Spin wave surface states in one-dimensional planar magnonic crystals

Abstract

We have investigated surface spin wave states in one-dimensional planar bi-component magnonic crystals, localized on the surfaces resulting from the breaking of the periodic structure. The two systems have been considered: the magnonic crystal with periodic changes of the anisotropy field in exchange regime and the magnonic crystal composed of Fe and Ni stripes in dipolar regime with exchange interactions included. We chose the symmetric unit cell for both systems to implement the symmetry related criteria for existence of the surface states. We investigated also the surface states induced by the presence of perturbation of the surface areas of the magnonic crystals. We showed, that the system with modulated anisotropy is a direct analog of the electronic crystal. Therefore, the surface states in both systems have the same properties. For surface states existing in magnonic crystals in dipolar regime we demonstrated that spin waves preserve distinct differences to the electronic crystals, which are due to long-range dynamic dipolar interactions. We found that tuning of the strength of magnetization pinning resulting from the surface anisotropy or dipolar effect is vitally important for existence of the surface states in magnonic crystals.

References in corpus (3)

• Scattering of surface and volume spin waves in a magnonic crystal
• Theoretical formalism for collective spin-wave edge excitations in arrays of dipolarly interacting magnetic nanodots
• Spin wave damping in periodic and quasiperiodic magnonic structures

Cited by in corpus (8)

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• Spin-Wave Modes in Transition from a Thin Film to a Full Magnonic Crystal
• Non-uniform spin wave softening in 2D magnonic crystals as a tool for opening omnidirectional magnonic band gaps
• Influence of nonmagnetic dielectric spacers on the spin wave response of one-dimensional planar magnonic crystals
• Reversible tuning of omnidirectional band gaps in two-dimensional magnonic crystals by magnetic field and in-plane squeezing
• Magnetic Field Controlled Surface Localization of Spin-Wave Ferromagnetic Resonance Modes in 3D Nanostructures
• Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width