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Ab Initio Theory of Coherent Laser-Induced Magnetization in Metals

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2016

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Berritta, Marco
Carva, Karel
Oppeneer, Peter M.

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https://doi.org/10.1103/PhysRevLett.117.137203
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http://arxiv.org/abs/1604.01188v2

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Physical Review Letters. 2016, 117(13), 137203. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.117.137203

Zusammenfassung

We present the first materials specific ab initio theory of the magnetization induced by circularly polarized laser light in metals. Our calculations are based on nonlinear density matrix theory and include the effect of absorption. We show that the induced magnetization, commonly referred to as inverse Faraday effect, is strongly materials and frequency dependent, and demonstrate the existence of both spin and orbital induced magnetizations which exhibit a surprisingly different behavior. We show that for nonmagnetic metals (such as Cu, Au, Pd, Pt) and antiferromagnetic metals the induced magnetization is antisymmetric in the light's helicity, whereas for ferromagnetic metals (Fe, Co, Ni, FePt) the imparted magnetization is only asymmetric in the helicity. We compute effective optomagnetic fields that correspond to the induced magnetizations and provide guidelines for achieving all-optical helicity-dependent switching.

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530 Physik

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ISO 690BERRITTA, Marco, Ritwik MONDAL, Karel CARVA, Peter M. OPPENEER, 2016. Ab Initio Theory of Coherent Laser-Induced Magnetization in Metals. In: Physical Review Letters. 2016, 117(13), 137203. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.117.137203
BibTex
@article{Berritta2016-09-23AbIni-46245,
  year={2016},
  doi={10.1103/PhysRevLett.117.137203},
  title={Ab Initio Theory of Coherent Laser-Induced Magnetization in Metals},
  number={13},
  volume={117},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Berritta, Marco and Mondal, Ritwik and Carva, Karel and Oppeneer, Peter M.},
  note={Article Number: 137203}
}
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    <dcterms:abstract xml:lang="eng">We present the first materials specific ab initio theory of the magnetization induced by circularly polarized laser light in metals. Our calculations are based on nonlinear density matrix theory and include the effect of absorption. We show that the induced magnetization, commonly referred to as inverse Faraday effect, is strongly materials and frequency dependent, and demonstrate the existence of both spin and orbital induced magnetizations which exhibit a surprisingly different behavior. We show that for nonmagnetic metals (such as Cu, Au, Pd, Pt) and antiferromagnetic metals the induced magnetization is antisymmetric in the light's helicity, whereas for ferromagnetic metals (Fe, Co, Ni, FePt) the imparted magnetization is only asymmetric in the helicity. We compute effective optomagnetic fields that correspond to the induced magnetizations and provide guidelines for achieving all-optical helicity-dependent switching.</dcterms:abstract>
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