Ultrafast light-induced magnetization in non-magnetic films: from orbital and spin Hall phenomena to the inverse Faraday effect

The field of orbitronics has emerged with great potential to impact information technology by enabling environmentally friendly electronic devices. The main electronic degree of freedom at play is the orbital angular momentum, which can give rise to a myriad of phenomena such as the orbital Hall eff...

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Bibliographic Details
Published in:Frontiers in physics 2024-05, Vol.12
Main Authors: Hamamera, Hanan, Souza Mendes Guimarães, Filipe, dos Santos Dias, Manuel, Lounis, Samir
Format: Article
Language:English
Subjects:
inverse Faraday effect
light-matter interaction
orbitronics
spin and orbital Hall effects
spin and orbital magnetisation
ultrafast dynamics
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Summary:The field of orbitronics has emerged with great potential to impact information technology by enabling environmentally friendly electronic devices. The main electronic degree of freedom at play is the orbital angular momentum, which can give rise to a myriad of phenomena such as the orbital Hall effect (OHE), torques and orbital magnetoelectric effects. Here, we explore via realistic time-dependent electronic structure simulations the magnetic response of a non-magnetic material, an ultrathin Pt film, to ultrafast laser pulses of different polarizatons and helicities. We demonstrate the generation of significant orbital and spin magnetizations and identify the underlying mechanisms consisting of the interplay of the OHE, inverse Faraday effect and spin-orbit interaction. Our discoveries advocate for the prospect of encoding magnetic information using light in materials that are not inherently magnetic.
ISSN:2296-424X
2296-424X
DOI:10.3389/fphy.2024.1354870