Low Temperature Physics: 38, 848 (2012); https://doi.org/10.1063/1.4752100 (6 pages)
Fizika Nizkikh Temperatur: Volume 38, Number 9 (September 2012), p. 1069-1076    ( to contents , go back )

Decreasing of superparamagnetic clusters in [Co/Cu(111)]n nanofilms, induced by quantum size effect

I.M. Lukienko, N.F. Kharchenko, V.M. Khrustalyov, V.M. Savytskiy, A.V. Fedorchenko, V.A. Desnenko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: lukijenko@ilt.kharkov.ua

A.N. Stetsenko, and V.V. Zorchenko

National Technical Institute "KhPI" 21 Frunze Str., Kharkiv 61002, Ukraine
pos Анотація:

Received Jule 4, 2012

Abstract

It is known, that the quantum size effects are important factors for formation of morphological peculiarities of metal nanofilms during their growing. The regularities in the behavior of superparamagnetic magnetoresistive effect in the Co/Cu(111) nanofilms in magnetic field, observed in the experiment under consideration point to the influence of electron size effect on cluster formation in these films. The experimental data on high-field magnetoresistive effect in the [Co/Cu(111)]20 multilayer nanofims are reported. The films had the fixed Co layer thicknesses and a varying Cu layer thicknesses in different films. It is found that the effective sizes of superparamagnetic formations in the films, with a Cu layer thicknesses, corresponding to maxima of antiferromagnetic coupling between the Co layers are decreased. It is supposed, that the observed “grinding” of smaller superparamagnetic particles is caused by oscillating variations of electron density in the Co/Cu interface layer, induced by the quantum size effect in the Cu layers.

PACS: 73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects);
PACS: 75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures);
PACS: 75.20.–g Diamagnetism, paramagnetism,and superparamagnetism.

Key words: magnetoresistive effect, quantum size effect, superparamagnetic clusters, "electronic growth" of films, multilayer nanofilms, Co/Cu(111).

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