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arXiv · 1805.02021

Selection Rules for All-Optical Magnetic Recording in Iron Garnet

A. Stupakiewicz·K. Szerenos·M. D. Davydova·K. A. Zvezdin·A. K. Zvezdin·A. Kirilyuk·A. V. Kimel
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Abstract

Finding an electronic transition a subtle excitation of which can launch dramatic changes of electric, optical or magnetic properties of media is one of the long-standing dreams in the field of photo-induced phase transitions [1-5]. Therefore the discovery of the magnetization switching only by a femtosecond laser pulse [6-10] triggered intense discussions about mechanisms responsible for these laser-induced changes. Here we report the experimentally revealed selection rules on polarization and wavelengths of ultrafast photo-magnetic recording in Co-doped garnet film and identify the workspace of the parameters (magnetic damping, wavelength and polarization of light) allowing this effect. The all-optical magnetic switching under both single pulse and multiple-pulse sequences can be achieved at room temperature, in narrow spectral ranges with light polarized either along <110> or <100> crystallographic axes of the garnet. The revealed selection rules indicate that the excitations responsible for the coupling of light to spins are d-electron transitions in octahedral and tetrahedral Co-sublattices, respectively.

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A. Stupakiewicz, K. Szerenos, M. D. Davydova, K. A. Zvezdin, A. K. Zvezdin, A. Kirilyuk, A. V. Kimel. 2018-05-05. Selection Rules for All-Optical Magnetic Recording in Iron Garnet. https://doi.org/10.1038/s41467-019-08458-w

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