Figure 6: Py thin film and nanowire spin wave dispersion.
From: Nanowire spin torque oscillator driven by spin orbit torques
(a) Spin wave dispersion relation for BVSW (red) and SSW (blue) modes of a 5-nm thick Py film at H=890 Oe (ref. 51). Arrows indicate energy- and momentum-conserving four-magnon scattering of two uniform mode magnons into two BVSW magnons with wave vectors k4 and −k4. (b) Spin wave dispersion relation of the 190 nm wide nanowire numerically calculated for β=85° and H=890 Oe. The red squares and blue circles indicate the bulk and edge modes, respectively. Lines are guides to the eye. Energy- and momentum-conserving four-magnon scattering is not allowed within both the bulk and the edge mode branches of the nanowire spin wave dispersion.
