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Vector-magneto-optical generalized ellipsometry.

K Mok1, N Du, H Schmidt

  • 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden, Germany. kelvinmok@hzdr.de

The Review of Scientific Instruments
|April 5, 2011
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Summary

We developed a variable-angle vector-magneto-optical generalized ellipsometer (VMOGE) for magnetic material analysis. This instrument enables precise determination of magneto-optical properties in multilayer samples without sample manipulation.

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Area of Science:

  • Magneto-optics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Ellipsometry is a powerful technique for characterizing thin films and surfaces.
  • Magneto-optical effects are crucial for understanding magnetic materials and their applications.
  • Existing techniques often require sample manipulation for magnetic field vector control.

Purpose of the Study:

  • To introduce a novel variable-angle vector-magneto-optical generalized ellipsometer (VMOGE).
  • To enable comprehensive characterization of magnetic properties in multilayer samples.
  • To determine the magneto-optical dielectric tensor of materials under arbitrary magnetic fields.

Main Methods:

  • Utilizing an octupole magnet for magnetic field generation up to 0.4 T.
  • Implementing a variable-angle setup for measurements across a spectral range of 300-1100 nm.
  • Employing a 4x4 matrix formalism for data analysis and model fitting.

Main Results:

  • Demonstrated VMOGE measurements of the Mueller matrix submatrix under variable magnetic fields.
  • Introduced "field orbit" measurements, eliminating the need for sample repositioning.
  • Successfully determined the magneto-optical dielectric tensor of multilayer samples.

Conclusions:

  • The developed VMOGE system offers advanced capabilities for magnetic material characterization.
  • The technique allows for in-situ determination of magneto-optical tensor components.
  • Comparison with vector magnetometer data yields anisotropic magneto-optical coupling constants.