X-Ray Microscopy of Spin Wave Focusing using a Fresnel Zone Plate

Abstract

Magnonics, i.e. the artificial manipulation of spin waves, is a flourishing field of research with many potential uses in data processing within reach. Apart from the technological applications the possibility to directly influence and observe these types of waves is of great interest for fundamental research. Guidance and steering of spin waves has been previously shown and lateral spin wave confinement has been achieved. However, true spin wave focusing with both lateral confinement and increase in amplitude has not been shown before. Here, we show for the first time spin wave focusing by realizing a Fresnel zone plate type lens. Using x-ray microscopy we are able to directly image the propagation of spin waves into the nanometer sized focal spot. Furthermore, we observe that the focal spot can be freely moved in a large area by small variations of the bias field. Thus, this type of lens provides a steerable intense nanometer sized spin wave source. Potentially, this could be used to selectively illuminate magnonic devices like nano oscillators with a steerable spin wave beam.

References in corpus (13)

• The design and verification of Mumax3
• The building blocks of magnonics
• Magnonics: Experiment to Prove the Concept
• LaBonte's method revisited: An effective steepest descent method for micromagnetic energy minimization
• Effects of spatially engineered Dzyaloshinskii-Moriya interaction in ferromagnetic films
• Snell's Law for Spin Waves
• Nonlinear emission of spin-wave caustics from an edge mode of a micro-structured Co2Mn0.6Fe0.4Si waveguide
• Spin wave power flow and caustics in ultrathin ferromagnets with the Dzyaloshinskii-Moriya interaction
• Adiabatic Control of Spin-Wave Propagation using Magnetisation Gradients
• Spin Wave Diffraction and Perfect Imaging of a Grating
• A Luneburg lens for spin waves
• Spin wave beam propagation in ferromagnetic thin film with graded refractive index: mirage effect and prospective applications
• Tunable Snell's law for spin waves in heterochiral magnetic films

Cited by in corpus (7)

• Filtering and imaging of frequency-degenerate spin waves using nanopositioning of a single-spin sensor
• Spin-wave focusing induced skyrmion generation
• Spin wave diffraction model for perpendicularly magnetized films
• Spin-Wave Self-Imaging: Experimental and Numerical Demonstration of Caustic and Talbot-like Diffraction Patterns
• Magnetic skyrmion generation by reflective spin-wave focusing
• Electrically controlled focusing of de Broglie matter waves by Fresnel zone plate
• Spin-wave Goos-Hänchen effect induced by 360 degree domain walls in magnetic heterostructures