Ultrafast optical modification of exchange interactions in iron oxides

Mikhaylovskiy, R.V. and Hendry, E. and Secchi, A. and Mentink, J.H. and Eckstein, M. and Wu, A. and Pisarev, R.V. and Kruglyak, V.V. and Katsnelson, M.I. and Rasing, Th. and Kimel, A.V. (2015) Ultrafast optical modification of exchange interactions in iron oxides. Nature Communications, 6: 8190. ISSN 2041-1723

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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.

Item Type:
Journal Article
Journal or Publication Title:
Nature Communications
Uncontrolled Keywords:
?? general biochemistry,genetics and molecular biologygeneral chemistrygeneral physics and astronomybiochemistry, genetics and molecular biology(all)chemistry(all)physics and astronomy(all) ??
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Deposited On:
12 Mar 2019 16:30
Last Modified:
16 Jul 2024 10:59