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Optical and Magnetooptical Properties of Multilayer and Granular Films

  • Conference paper
Frontiers in Magnetism of Reduced Dimension Systems

Part of the book series: NATO ASI Series ((ASHT,volume 49))

Abstract

Surface and thin-film magnetism represents a rapidly developing area of materials research due to observation of new phases and new effects in ultra thin layered structures.

The ability to make atomically flat layers with sharp interfaces and continuous thickness variations permits new insights into relationships between structural, electronic and magnetic properties. The general purpose of our work is to show, what information about the changes in the electronic and magnetic structure of solids the magnetooptical methods can give as one goes from bulk samples to thin films, superlattices and granular films.

The lecture concerns the problems arising in investigation of optical and magnetooptical (MO) properties of ultrathin multilayer (ML) and granular magnetic films. The available experimental results in this field are reviewed and analyzed. The MO effects in these low-dimensional structures (the thickness of layers is less than 25 Å) are shown to be essentially different from the results obtained on bulk samples. The MO effects are divided into 4 groups according to their experimental behavior:

  1. 1.

    MO effects caused by the plasma enhancement (FM/TM, where FM=Fe, Co; TM=Ag, Au, Cu)

  2. 2.

    MO effects due to spin polarization by proximity effect (hybridization effect and interfacial states)

  3. 3.

    MO effects oscillating with variation of the non-magnetic layer thickness (FM/PM/FM)

  4. 4.

    MO effects oscillating with variation of the magnetic layer thickness (PM/FM/PM)

The observed oscillations with the period 5–10 Å in the MO effect versus thickness of layers plots are considered as a manifestation of the classical and quantum size effects. The possible theoretical explanations of these oscillations are based on formation of the quantum-well states in ultrathin films.

The experimental results on the giant non-linear MO effects in ML films are discussed.

The results of the experimental and theoretical investigation of optical and MO spectra for series of granular alloys CoxCu1-x,CoxAg1-x, (Co70Fe30)xAg1-x are presented.

We demonstrated that these spectra strongly depend on the granular and matrix material, the concentration and shape of the granules, the annealing temperature. To explain this complex behavior we calculated the MO spectra of this granular alloys in the framework of the effective medium approximation. The calculated spectra are in qualitative agreement with experimental data, that allows us to make some conclusion about magnetic microstructures of these alloys.

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Authors and Affiliations

  1. Physics Department Lomonosov, Moscow State University, Moscow, 119899, Russia

    E. A. Gan’shina

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  1. E. A. Gan’shina
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Editors and Affiliations

  1. Institute of Magnetism of National Academy of Sciences of Ukraine, 36b Vernadski Srt., 252142, Kiev, Ukraine

    Victor G. Bar’yakthar  & Natalia A. Lesnik  & 

  2. Department of Physics, Ohio State University, 174W. 18th Avenue, 43210-1106, Columbus, Ohio, USA

    Philip E. Wigen

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Gan’shina, E.A. (1998). Optical and Magnetooptical Properties of Multilayer and Granular Films. In: Bar’yakthar, V.G., Wigen, P.E., Lesnik, N.A. (eds) Frontiers in Magnetism of Reduced Dimension Systems. NATO ASI Series, vol 49. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5004-0_21

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  • DOI: https://doi.org/10.1007/978-94-011-5004-0_21

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-6101-8

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