Model for multishot all-thermal all-optical switching in ferromagnets

Abstract : All-optical magnetic switching (AOS) is a recently observed rich and puzzling phenomenon that offers promising technological applications. However, a fundamental understanding of the underlying mechanisms remains elusive. Here we present a model for multishot helicity-dependent AOS in ferromagnetic materials based on a purely heat-driven mechanism in the presence of magnetic circular dichroism (MCD). We predict that AOS should be possible with as little as 0.5% of MCD, after a minimum number of laser shots heat the sample close to the Curie temperature. Finally, we qualitatively reproduce the all-optically switched domain patterns observed experimentally by numerically simulating the result of multiple laser shots on an FePtC granular ferromagnetic film.
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J. Gorchon, Y. Yang, J. Bokor. Model for multishot all-thermal all-optical switching in ferromagnets. Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 94 (2), ⟨10.1103/PhysRevB.94.020409⟩. ⟨hal-02105805⟩

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