Abstract
With purpose to investigate influence of magnetically non-active metal layers on the Faraday effect in multilayer Ferromagnetic/Normal metal films, dependences of the Faraday rotation angles of the light polarization plane on magnetic field have been studied in multilayer [Co/Cu] nanofilms. It was revealed that the Faraday rotation φ varies with thickness of the Cu layers dCu. This φ(dCu) dependence consists of the monotonic component, namely a gradual rise of the angle with increase of dCu, and the non-monotonic one represented by two minima. The monotonic changes of the Faraday rotation were satisfactory described in frames of the effective medium method. Two minima are explained with the Co layer’s fragmentation due to influence of size electron quantization in the Cu layers on formation of Co clusters during deposition of the films.
Highlights
Multilayer epitaxial metallic nanofilms, which are widely used in different areas of information and sensor technology, continue to be promising objects for scientific study [1,2,3,4]
In a case of the Kerr effect the Ferromagnetic/Normal metal” (FM/NM) interfaces play a major role in formation of magnetooptical response, but for the Faraday effect the response is formed by the whole thickness of the FM layers
In this work we study the behavior of the Faraday effect in multilayer Co/Cu having different thickness of the Cu layers in order to determine mechanisms of influence of magnetically inactive metal layers on the Faraday effect in the magnetoresistive FM/NM nanofilms prepared by the magnetron sputtering
Summary
Multilayer epitaxial metallic nanofilms, which are widely used in different areas of information and sensor technology, continue to be promising objects for scientific study [1,2,3,4]. In our previous studies [14,15] of magnetoresistive properties and the magneto-optic longitudinal Kerr effect of the [Co/Cu(111)]m multilayers, obtained by the magnetron sputtering method, we found that the SPM clusters are smaller in the films, for which there is an antiferromagnetic exchange coupling between the Co layers. In a case of the Kerr effect the FM/NM interfaces play a major role in formation of magnetooptical response, but for the Faraday effect the response is formed by the whole thickness of the FM layers This circumstance allows to use the Faraday effect as a tool to get additional information about FM layers in multilayer films having a thickness up to tens of nanometers, at which they are still sufficiently transparent. In this work we study the behavior of the Faraday effect in multilayer Co/Cu having different thickness of the Cu layers in order to determine mechanisms of influence of magnetically inactive metal layers on the Faraday effect in the magnetoresistive FM/NM nanofilms prepared by the magnetron sputtering
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