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Electric manipulation of spin relaxation using the spin Hall effect
1Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan. kazuya_ando@z8.keio.jp
Physical Review Letters
|September 4, 2008
Summary
Researchers electrically controlled magnetization relaxation in Ni81Fe19/Pt films using the spin Hall effect. This technique tunes magnetic dynamics without direct current in the magnetic layer, regardless of film size.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Magnetization relaxation is crucial for magnetic dynamics.
- Electrical control of magnetic properties is highly desirable for spintronic devices.
- The spin Hall effect offers a route to generate spin currents from charge currents.
Purpose of the Study:
- To demonstrate electrical manipulation of magnetization relaxation in Ni81Fe19/Pt films.
- To utilize the spin Hall effect for controlling magnetic dynamics.
- To explore a method for tuning magnetization dynamics independent of film size.
Main Methods:
- Applying electric current to the platinum (Pt) layer in a Ni81Fe19/Pt heterostructure.
- Leveraging the spin Hall effect to induce spin torque on the Ni81Fe19 magnetization.
- Measuring the modulation of magnetization relaxation.
Main Results:
- Electrical current in the Pt layer successfully manipulated magnetization relaxation in the Ni81Fe19 layer.
- Macroscopic spin transfer via the spin Hall effect was confirmed.
- Magnetization dynamics were tuned without direct electrical current to the magnetic layer.
Conclusions:
- The spin Hall effect provides an effective electrical method to control magnetization relaxation.
- This approach offers size-independent tuning of magnetization dynamics.
- Potential applications in advanced spintronic devices and magnetic memory.
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