Mediate Influence of the Quantum Size Effect in Multilayered Co / Cu (111) Nanofilms on the Longitudinal Kerr Effect

Authors I.M. Lukienko1, M.F. Kharchenko1, O.M. Stetsenko2

1B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47, Nauky Ave., 61103 Kharkiv, Ukraine

2National Technical University “Kharkov Polytechnical Institute”, 2, Kyrpychov Str., 61002 Kharkiv, Ukraine

Issue Volume 10, Year 2018, Number 6
Dates Received 14 August 2018; revised manuscript received 29 November 2018, published online 18 December 2018
Citation I.M. Lukienko, M.F. Kharchenko, O.M. Stetsenko, J. Nano- Electron. Phys. 10 No 6, 06041 (2018)
PACS Number(s) 78.67.Pt, 61.46. – w, 78.67.Bf, 73.21. – b
Keywords Multilayered Co/Cu nanofilms, Magnetooptical Kerr effect, Superparamagnetic clusters, Quantum size effect.

In the work, dependences of the Kerr rotation angles on magnetic field strength ((H) at the longitudinal Kerr effect in multilayer nano films [Co (0.8 nm) / Cu (111)]20 with different thickness of copper layers were analyzed with taking into account presence of superparamagnetic cobalt atoms clusters in the films. Magnetic moments of superparamagnetic particles were determined from approximation of ((H) dependencies by Langevin functions with taking into account Log-normal distributions for magnetic moments of SPM clusters. It is found that sizes of superparamagnetic clusters are reduced in the films where there are antiferromagnetic exchange bonds between layers of cobalt. It is shown that reduction of superparamagnetic cluster sizes is accompanied with increase of their total volume in cobalt layers. It is concluded that the regularities are caused by influence of electron density redistribution in the copper layers under action of the electron quantum size effect in the process of films producing.

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