Scaling of quadratic and linear magneto-optic Kerr effect spectra with L21 ordering of Co2MnSi Heusler compound

Silber R, Král D, Stejskal O, Kubota T, Ando Y, Pištora J, Veis M, Hamrle J, Kuschel T (2020)
Applied Physics Letters 116(26): 262401.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Silber, RobinUniBi; Král, Daniel; Stejskal, Ondřej; Kubota, Takahide; Ando, Yasuo; Pištora, Jaromír; Veis, Martin; Hamrle, Jaroslav; Kuschel, TimoUniBi
Abstract / Bemerkung
Spectral ellipsometry is a useful technique allowing fast, nondestructive, and contactless characterization of thin films and constituent materials. In this Letter, we show that both the linear magneto-optic Kerr effect (LinMOKE, proportional to the magnetization M) and the quadratic MOKE (QMOKE, proportional to M2) can be a useful extension of spectral ellipsometry and are able to sense the crystallographic ordering of Heusler compounds. This is demonstrated for the Heusler compound Co2MnSi, which has a crystallographic transition from a B2 to an L21 structure with increasing annealing temperature T_a. We investigated a set of Co2MnSi thin films deposited on MgO(001) substrates and annealed from 300 to 500 °C. The amplitude of LinMOKE and QMOKE spectra, detected in the extended visible spectral range of 0.8–5.5 eV, scales linearly with T_a, and this effect is pronounced at the resonant peaks of the QMOKE spectra below 2.0 eV. Furthermore, the spectra of the magneto-optic (MO) parameters, which fully describe the MO response of Co2MnSi up to the second order in M, are obtained depending on T_a. Finally, the spectra are compared with ab initio calculations of a purely L21-ordered Co2MnSi Heusler compound.
Stichworte
Physics and Astronomy (miscellaneous)
Erscheinungsjahr
2020
Zeitschriftentitel
Applied Physics Letters
Band
116
Ausgabe
26
Art.-Nr.
262401
ISSN
0003-6951
eISSN
1077-3118
Page URI
https://pub.uni-bielefeld.de/record/2944580

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Silber R, Král D, Stejskal O, et al. Scaling of quadratic and linear magneto-optic Kerr effect spectra with L21 ordering of Co2MnSi Heusler compound. Applied Physics Letters. 2020;116(26): 262401.
Silber, R., Král, D., Stejskal, O., Kubota, T., Ando, Y., Pištora, J., Veis, M., et al. (2020). Scaling of quadratic and linear magneto-optic Kerr effect spectra with L21 ordering of Co2MnSi Heusler compound. Applied Physics Letters, 116(26), 262401. doi:10.1063/5.0008427
Silber, R., Král, D., Stejskal, O., Kubota, T., Ando, Y., Pištora, J., Veis, M., Hamrle, J., and Kuschel, T. (2020). Scaling of quadratic and linear magneto-optic Kerr effect spectra with L21 ordering of Co2MnSi Heusler compound. Applied Physics Letters 116:262401.
Silber, R., et al., 2020. Scaling of quadratic and linear magneto-optic Kerr effect spectra with L21 ordering of Co2MnSi Heusler compound. Applied Physics Letters, 116(26): 262401.
R. Silber, et al., “Scaling of quadratic and linear magneto-optic Kerr effect spectra with L21 ordering of Co2MnSi Heusler compound”, Applied Physics Letters, vol. 116, 2020, : 262401.
Silber, R., Král, D., Stejskal, O., Kubota, T., Ando, Y., Pištora, J., Veis, M., Hamrle, J., Kuschel, T.: Scaling of quadratic and linear magneto-optic Kerr effect spectra with L21 ordering of Co2MnSi Heusler compound. Applied Physics Letters. 116, : 262401 (2020).
Silber, Robin, Král, Daniel, Stejskal, Ondřej, Kubota, Takahide, Ando, Yasuo, Pištora, Jaromír, Veis, Martin, Hamrle, Jaroslav, and Kuschel, Timo. “Scaling of quadratic and linear magneto-optic Kerr effect spectra with L21 ordering of Co2MnSi Heusler compound”. Applied Physics Letters 116.26 (2020): 262401.
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