Laser-induced torques in metallic ferromagnets
Open accessAbstract
We study laser-induced torques in bcc Fe, hcp Co, and $L{1}_{0}$ FePt based on first-principles electronic structure calculations and the Keldysh nonequilibrium formalism. We find that the torques have two contributions, one from the inverse Faraday effect (IFE) and one from the optical spin-transfer torque (OSTT). Depending on the ferromagnet at hand and on the quasiparticle broadening the two contributions may be of similar magnitude, or one contribution may dominate over the other. Additionally, we determine the nonequilibrium spin polarization in order to investigate its relation to the torque. We find the torques and the perpendicular component of the nonequilibrium spin polarization to be odd in the helicity of the laser light, while the spin polarization that is induced parallel to the magnetization is helicity independent. The parallel component of the nonequilibrium spin polarization is orders of magnitude larger than the perpendicular component. In the case of hcp Co we find good agreement between the calculated laser-induced torque and a recent experiment.
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The ensuing optically-induced spin reorientation in an FM can be converted to a charge current in an FM/NM heterostructure, where symmetry breaking at the interface drives an interfacial spin photocurrent.
“The ensuing optically-induced spin reorientation in an FM can be converted to a charge current in an FM/NM heterostructure, where symmetry breaking at the interface drives an interfacial spin photocurrent, 136.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [136]
When a circularly polarized optical pulse impinges on an FM sample, the spin-orbit interaction can yield a pump-induced torque on the spin system, whose orientation depends on the relative orientation of the material magnetization and the optically-induced effective magnetic field arising from inverse Faraday and optical spin-transfer effects.
“When a circularly polarized optical pulse impinges on an FM sample, the spin-orbit interaction can yield a pump-induced torque on the spin system (Fig. 6a). The orientation of this torque depends on the relative orientation of the magnetization of the material and the optically-induced effective magnetic field, which can arise from inverse Faraday and optical spin-transfer effects135,136.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [136]
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References 48 · Cited by 60
Research works printed but not linked: 4
- [4]R. John, M. Berritta, D. Hinzke, C. M¨ uller, T. Santos, H. Ulrichs, P. Nieves, J. Walowski, R. Mondal, O. Chubykalo-Fesenko, et al., ArXiv e-prints (2016), 1606.08723.
- [13]G.-M. Choi, Ph.D. thesis, University of Illinois at Urbana-Champaign (2015).
- [16]M. Berritta, R. Mondal, K. Carva, and P. M. Oppeneer, ArXiv e-prints (2016), 1604.01188.
- [26]S. Wimmer, K. Chadova, M. Seemann, D. K¨ odderitzsch, and H. Ebert, ArXiv e-prints (2016), 1604.02798.
- Authors
- Freimuth, F., Blügel, S., & Mokrousov, Y.
- Affiliations
- Forschungszentrum Jülich (DE)
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2016-10-24
- Volume
- 94
- Issue
- 14
- ISSN
- 2469-9950 (ISSN-L)
- 2469-9969
- OpenAlex
- W2520174137
- Cited by
- 60
- References
- 48
- Citations by year
- 2026: 1 · 2025: 10 · 2024: 13 · 2023: 7 · 2022: 5 · 2021: 8 · 2020: 5 · 2019: 1 · 2018: 3 · 2017: 7
- FWCI
- 1.73
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Physical review. B./Physical review. B (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- JuSER (Forschungszentrum Jülich) (submittedVersion, other-oa)
- arXiv (Cornell University)
- Funders
- Deutsche Forschungsgemeinschaft (SPP 1538)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Magnetic properties of thin films
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Keywords
- spin-transfer torque, inverse Faraday effect, alpha-iron, hcp cobalt, L10-FePt, ferromagnetic metals
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