MnSi$_{1.7}$ nanoparticles embedded in Si: Superparamagnetism with a collective behavior

Details MnSi$_{1.7}$ nanoparticles embedded in Si: Superparamagnetism with a collective behavior MnSi$_{1.7}$ nanoparticles embedded in Si: Superparamagnetism with a collective behavior

2009-08-20

arxiv.org/abs/0908.2906v3

Phys. Rev. B 80, 174423 (2009)

Physics

Condensed Matter

Materials Science

11 pages, 6 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.80.174423

The doping of Mn in Si is attracting research attentions due to the possibility to fabricate Si-based diluted magnetic semiconductors. However, the low solubility of Mn in Si favors the precipitation of Mn ions even at non-equilibrium growth conditions. MnSi$_{1.7}$ nanoparticles are the common precipitates, which show exotic magnetic properties in comparison with the MnSi$_{1.7}$ bulk phase. In this paper we present the static and dynamic magnetic properties of MnSi$_{1.7}$ nanoparticles. Using the Preisach model, we derive the magnetic parameters, such as the magnetization of individual particles, the distribution of coercive fields and the inter-particle interaction field. Time-dependent magnetization measurements reveal a spin-glass behavior of the system.

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