Figure 8
Cases of AOS at off-center locations at a laser fluence of 3.2 mJ/cm2, which can heat up the electrons to well above the Curie temperature at the center of the laser beam. (a) When IFE is strong enough (at magneto-optical susceptibility of 1 T per mJ/cm2), no AOS occurs for single pulse at a 2-µm laser beam size. For a single laser pulse of 20 µm size, the beam center is demagnetized while the edge of the laser beam becomes deterministically switched. (b) As the magneto-optical susceptibility reduces to 0.1 T per mJ/cm2, the edge-flip phenomena may still occur near beam edge but become weaker. And when it further reduced to the order of 0.01 T per mJ/cm2, no obvious AOS can be observed within the laser affected zone. (c) When the magneto-optical susceptibility is 0.03 T per mJ/cm2, the edge-flip phenomena can still occur when the material irradiated by multiple pulses. The side lengths for plot regions are all 15 µm.
