Volume 103, Number 5, September 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||02 October 2013|
Defect-induced high-temperature ferromagnetism in Si1-xMnx(x ≈ 0.52−0.55) alloys
1 National Research Centre “Kurchatov Institute” - 123182 Kurchatov sq. 1, Moscow, Russia
2 Lomonosov Moscow State University, Faculty of Physics - 119991 Leninskie Gory, Moscow, Russia
3 Institute on Laser and Information Technologies, Russian Academy of Sciences - 140700 Svyatoozerskaya str. 1, Shatura, Moscow region, Russia
4 Prokhorov General Physics Institute, Russian Academy of Sciences - 119991 Vavilov str. 38, Moscow, Russia
Received: 2 August 2013
Accepted: 4 September 2013
We present a comparative study of the anomalous Hall effect (AHE) and of the transverse Kerr effect (TKE) in the nonstoichiometric alloys. The data on AHE and TKE are consistent with each other and clearly indicate the intrinsic above room-temperature ferromagnetic order in the studied samples. We argue that this order is not produced by the phase segregation effects, but rather has a global character, while even a small level of the nonstoichiometry in alloys drastically changes their magnetic, electrical, optical and magneto-optical properties as compared to those of the stoichiometric manganese monosilicide MnSi. We propose a qualitative explanation of the obtained experimental results in the frame of the model of defect-induced ferromagnetic order using the first-principles calculations of the electronic and magnetic structure of the system.
PACS: 71.20.-b – Electron density of states and band structure of crystalline solids / 75.47.-m – Magnetotransport phenomena; materials for magnetotransport / 78.20.-e – Optical properties of bulk materials and thin films
© EPLA, 2013
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