Fig. 3: HD-AOS within circular region P1 in the center of the heterostructure CrI3(10 nm)/WSe2(1L) (sample 2). | Nature Communications

Fig. 3: HD-AOS within circular region P1 in the center of the heterostructure CrI3(10 nm)/WSe2(1L) (sample 2).

From: All-optical control of spin in a 2D van der Waals magnet

Fig. 3

a HD-AOS induced by N bunches of 102 pulses with circular polarization alternating between σ+ and σ−. The plot shows the effect of the optical pumping for two different initial remanent states, M↑ (black squares) and M↓ (red circles). b HD-AOS for N bunches of 105 pulses alternating between σ− and σ+ circular polarization. The Kerr signal in a and b is extracted from the 2 μm wide circular spot P1 outlined with a white circle in the M↑ domain structure image shown in the inset. The measurements were performed at 35 K, with pump photon energy 1.67 eV, ~30 fs pulse duration and fluence F = 6.9 mJ/cm2. The scale bar has 5 μm in length.

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