Low Temperature Physics: 40, 165 (2014); https://doi.org/10.1063/1.4865570
Fizika Nizkikh Temperatur: Volume 40, Number 2 (February 2014), p. 211-218    ( to contents , go back )

Unidirectional anisotropy in planar arrays of iron nanowires: ferromagnetic resonance study

D.M. Polishchuk, A.I. Tovstolytkin

Institute of Magnetism, 36-b Vernadskogo Blvd., Kyiv 03142, Ukraine
E-mail: atov@imag.kiev.ua

S.K. Arora, B.J. O’Dowd, and I.V. Shvets

Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and School of Physics Trinity College Dublin, Dublin 2, Ireland
pos Анотація:

Received August 7, 2013, revised September 10, 2013

Abstract

Ferromagnetic resonance in planar arrays of MgO capped iron nanowires (NW) has been studied as a function of sample aging time. The planar NW arrays were grown on a stepped vicinal surface of oxidized Si (111) substrates by means of low-angle molecular beam epitaxy. The ferromagnetic resonance measurements revealed a perpendicular unidirectional anisotropy, which became more pronounced with increasing the sample aging time. It is concluded that the observed effects originate from oxidation of iron and formation of antiferromagnetic regions in the vicinity of the Fe/MgO interface.

PACS: 81.07.Gf Nanowires;
PACS: 75.30.Gw Magnetic anisotropy;
PACS: 75.75.–c Magnetic properties of nanostruc-tures;
PACS: 75.70.Cn Magnetic properties of interfaces (multilayers, interfaces, heterostructures).

Key words: exchange bias, unidirectional magnetic ani-sotropy, nanowires, ferromagnetic resonance.

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