High temperature magnetism and microstructure of ferromagnetic alloy Si1−xMnx

Aronzon, B.A.; Davydov, A.B.; Vasiliev, A.L.; Perov, N.S.; Novodvorsky, O.A.; Parshina, L.S.; Presniakov, M.Y.; Lahderanta, E.

Авторы: Aronzon B.A., Davydov A.B., Vasiliev A.L., Perov N.S., Novodvorsky O.A., Parshina L.S., Presniakov M.Yu, Lahderanta E.
Журнал: Journal of Physics Condensed Matter
Том: 29
Номер: 5
Год издания: 2017
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 055802-1
Последняя страница: 055802-10
DOI: 10.1088/1361-648X/29/5/055802
Аннотация: The results of a detailed study of magnetic properties and of the microstructure of SiMn films with a small deviation from stoichiometry are presented. The aim was to reveal the origin of the high temperature ferromagnetic ordering in such compounds. Unlike SiMn single crystals with the Curie temperature ~30 K, considered Si1−xMnx compounds with x = 0.5 +Δx and Δx in the range of 0.01–0.02 demonstrate a ferromagnetic state above room temperature. Such a ferromagnetic state can be explained by the existence of highly defective B20 SiMn nanocrystallites. These defects are Si vacancies, which are suggested to possess magnetic moments. The nanocrystallites interact with each other through paramagnons (magnetic fluctuations) inside a weakly magnetic manganese silicide matrix giving rise to a long range ferromagnetic percolation cluster. The studied structures with a higher value of Δx ≈ 0.05 contained three different magnetic phases: (a)—the low temperature ferromagnetic phase related to SiMn; (b)—the above mentioned high temperature phase with Curie temperature in the range of 200–300 K depending on the growth history and (c)—superparamagnetic phase formed by separated noninteracting SiMn nanocrystallites
Добавил в систему: Перов Николай Сергеевич

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