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Magnetization reversal measurements in mesoscopic amorphous magnets by magneto-optical Kerr effect

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  • R. Morales
  • J. Martín
  • M. Vélez
  • J. Alameda

Abstract

A magneto-optical setup based on the transverse Kerr effect has been designed to study the magnetization reversal processes by vector magnetometry in arrays of magnetic nanostructures with a reduced total volume. This system allows the measurement of both the parallel and perpendicular to the field components of the magnetization. It has been used to analyze the behavior of amorphous Co x Si 1-x lines fabricated by electron beam lithography that present a very well defined shape induced uniaxial anisotropy. When the field is applied near to the hard direction, coherent rotation processes are found to occur with a collapse of this reversal mode at fields very close to the hard axis that allows to estimate the very low anisotropy dispersion of these samples. The analysis of the vector hysteresis loops reveals that the magnetization switches via an incoherent process that starts prior to the Stoner-Wohlfarth instability and that can be described in terms of a localized curling-like reversal mode. Copyright Springer-Verlag Berlin/Heidelberg 2004

Suggested Citation

  • R. Morales & J. Martín & M. Vélez & J. Alameda, 2004. "Magnetization reversal measurements in mesoscopic amorphous magnets by magneto-optical Kerr effect," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 40(4), pages 463-470, August.
    • Handle: RePEc:spr:eurphb:v:40:y:2004:i:4:p:463-470
    DOI: 10.1140/epjb/e2004-00285-7
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