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Roles of heating and helicity in ultrafast all-optical magnetization switching in TbFeCo

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JournalApplied Physics Letters
DateAccepted/In press - 5 Jul 2018
DateE-pub ahead of print (current) - 18 Jul 2018
Volume113
Number of pages5
Pages (from-to)032405-1 to 032405-5
Early online date18/07/18
Original languageEnglish

Abstract

Using the time-resolved magneto-optical Kerr effect method, helicity-dependent all-optical magnetization switching (HD-AOS) is observed in ferrimagnetic TbFeCo films. Our results reveal the individual roles of the thermal and nonthermal effects after a single circularly polarized laser pulse. The evolution of this ultrafast switching occurs over different time scales, and a defined magnetization reversal time of 460 fs is shown—the fastest ever observed. Micromagnetic simulations based on a single macro-spin model, taking into account both heating and the inverse Faraday effect, are performed which reproduce HD-AOS demonstrating a linear path for magnetization reversal.

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    Research areas

  • all-optical, TbFeCo, magnetisation switching

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