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Direct and Inverse Spin Splitting Effects in Altermagnetic RuO2
Yaqin Guo1, Jing Zhang1, Zengtai Zhu1
1Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 16, 2024
Summary
Altermagnetic materials offer flexible spin control. This study reports direct and inverse altermagnetic spin splitting effects in RuO2 films, demonstrating anisotropic behavior dependent on current direction and temperature.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Altermagnetic materials exhibit spin splitting effects (SSE) controllable by the Néel vector.
- Flexible control of spin polarization is a key goal in spintronics.
Purpose of the Study:
- To investigate direct and inverse altermagnetic spin splitting effects (ASSE) in (101)-oriented RuO2 films.
- To explore the influence of Néel vector orientation and temperature on ASSE.
Main Methods:
- Spin torque-induced ferromagnetic resonance (ST-FMR) to detect spin torque.
- Current-induced modulation of damping to quantify damping-like torque efficiency (ξDL).
- Spin pumping measurements to study inverse ASSE.
Main Results:
- Anisotropic spin splitting observed in RuO2, with z-spin torque emerging for current along the [010] direction.
- Anisotropic damping-like torque efficiency (ξDL) maximized for current along [010] and temperature-dependent.
- Inverse altermagnetic spin splitting effect (IASSE) also showed anisotropic and temperature-dependent behavior.
Conclusions:
- Comprehensive study of direct and inverse ASSE in altermagnetic RuO2.
- Demonstrated flexible control of spin polarization via crystal orientation and temperature.
- Inspires future altermagnetic materials and devices for spintronic applications.
Keywords:
altermagnetic materialsinverse spin splitting effectspin pumpingspin splitting effectspin–torque ferromagnetic resonanceMore Related Videos
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