Fig. 5: AFM Magnon excitation. | npj Computational Materials

Fig. 5: AFM Magnon excitation.

From: Excitation and detection of coherent sub-terahertz magnons in ferromagnetic and antiferromagnetic heterostructures

Fig. 5

a Temporal profiles of the Δ\(m_z^{(s)}\)(z = d, t)(s = 1, 2) in both magnetic sublattices of the FeMn at its top surface within t = 0–0.8 ns. Note that Δ\(m_z^{(s)}\)(z, t) = \(m_z^{(s)}\)(z, t)- \(m_z^{(s)}\)(z, t = 0), and t = 0 is defined as the moment the acoustic pulse enters the FeMn film from its bottom surface (z = 0). b Frequency spectrum of the Δ\(m_z^{(s)}\)(z = d, t) within t = 0–0.8 ns (red line) and the thickness-averaged acoustic pulse < εzz > (t) (black line). c Spatial profiles of the n = 2, 1 and 0 mode AFM magnon components, represented by the normalized Δ\(m_z^{(s)}\)(z, t) (red line for s = 1 and blue line for s = 2) across the 15-nm-thick FeMn.

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