Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation

Silber R, Tomíčková M, Rodewald J, Wollschläger J, Pištora J, Veis M, Kuschel T, Hamrle J (2018)
Photonics and Nanostructures - Fundamentals and Applications 31: 60-65.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Silber, RobinUniBi; Tomíčková, Michaela; Rodewald, Jari; Wollschläger, Joachim; Pištora, Jaromír; Veis, Martin; Kuschel, TimoUniBi ; Hamrle, Jaroslav
Abstract / Bemerkung
In most of the cases the magnetooptic Kerr effect (MOKE) techniques rely solely on the effects linear in magnetization (M). Nevertheless, a higher-order term being proportional to M^2 and called quadratic MOKE (QMOKE) can additionally contribute to experimental data. Handling and understanding the underlying origin of QMOKE could be the key to utilize this effect for investigation of antiferromagnetic materials in the future due to their vanishing first order MOKE contribution. Also, better understanding of QMOKE and hence better understanding of magnetooptic (MO) effects in general is very valuable, as the MO effect is very much employed in research of ferro- and ferrimagnetic materials. Therefore, we present our QMOKE and longitudinal MOKE spectroscopy setup with a spectral range of 0.8–5.5 eV. The setup is based on light modulation through a photoelastic modulator and detection of second-harmonic intensity by a lock-in amplifier. To measure the Kerr ellipticity an achromatic compensator is used within the setup, whereas without it Kerr rotation is measured. The separation of QMOKE spectra directly from the measured data is based on measurements with multiple magnetization directions. So far the QMOKE separation algorithm is developed and tested for but not limited to cubic (001) oriented samples. The QMOKE spectra yielded by our setup arise from two quadratic MO parameters Gs and 2G44, being elements of quadratic MO tensor G, which describes perturbation of the permittivity tensor in the second order in M.
Erscheinungsjahr
2018
Zeitschriftentitel
Photonics and Nanostructures - Fundamentals and Applications
Band
31
Seite(n)
60 - 65
ISSN
1569-4410
Page URI
https://pub.uni-bielefeld.de/record/2920256

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Silber R, Tomíčková M, Rodewald J, et al. Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation. Photonics and Nanostructures - Fundamentals and Applications. 2018;31:60-65.
Silber, R., Tomíčková, M., Rodewald, J., Wollschläger, J., Pištora, J., Veis, M., Kuschel, T., et al. (2018). Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation. Photonics and Nanostructures - Fundamentals and Applications, 31, 60-65. doi:10.1016/j.photonics.2018.05.007
Silber, R., Tomíčková, M., Rodewald, J., Wollschläger, J., Pištora, J., Veis, M., Kuschel, T., and Hamrle, J. (2018). Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation. Photonics and Nanostructures - Fundamentals and Applications 31, 60-65.
Silber, R., et al., 2018. Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation. Photonics and Nanostructures - Fundamentals and Applications, 31, p 60-65.
R. Silber, et al., “Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation”, Photonics and Nanostructures - Fundamentals and Applications, vol. 31, 2018, pp. 60-65.
Silber, R., Tomíčková, M., Rodewald, J., Wollschläger, J., Pištora, J., Veis, M., Kuschel, T., Hamrle, J.: Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation. Photonics and Nanostructures - Fundamentals and Applications. 31, 60-65 (2018).
Silber, Robin, Tomíčková, Michaela, Rodewald, Jari, Wollschläger, Joachim, Pištora, Jaromír, Veis, Martin, Kuschel, Timo, and Hamrle, Jaroslav. “Quadratic magnetooptic spectroscopy setup based on photoelastic light modulation”. Photonics and Nanostructures - Fundamentals and Applications 31 (2018): 60-65.
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