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A scenario for magnonic spin-wave traps
Frederik Busse1, Maria Mansurova1, Benjamin Lenk1
1I. Physikalisches Institut, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
Scientific Reports
|August 18, 2015
Summary
Laser pulses create temperature changes affecting spin-wave frequencies in CoFeB films. This thermal effect, observed up to one nanosecond, influences magnetization dynamics and magnonic crystals.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Magnetization dynamics in thin films are crucial for spintronic devices.
- Laser-induced effects offer precise control over magnetic properties.
- Spin-wave propagation is sensitive to local material parameters.
Purpose of the Study:
- To investigate the impact of laser-induced thermal profiles on spin-wave frequencies in CoFeB films.
- To quantify the frequency shift and temporal persistence of thermal effects.
- To explore these phenomena in a magnonic crystal structure.
Main Methods:
- Spatially resolved measurements of magnetization dynamics.
- Femtosecond laser pump-pulse excitation.
- Analysis of spin-wave modes in CoFeB thin films and antidot lattices.
Main Results:
- Spin-wave mode frequencies strongly depend on the distance from the laser pump center.
- A 0.5 GHz frequency shift was observed due to the laser-generated thermal profile.
- The thermal effect persisted for up to one nanosecond.
Conclusions:
- Laser-induced temperature gradients significantly alter spin-wave frequencies in CoFeB.
- This spatial thermal profile influences magnetization dynamics.
- The findings are relevant for understanding and controlling magnonic crystals.
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