Scattering of exchange spin waves from a helimagnetic layer sandwiched between two semi-infinite ferromagnetic media

Chirality of exchange spin waves exposed: Scattering and emission from interfaces between antiferromagnetically coupled ferromagnets

“…Substituting Eq. ( 17) into systems (12) for each of the interfaces, we obtain )) + 𝑖𝑘 A,p 𝐴 A 𝐶 A2,− = 0 .…”

“…those with a parabolic dispersion relation dominated by the symmetric exchange interaction, is reciprocal. Upon a closer examination, one finds that the magnetic chirality is related to the existence of exponentially varying (decaying or growing) solutions of the exchange spin-wave dispersion relationevanescent modes [9][10][11][12][13]. Notably, the handedness of precession of evanescent spin-wave modes is opposite to that of propagating modes [12], so that the propagating and evanescent modes at the same frequency complement each other.…”

“…Upon a closer examination, one finds that the magnetic chirality is related to the existence of exponentially varying (decaying or growing) solutions of the exchange spin-wave dispersion relationevanescent modes [9][10][11][12][13]. Notably, the handedness of precession of evanescent spin-wave modes is opposite to that of propagating modes [12], so that the propagating and evanescent modes at the same frequency complement each other. However, the exponential variation of evanescent modes in space makes them unphysical in unlimited magnonic media.…”

“…However, the exponential variation of evanescent modes in space makes them unphysical in unlimited magnonic media. In media with nonuniformities, such as interfaces [11][12][13] or magnetic domain walls [10], evanescent modes are physical but usually are either completely decoupled from or have only secondary effect on propagating modes.…”

Chiral magnonic resonators: Rediscovering the basic magnetic chirality in magnonics

“…transmission and reflection coefficients) of spin waves. 24 Fig. 1 Panel (a) shows Larmor precession of the magnetisation vector 𝑴 around its equilibrium value 𝑴 0 .…”