Spectral reflectivity crossover at the metamagnetic transition in FeRh thin films
| Autor: | Igor Mazin, Marc Currie, O. M. J. van ‘t Erve, Steven Bennett |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Kerr effect Condensed matter physics Magnetism 02 engineering and technology Electronic structure Neutron scattering 021001 nanoscience & nanotechnology 01 natural sciences Electronic Optical and Magnetic Materials law.invention 010309 optics SQUID law 0103 physical sciences First principle Antiferromagnetism Scanning tunneling microscope 0210 nano-technology |
| Zdroj: | Optical Materials Express. 9:2870 |
| ISSN: | 2159-3930 |
| Popis: | Metamagnetic transition in FeRh has been subject to many investigations. Several methods have been employed to address various characteristics as they change across this transition, such as SQUID magnetometry, neutron scattering, electrical transport, synchrotron X-rays, scanning tunneling microscopy, magneto-optic Kerr effect, etc. In this paper we investigate the frequency dependent reflectance, which is a fast and easy probe, to find clear and distinct signatures of this transition. To this end, our first principle calculations reveal that the dramatic difference in electronic structure between the ferro- and antiferromagnetic phases of FeRh leads to a characteristic crossover in the energy dependence whereby the reflectivity difference between the two phases changes sign at E=∼0.79 eV (1400 nm). To verify these predictions, we have measured the optical reflectance of FeRh thin films across the metamagnetic transition, and found a close agreement with the predicted effect. These measurements not only confirm the calculated electronic structure of FeRh, but also reveal an effect that can be used for a fast and easy direct detection of the transition by probing the crossover optically in energy space, without resorting to complicated magneto optical probes which only show a signature of the surface magnetism. This also may be used as a unique probe of the dynamics of carriers by temporal studies in different regions, (from energies near the relaxation frequency to those above the plasma frequency). |
| Databáze: | OpenAIRE |
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