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Published on: June 28, 2018
Highly Efficient Spin-Orbit Torque Switching Using Bulk-Insulating Topological Insulator Bi2Se3.
Mehmet A Noyan1, Xiaohang Zhang1,2, Jisoo Moon1
1Magnetoelectronic Materials & Devices, Materials Science & Technology Division, Naval Research Laboratory, Washington, D. C. 20375, United States.
Achieving low-power spintronic devices requires efficient spin-orbit torque (SOT) switching. Researchers developed bulk-insulating topological insulators (TIs) that significantly enhance SOT efficiency and reduce switching current density.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Materials Science
Background:
- Topological insulators (TIs) offer potential for efficient spin-orbit torque (SOT) switching due to their surface states.
- Bulk-conducting channels in TIs hinder low-power spintronic device operation.
- Optimizing TI properties is crucial for advancing SOT applications.
Purpose of the Study:
- To synthesize and evaluate bulk-insulating topological insulators for enhanced SOT switching.
- To investigate the impact of Fermi level tuning on SOT efficiency.
- To demonstrate the benefits of in situ growth for creating clean interfaces and improving SOT performance.
Main Methods:
- Molecular beam epitaxy (MBE) for synthesizing bulk-insulating Bi2Se3 on buffer layers.
- Kerr rotation measurements to assess magnetic switching.
- Second harmonic Hall measurements to quantify SOT efficiency.
Main Results:
- A 4-fold reduction in critical current density for switching adjacent NiFe layers was observed with bulk-insulating Bi2Se3.
- A 5-10 fold enhancement in SOT efficiency was achieved.
- Fermi level tuning and clean interfaces in in situ grown heterostructures significantly boost SOT performance.
Conclusions:
- Bulk-insulating topological insulators are superior for low-power SOT switching compared to bulk-conducting ones.
- Controlling the Fermi level and interface quality are key strategies for maximizing SOT efficiency.
- This work paves the way for more efficient spintronic devices.
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