Fig. 4: Demonstration of toggle AOS with linearly polarized pulses for a CrI3(10 nm)/WSe2(1L) heterostructures (samples 2 and 3).
From: All-optical control of spin in a 2D van der Waals magnet
a The remanent M↓ and M↑ mono-domain states for sample 2, and the M↑ remanent state after exposure to N bunches of 103 pulses. b Differential Kerr signal \({D}_{{{{\rm{i}}}},{{{\rm{j}}}}}=\left|({M}_{{{{\rm{i}}}}}-{M}_{{{{\rm{j}}}}})\right|/(\left|{M}_{{{{\rm{i}}}}}\right |+\left|{M}_{{{{\rm{j}}}}}\right|)\) images extracted from the images in a. Differential images for sample 3 pumped with (c) N bunches of 106 pulses and d single pulses. e, f Kerr signal and differential Kerr signal Di,j (switching efficiency) integrated over the areas P1 (sample 2) and P2 (sample 3). The measurements were performed at 35 K, with pump photon energy 1.67 eV, ~30 fs pulse duration and fluences (a, b) F = 6.9 mJ/cm2, (c) F = 6.4 mJ/cm2, and d F = 7.1 mJ/cm2. The scale bars have 5 μm in length.
