Fig. 2: Symmetries of the THz-emission signal in NiO(001)(10 nm)/Pt(2 nm) bilayer. | Nature Communications

Fig. 2: Symmetries of the THz-emission signal in NiO(001)(10 nm)/Pt(2 nm) bilayer.

From: Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions

Fig. 2: Symmetries of the THz-emission signal in NiO(001)(10 nm)/Pt(2 nm) bilayer.The alternative text for this image may have been generated using AI.

a Dependence of the THz signal on the in-plane angle \(\theta\), describing a rotation of the sample around the surface normal. THz emission shows a uniaxial behavior consistent with the presence of large T-domains (hundreds of microns in size) contribution. b THz emission for \(\theta \,\)= \({\theta }_{0}\simeq 35^\circ\) and \(\theta\) = \({\theta }_{0}\,\)+ 180° shows a sign reversal (\(\pm\) label in panel a). The inset shows the magneto-optical birefringence imaging of an as grown NiO/Pt bilayer, presenting a majority of one T-domain orientation (gray contrast) with a small contribution of orthogonal minority T-domain (white contrast circled in red). The black spots are defects on the sample surface. c Dependence of the THz signal on the linear pump polarization (angle \(\alpha\)) showing an isotropic behavior in line with a thermal generation of magnons from light absorption in the Pt. Error bars correspond to standard deviations.

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