Figure 2: Nature Communications

Fig. 2

From: Direct imaging of delayed magneto-dynamic modes induced by surface acoustic waves

Fig. 2

Images of SAW. a PEEM image of multiple Ni squares of 2 × 2 μm2 with a field of view of 50 μm recorded at a photoelectron energy of 4.8 V. The piezoelectric voltage produces periodic dark and bright zones in the PEEM image with the periodicity of the SAW, λ SAW = 8μm. b Two photoelectron energy scans of the photoemission intensity corresponding to a bright and a dark zone (indicated in a with red and orange arrows). The vertical line indicates the electron energy at which a was acquired. c Schematic plot of the in-plane strain (in green colorscale) induced modulation in the LiNbO3 caused by the acoustic wave. Dashed blue line indicates the oscillating piezoelectric voltage modulation. d Calculation of the in-plane strain component (right hand side axis) and the piezoelectric voltage (left hand side axis) at the sample surface for a SAW with a λ SAW = 8 μm wavelength. Calculations of the strain are done to match the measured piezoelectric voltage of a. The magnetization changes are driven basically by the in-plane strain component along the SAW propagation direction. The piezoelectric voltage is in phase with the in-plane strain component, albeit with an opposite sign