Control of Spin-Wave Propagation using Magnetisation Gradients

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Spin waves are fundamental excitations in magnetic materials.
• Controlling spin-wave propagation is crucial for developing advanced spintronic devices.
• Existing methods for spin-wave steering are often limited in flexibility and efficiency.

Purpose of the Study:

• To demonstrate a method for dynamically controlling the in-plane direction of spin waves.
• To investigate the use of laser-induced magnetic gradients for spin-wave manipulation.
• To explore the potential for creating reconfigurable magnonic circuits.

Main Methods:

• Utilizing a reconfigurable, laser-induced magnetization gradient in an in-plane magnetized magnetic film.
• Creating a conversion area where backward volume and surface spin-wave modes coexist at the same frequency.
• Employing experimental measurements and numerical calculations to validate the findings.

Main Results:

• Achieved up to 90 degrees of in-plane spin-wave direction change using the induced magnetic gradient.
• Demonstrated that the shape and orientation of the gradient effectively control the conversion efficiency.
• Observed excellent agreement between experimental data and numerical simulations.

Conclusions:

• The developed method allows for efficient and dynamic in-plane steering of spin waves.
• This technique paves the way for the realization of sophisticated magnonic circuits with tunable signal pathways.
• The findings offer a new paradigm for manipulating spin-wave propagation in magnetic systems.