TY  - JOUR
AU  - Mikhaylovskiy, R. V.
AU  - Hendry, E.
AU  - Secchi, A.
AU  - Mentink, J. H.
AU  - Eckstein, M.
AU  - Wu, A.
AU  - Pisarev, R. V.
AU  - Kruglyak, V. V.
AU  - Katsnelson, M. I.
AU  - Rasing, Th.
AU  - Kimel, A. V.
TI  - Ultrafast optical modification of exchange interactions in iron oxides
JO  - Nature Communications
VL  - 6
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - PUBDB-2016-02875
SP  - 8190 -
PY  - 2015
AB  - Ultrafast non-thermal manipulation of magnetization by light relies on either indirect coupling of the electric field component of the light with spins via spin-orbit interaction or direct coupling between the magnetic field component and spins. Here we propose a scenario for coupling between the electric field of light and spins via optical modification of the exchange interaction, one of the strongest quantum effects with strength of 10<sup>3</sup> Tesla. We demonstrate that this isotropic opto-magnetic effect, which can be called inverse magneto-refraction, is allowed in a material of any symmetry. Its existence is corroborated by the experimental observation of terahertz emission by spin resonances optically excited in a broad class of iron oxides with a canted spin configuration. From its strength we estimate that a sub-picosecond modification of the exchange interaction by laser pulses with fluence of about 1 mJ cm−2 acts as a pulsed effective magnetic field of 0.01 Tesla.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000363017100017
C6  - pmid:26373688
DO  - DOI:10.1038/ncomms9190
UR  - https://bib-pubdb1.desy.de/record/301806
ER  -