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Design and construction of a spin-wave lens
Jan-Niklas Toedt1, Mark Mundkowski1, Detlef Heitmann1
1Institute of Nanostructure and Solid State Physics, University of Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany.
Scientific Reports
|September 22, 2016
Summary
We focused Damon-Eshbach spin waves using a specially shaped nickel-iron film. This research introduces a novel algorithm for designing spin-wave lenses and experimentally validates a plano-convex lens geometry.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Spin waves are fundamental excitations in magnetic materials.
- Controlling spin wave propagation is crucial for developing magnonic devices.
- Damon-Eshbach waves are a specific type of spin wave relevant for thin films.
Purpose of the Study:
- To demonstrate the focusing of Damon-Eshbach waves using a geometrically shaped magnetic film.
- To develop and apply an algorithm for designing spin-wave lenses.
- To experimentally investigate the spin wave pattern generated by a fabricated lens.
Main Methods:
- Fabrication of a Ni80Fe20 film with a discrete thickness transition.
- Development of an algorithm to calculate the optimal shape of a spin-wave lens.
- Experimental realization of a plano-convex lens geometry.
- Time-resolved scanning Kerr microscopy for spin wave pattern analysis.
Main Results:
- Successful focusing of Damon-Eshbach waves was achieved.
- An algorithm for designing spin-wave lenses was successfully devised.
- Experimental validation of a plano-convex lens geometry demonstrated its effectiveness.
- The emitted spin-wave pattern was characterized using advanced microscopy techniques.
Conclusions:
- Shaped film thickness transitions can effectively focus Damon-Eshbach spin waves.
- The developed algorithm provides a pathway for designing efficient spin-wave lenses.
- Experimental results confirm the feasibility of using plano-convex geometries for spin wave manipulation.
