Controlling the propagation of dipole-exchange spin waves using local inhomogeneity of the anisotropy
arXiv:2005.09965 · doi:10.1103/PhysRevB.102.014445
Abstract
Spin waves are promising candidates to carry, transport, and process information. Controlling the propagation characteristics of spin waves in magnetic materials is an essential ingredient for designing spin-wave based computing architectures. Here, we study the influence of surface inhomogeneities on the spin-wave signals transmitted through thin films. We use micromagnetic simulations to study the spin-wave dynamics in an in-plane magnetized yttrium iron garnet thin film with a thickness in the nanometre range in the presence of surface defects in the form of locally introduced uniaxial anisotropies. These defects are used to demonstrate that the Backward Volume Magnetostatic Spin Waves (BVMSW) are more responsive to backscattering in comparison to Magnetostatic Surface Spin Waves (MSSWs). For this particular defect type, the reason for this behavior can be quantitatively related to the difference in the magnon band structures for the two types of spin waves. To demonstrate this, we develop a quasi-analytical theory for the scattering process. It shows an excellent agreement with the micromagnetic simulations, sheds light on the backscattering processes and provides a new way to analyze the spin-wave transmission rates in the presence of surface inhomogeneities in sufficiently thin films, for which the role of exchange energy in the spin-wave dynamics is significant. Our study paves the way to designing magnonic logic devices for data processing which rely on a designed control of the spin-wave transmission.
arXiv comment6 Figures, 21 pages
References in corpus (19)
- The design and verification of Mumax3
- Emission and Propagation of Multi-Dimensional Spin Waves with nanoscale wavelengths in Anisotropic Spin Textures
- Spin-wave propagation in a microstructured magnonic crystal
- Current-controlled dynamic magnonic crystal
- Excitation of unidirectional exchange spin waves by a nanoscale magnetic grating
- Frequency non-reciprocity of surface spin wave in Permalloy thin films
- Low damping and microstructural perfection of sub-40nm-thin yttrium iron garnet films grown by liquid phase epitaxy
- Resources of nonlinear cavity magnonics for quantum information
- Reservoir computing using a spin-wave delay line active ring resonator
- A micro-structured ion-implanted magnonic crystal
- Spin transport in a magnetic insulator with zero effective damping
- Resonant scattering of spin waves from a region of inhomogeneous magnetic field in a ferromagnetic film
- Backscattering immunity of dipole-exchange magnetostatic surface spin waves
- Spin-wave phase inverter upon a single nanodefect
- Magnonic band gaps in waveguides with a periodic variation of the saturation magnetization
- Spin-Wave Modes in Transition from a Thin Film to a Full Magnonic Crystal
- Surface dynamics of rough magnetic films
- Non-reciprocal Oersted field contribution to the current-induced frequency shift of magnetostatic surface waves
- Controlling acoustic waves using magnetoelastic Fano resonances