Ab Initio Theory of Coherent Laser-Induced Magnetization in Metals
2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, no 13Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2016. Vol. 117, no 13
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-305334DOI: 10.1103/PhysRevLett.117.137203ISI: 000383851000020OAI: oai:DiVA.org:uu-305334DiVA: diva2:1037338
FunderEU, FP7, Seventh Framework Programme, 281043Swedish Research CouncilKnut and Alice Wallenberg FoundationSwedish National Infrastructure for Computing (SNIC)