Fig. 4: Bias field dependence of spin wave modes in the presence of SAWs along the major axis and its characterization.
From: Formation of binary magnon polaron in a two-dimensional artificial magneto-elastic crystal
a Bias field (Hext) dependence of the experimental and simulated frequencies of the E1, E2, E3, A1, M1′ and M1′′ modes at the SAW frequency fSAW = 12 GHz, where the field is directed along the major axes of the nanomagnets. The SAW propagates along the major axis of the nanomagnets. The filled circular symbols denote the experimental results, and the gray line denotes the simulation results. The yellow box encloses the region where the A1, M1′ and M1′′ modes converge. b Zoomed view of the region within the yellow box. The filled circular symbols represent the experimental data, and the gray bands represent the results of the numerical simulation. c Power spectrum of the modes at the magnetic field of 1200 Oe where the strongest coupling occurs. Note that the A1 mode has disappeared since its power has been transferred to the M1′ and M1′′ modes and thus, it has an E2 mode. d Simulated power and phase profiles of the M1′ and M1′′ modes in four neighboring nanomagnets probed by the probe beam at Hext = 1050 Oe, 1200 Oe and 1350 Oe. The major axes of the elliptical nanomagnets are along the vertical direction, and the minor axes are along the horizontal direction. The profiles are identical in all four nanomagnets; hence, the phase map in the lower right corner and the power map in the other three plots are shown.
