Journal Article

PUBDB-2016-02875

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ultrafast optical modification of exchange interactions in iron oxides

Mikhaylovskiy, R. V. (Corresponding author) ; Hendry, E. ; Secchi, A. ; Mentink, J. H. ; Eckstein, M.Extern* ; Wu, A. ; Pisarev, R. V. ; Kruglyak, V. V. ; Katsnelson, M. I. ; Rasing, T.Extern* ; Kimel, A. V.

2015
Nature Publishing Group London

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Please use a persistent id in citations: doi:10.1038/ncomms9190

Abstract: 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$^3$ 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.

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Contributing Institute(s):

1. Forschungsgruppe für strukturelle Dynamik (MPSD)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)
2. MAGNONICS - Magnonics: Mastering Magnons in Magnetic Meta-Materials (228673) (228673)
3. GO FAST - Governing ultrafast the conductivity of correlated materials (280555) (280555)
4. FANTOMAS - Femtosecond opto-magnetism and novel approaches to ultrafast magnetismat the nanoscale (214810) (214810)
5. FEMTOMAGNETISM - Femtosecond Laser Control of Spins in Magnetic Materials: from fundamentals to nanoscale dynamics (257280) (257280)
6. EXCHANGE - Magnetism at the time and length scale of the Exchange interaction (339813) (339813)
7. GRASP - GRAPHENE-BASED SINGLE-PHOTON NONLINEAR OPTICAL DEVICES (613024) (613024)
8. FEMTOSPIN - Multiscale Modelling of Femtosecond Spin Dynamics (281043) (281043)

Experiment(s):

1. No specific instrument

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