Title: Magnetic properties of nanoporous Si powder

Authors: A.V. Brodovoi, S.G. Bunchuk, V.V. Pokropivny, V.V. Skorokhod

Addresses: Frantsevich Institute for Problems of Materials Science of NASU, Krzhyzhanovsky 3, Kiev 03142, Ukraine. ' Lashkarev Institute of Semiconductor Physics of NASU, Kiev, Ukraine. ' Frantsevich Institute for Problems of Materials Science of NASU, Krzhyzhanovsky 3, Kiev 03142, Ukraine. ' Frantsevich Institute for Problems of Materials Science of NASU, Krzhyzhanovsky 3, Kiev 03142, Ukraine

Abstract: Results of magnetic susceptibility and electron paramagnetic resonance studies of porous silicon powder (g = 2.0055) obtained by electrochemical technique are presented. In comparison with diamagnetic bulk Si (χ_d = –2.29 × 10–7 cm³/g), the porous Si powder exhibits paramagnetic properties (χ_p = 1.1 × 10–5 cm³/g) with weak share of ferromagnetism (χ_f = 1.85 × 10–5 cm³/g). Centres of |dangling covalent bonds| type on the surface of silicon nanocrystals were registered to be responsible for the EPR spectra. In suggestion of uniform distribution of the paramagnetic centres in powder bulk its density was estimated to be 3.5 × 1022 cm^-3.

Keywords: nanosilicon; magnetic susceptibility; electron paramagnetic spectrum; ferromagnetism; nanotechnology; magnetic properties; nanoporous silicon powder; silicon nanocrystals.

DOI: 10.1504/IJNT.2006.008720

International Journal of Nanotechnology, 2006 Vol.3 No.1, pp.57 - 62

Published online: 18 Jan 2006 *

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