Fig. 1
From: Strongly coupled magnon–phonon dynamics in a single nanomagnet
Experimental illustrations and colormaps. a Scanning electron microscope image of 330 x 330 x 30 nm Ni nanomagnet. b When the pump pulse (400 nm) irradiates the sample, the deposited heat causes the element to thermally expand, which causes the element to vibrate at eigenfrequencies determined by the geometry and material properties. In addition, the heat perturbs the magnetization causing the spins to precess around the effective field. Due to magnetostriction, the spin and phonon systems are coupled to one another. A probe pulse (800 nm) which is delayed in time monitors the dynamics following excitation. c Fourier amplitude spectra normalized for each field bin of the magnetic and (d) the non-magnetic detection channels. The arrows and dotted lines are indicators of the phononic eigenfrequencies. The positions of these frequencies match in the magnetic and non-magnetic spectra. e Experimental geometry. The x and y axes are defined to be the in-plane directions along the edges of the nanomagnet and the z-axis in the direction of the surface normal. The external field H is applied at θH=60° with respect to the surface normal. This cants the magnetization vector MS out of the plane to an angle θM with respect to the surface normal and to an in-plane angle, φM from the x-axis. The phononic modes k are characterized by their mode indices and their in-plane angle, φk. φmp is the in-plane angle between MS and k
