Role of Magnetic Circular Dichroism in All-Optical Magnetic Recording

A. R. Khorsand, M. Savoini, A. Kirilyuk, A. V. Kimel, A. Tsukamoto, A. Itoh, Th. Rasing

doi:10.1103/physrevlett.108.127205

Role of Magnetic Circular Dichroism in All-Optical Magnetic Recording

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書誌事項

公開日: 2012-03-20

権利情報

http://creativecommons.org/licenses/by/3.0/

DOI

10.1103/physrevlett.108.127205

公開者: American Physical Society (APS)

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説明

Using magneto-optical microscopy in combination with ellipsometry measurements, we show that all-optical switching with polarized femtosecond laser pulses in ferrimagnetic GdFeCo is subjected to a threshold fluence absorbed in the magnetic layer, independent of either the excitation wavelength or the polarization of the laser pulse. Furthermore, we present a quantitative explanation of the intensity window in which all-optical helicity-dependent switching (AO-HDS) occurs, based on magnetic circular dichroism. This explanation is consistent with all the experimental findings on AO-HDS so far, varying from single- to multiple-shot experiments. The presented results give a solid understanding of the origin of AO-HDS, and give novel insights into the physics of ultrafast, laser controlled magnetism.