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Anisotropic and Controllable Gilbert-Bloch Dissipation in Spin Valves
Akashdeep Kamra1, Dmytro M Polishchuk2, Vladislav Korenivski2
1Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway.
Researchers found a way to control magnetic damping in spin valves by changing the fixed layer magnetization angle. This tuning is crucial for spintronic devices like read heads and oscillators.
Area of Science:
- Spintronics
- Condensed Matter Physics
Background:
- Spin valves are fundamental components in spintronic devices.
- Magnetic damping in the free layer affects device performance.
Purpose of the Study:
- To investigate the dependence of magnetic damping on magnetization angle in spin valves.
- To explore methods for tuning magnetic damping in situ.
Main Methods:
- Theoretical analysis of spin pumping-mediated damping.
- Investigation of anisotropic and tensorial damping terms.
- Consideration of Gilbert- and Bloch-like damping.
Main Results:
- Magnetic damping is anisotropic and depends on the relative magnetization angle.
- A mechanism to tune free layer damping via fixed layer magnetization orientation was identified.
- Damping can be tuned from negligible to large values, especially with insulating magnets.
Conclusions:
- The orientation of fixed layer magnetization offers an in situ method to control free layer damping.
- The Bloch damping contribution from spin accumulation is significant.
- Understanding this tuning mechanism is vital for advancing spintronic device design.
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