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Fully Field-Free Spin-Orbit Torque Switching Induced by Spin Splitting Effect in Altermagnetic RuO2
Zhuoyi Li1,2,3, Zhe Zhang1,2,3, Yuzhe Chen1,2,3
1National Key Laboratory of Spintronics, Nanjing University, Suzhou, 215163, China.
Researchers achieved 100% field-free spin-orbit torque switching using RuO2 and Co/Pt layers. This altermagnetic material enables robust switching without external magnetic fields, advancing spintronics.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Materials Science
Background:
- Altermagnetism combines ferromagnetism and antiferromagnetism properties.
- Spintronics offers advanced electronic functionalities.
- Field-free switching is crucial for energy-efficient devices.
Purpose of the Study:
- To demonstrate field-free spin-orbit torque (SOT) switching.
- To investigate the role of RuO2 in generating spin currents.
- To explore altermagnetic spin splitting effect (ASSE) for enhanced SOT.
Main Methods:
- Fabrication of RuO2(101)/[Co/Pt]2/Ta heterostructures.
- Experimental measurement of spin currents and SOT switching.
- Analysis of spin polarization and torque generation mechanisms.
Main Results:
- Achieved 100% field-free SOT switching in the heterostructure.
- Identified z-polarized spin currents along the [100] axis.
- Demonstrated maximized spin current generation with current along [010] due to ASSE in RuO2.
- Observed stable SOT switching resistant to external magnetic fields.
Conclusions:
- RuO2 is a potent spin current generator.
- Altermagnetic materials enable efficient field-free SOT switching.
- This work paves the way for advanced spintronic devices with enhanced performance.
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