Spinwave propagation and coupling in magnonic waveguides

Abstract

Critical behavior of two-dimensional spin systems under the random-bond six-state clock model J. Appl. Phys. 112, 063924 (2012) Effect of spin drift on spin accumulation voltages in highly doped silicon Appl. Phys. Lett. 101, 122413 (2012) Spin-wave excitations induced by spin current through a magnetic point contact with a confined domain wall Appl. Phys. Lett. 101, 092405 (2012) Spin-torque effect on spin wave modes in magnetic nanowires Appl. Phys. Lett. 101, 072409 (2012) The influence of in-plane ferroelectric crystal orientation on electrical modulation of magnetic properties in Co60Fe20B20/SiO2/(011) xPb(Mg1/3Nb2/3)O3-(1−x)PbTiO3 heterostructuresIn this study, we start with the Landau-Lifshitz-Gilbert equation to describe the spinwaves in magnetic medium using the linearization approach. First, the reflection and refraction behaviors of spinwaves on an interface of a nonuniform magnetic medium is investigated. The study is then extended to spinwave propagation in lossless planar magnonic waveguides. Spinwave modes have been characterized based on the magnetic properties of the waveguides. Coupling between spinwaves in the structure of double magnonic waveguides is found to be possible due to the dipole interaction of the spinwaves. The spinwave coupling and power transfer associated with it is totally dependent on the waveguide structure and properties and the spinwave modes.

Magnetic Snell's law and spin-wave fiber with Dzyaloshinskii-Moriya interaction

“…The Snell's law in Eq. (3) is derived for an interface (domain wall) formed by two opposite magnetic domains in a single magnetic material, thus it is completely different from the Snell's laws that were derived for an interface between two regions with different magnetic properties [24,25]. In addition, Eq.…”

Snell's law of the magnetostatic surface wave in ferromagnetic films

“…We observed that wavenumber of the spin wave passing through the junction doubles reflecting the thickness difference. According to Snell's law, the relative refraction factor is defined as the phase velocity [6]. Because the dispersion of the MSSW depends on product of the wavenumber and the thickness, the relative refraction factor of the spin wave is proportional to inverse the thickness.…”

Comparison of spin-wave transmission in parallel and antiparallel magnetic configurations

“…which is the law of refraction for spin waves, or called the magnonic Snell's law [28][29][30][31][32][33][34] . Figure 3(b) is the θ t -ω/2π curve at θ i = 20 • .…”

“…It's worth noting that spin waves are thermally excited by the spin Seebeck effect (SSE) in the experiments of magnon valves 20 and magnon junctions 21 , thus the coherence of spin waves is ignored. In fact, the coherence is important for spin-wave transmission because it can lead to plentiful physical phenomena, such as refraction [28][29][30][31][32][33][34] , skin effect 35 , Goos-Hänchen (GH) shift [36][37][38][39] , tunneling 40 , resonant tunneling 41,42 and resonant transmission [43][44][45][46] . Therefore, the systematic researches on the transmission of coherent spin waves in P and AP magnetic configurations are necessary, however few studies have reported on this issue.…”