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Modulation of Standing Spin Waves in Confined Rectangular Elements
Milad Jalali1, Qian Chen1, Xuejian Tang1
1Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China.
Materials (Basel, Switzerland)
|May 25, 2024
Summary
This study explores controlling spin waves in magnetic nanostructures by altering material properties and shape. Changes in saturation magnetization and aspect ratio significantly impact spin wave frequencies and modes.
Area of Science:
- Spintronics
- Magnonics
- Condensed Matter Physics
Background:
- Magnonics is an emerging field in spintronics focused on spin wave manipulation in nanostructures.
- Spin waves are crucial for developing novel magnetic information processing devices.
Purpose of the Study:
- To investigate the modulation of standing spin waves in confined magnetic rectangular elements.
- To analyze the effects of saturation magnetization (MS), exchange constant (A), and aspect ratio on spin wave dynamics.
Main Methods:
- Micromagnetic simulations were employed to model spin wave behavior.
- Ferromagnetic resonance (FMR) experiments were conducted to validate simulation findings.
Main Results:
- A hybrid coupling was observed between bulk and edge modes.
- Decreasing MS shifted Kittel and spin wave modes to higher frequencies.
- Decreasing A reduced spin wave frequencies while minimally affecting the Kittel mode.
- Increasing the aspect ratio led to splitting of spin waves and the emergence of additional modes.
Conclusions:
- The study demonstrates effective control over spin wave modes through geometric and material property modifications.
- Simulation results were experimentally validated, confirming the predicted spin dynamic behaviors.
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