedded in the matrix of a weak itinerant ferromagnet, is discussed and used to explain experimental results. The long-range ferromagnetic order at high temperatures is mainly due to the Stoner enhancement of the exchange coupling between clusters through thermal spin fluctuations ("paramagnons") in the matrix. Theoretical predictions do not contradict experimental data when model parameters of a plausible order of magnitude are used.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MAGNETIC SEMICONDUCTORS; SILICON; MANGANESE; MN4SI7; FILMS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Christian Back |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Jun 2020 05:31 |
| Last Modified: | 03 Jun 2020 05:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/20400 |
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