NDLI: Ultrafast optical modification of exchange interactions in iron oxides

Content Provider	PubMed Central
Author	Mikhaylovskiy, R. V. Hendry, E. Secchi, A. Mentink, J. H. Eckstein, M. Wu, A. Pisarev, R. V. Kruglyak, V. V. Katsnelson, M. I. Rasing, Th Kimel, A. V.
Copyright Year	2015
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 103 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.
Related Links	http://dx.doi.org/10.1038/ncomms9190
Starting Page	8190
File Format	PDF
ISSN	20411723
e-ISSN	20411723
Journal	Nature Communications
Volume Number	6
Language	English
Publisher	Nature Pub. Group
Publisher Date	2015-09-16
Access Restriction	Open
Rights Holder	Nature Pub. Group
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Chemistry Physics and Astronomy Biochemistry, Genetics and Molecular Biology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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