Defect-induced high-temperature ferromagnetism in Si1-xMnx(x ≈ 0.52−0.55) alloys

V. V. Rylkov; E. A. Gan'shina; O. A. Novodvorskii; S. N. Nikolaev; A. I. Novikov; E. T. Kulatov; V. V. Tugushev; A. B. Granovskii; V. Ya. Panchenko

doi:10.1209/0295-5075/103/57014

All issues

Volume 103 / No 5 (September 2013)

EPL, 103 5 (2013) 57014

Abstract

Issue		EPL Volume 103, Number 5, September 2013


Article Number		57014
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/103/57014
Published online		02 October 2013

EPL, 103 (2013) 57014

Defect-induced high-temperature ferromagnetism in Si_1-xMn_x(x ≈ 0.52−0.55) alloys

V. V. Rylkov¹, E. A. Gan'shina², O. A. Novodvorskii³, S. N. Nikolaev¹, A. I. Novikov², E. T. Kulatov⁴^(a), V. V. Tugushev¹^,4, A. B. Granovskii² and V. Ya. Panchenko³

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

^(a) kulatov@td.lpi.ru

Received: 2 August 2013
Accepted: 4 September 2013

Abstract

We present a comparative study of the anomalous Hall effect (AHE) and of the transverse Kerr effect (TKE) in the nonstoichiometric $\text{Si}_{1-x}\text{Mn}_x\ (x\approx 0.52\text{--}0.55)$ 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 $\text{Si}_{1-x}\text{Mn}_x\ (x \approx 0.52\text{--}0.55)$ 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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