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Figure 1

From: Prediction of Deterministic All-Optical Switching of Ferromagnetic Thin Film by Ultrafast Optothermal and Optomagnetic Couplings

Figure 1

All-Optical Switching (AOS) scheme and time evolution of magnetization. (a) Illustration of AOS. Laser pulses heat up the magnetic material, and the induced magnetic field arising from inverse Faraday effect (IFE), which can either flip or preserve the final magnetization depending on the helicity of laser pulses. (b) The time evolution of magnetization subjected to a single pulse of left-handed (σ−), linearly (L) and right-handed (σ+) polarized light. Black and white areas correspond to up (M+) and down (M−) magnetic domains. The laser fluence is 2.6 mJ/cm2 with 140 fs duration (full width at half maximum) and the beam diameter (defined by 1/e of peak intensity) is 10 μm. The magneto-optical susceptibility α is set to be 2.13 × 10−11 A∙m/V2 (corresponding to 1 T effective field produced by 1 mJ/cm2 laser fluence). The scale bar is 10 μm.

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