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Quadratic magnetooptic Kerr effect spectroscopy of Fe epitaxial films on MgO(001) substrates
- Publication Year :
- 2019
- Publisher :
- arXiv, 2019.
-
Abstract
- The magnetooptic Kerr effect (MOKE) is a well known and handy tool to characterize ferro-, ferri- and antiferromagnetic materials. Many of the MOKE techniques employ effects solely linear in magnetization $\bm{M}$. Nevertheless, a higher-order term being proportional to $\bm{M}^2$ and called quadratic MOKE (QMOKE) can additionally contribute to the experimental data. Here, we present detailed QMOKE spectroscopy measurements in the range of 0.8 -- 5.5\,eV based on a modified 8-directional method applied on ferromagnetic bcc Fe thin films grown on MgO substrates. From the measured QMOKE spectra, two further complex spectra of the QMOKE parameters $G_s$ and $2G_{44}$ are yielded. The difference between those two parameters, known as $\Delta G$, denotes the strength of the QMOKE anisotropy. Those QMOKE parameters give rise to the QMOKE tensor $\bm{G}$, fully describing the perturbation of the permittivity tensor in the second order in $\bm{M}$ for cubic crystal structures. We further present experimental measurements of ellipsometry and linear MOKE spectra, wherefrom permittivity in the zeroth and the first order in $\bm{M}$ are obtained, respectively. Finally, all those spectra are described by ab-initio calculations.<br />Comment: 15 pages + references, , 15 Figures
- Subjects :
- Permittivity
Kerr effect
Materials science
Condensed matter physics
FOS: Physical sciences
02 engineering and technology
Cubic crystal system
021001 nanoscience & nanotechnology
01 natural sciences
Magnetization
Condensed Matter::Materials Science
Magneto-optic Kerr effect
Ab initio quantum chemistry methods
0103 physical sciences
Antiferromagnetism
010306 general physics
0210 nano-technology
Anisotropy
Physics - Optics
Optics (physics.optics)
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....c9eed63385e36760fc780e94582edc0e
- Full Text :
- https://doi.org/10.48550/arxiv.1904.13121