All-optical manipulation and probing of the d-f exchange interaction in EuTe

Autor(es)

Subkhangulov, R. R. ^[1] ; Henriques, A. B. ^[2] ; Rappl, P. H. O. ^[3] ; Abramof, E. ^[3] ; Rasing, Th. ^[1] ; Kimel, A. V. ^[1]

Afiliação do(s) autor(es)

^[1] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen - Netherlands

^[2] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

^[3] LAS INPE, BR-12227010 Sao Jose Dos Campos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 4, MAR 24 2014.
• Citações Web of Science: 17

Resumo

We demonstrate that the ultrafast fast dynamics of the d-f exchange interaction, between conduction band electrons and lattice spins in EuTe, can be accessed using an all-optical technique. Our results reveal, in full detail, the time evolution of the d-f exchange interaction induced by a femtosecond laser pulse. Specifically, by monitoring the time resolved dynamics of the reflectivity changes and Kerr rotation of a weak light pulse reflected from the surface of the sample, it is shown that an intense femtosecond light pulse with photon energies higher than that of the bandgap, triggers spin waves in EuTe. The laser-induced spin waves modulate the d-f exchange interaction, and cause the bandgap to oscillate with an amplitude reaching 1 meV, at frequencies up to tens of GHz. The ability to control and monitor the dynamics of the exchange energy with our all-optical technique opens up new opportunities for the manipulation of magnetism at ultrafast time-scales. (AU)

• Processo FAPESP: 12/23406-0 - Investigação óptica de sistemas spintrônicos
• Beneficiário: Andre Bohomoletz Henriques
• Modalidade de apoio: Auxílio à Pesquisa - Regular