Fig. 2: Magnon signals in time domain.
From: Resonant thermal energy transfer to magnons in a ferromagnetic nanolayer
Transient Kerr rotation signals measured in the vicinity of the first (left panel) and second (central panel) resonances and at the intermediate magnetic field of 190 mT, corresponding to off-resonance (right panel). The amplification of the precession amplitude observed at B = B1 = 44 mT and B = B2 = 250 mT is due to thermally induced resonant driving of the precession M by the oscillating effective field Beff. The torque Q acting on the magnetization (see sketch at the top right) is maximal at the resonance conditions: f = nf0.
