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Colossal anisotropic absorption of spin currents induced by chirality
Rui Sun1,2, Ziqi Wang2,3, Brian P Bloom4
1Department of physics, North Carolina State University, Raleigh, NC 27695, USA.
Science Advances
|May 3, 2024
Summary
Chiral induced spin selectivity (CISS) in metal oxides enables spin current control without ferromagnets. This research reveals colossal anisotropic Gilbert damping, paving the way for advanced spintronic devices.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Chiral induced spin selectivity (CISS) effect offers a route to control electron spin orientation based on material structure.
- CISS effect allows chiral materials to act as spin analyzers, eliminating the need for ferromagnetic components in spintronic devices.
Purpose of the Study:
- To investigate anomalous spin current absorption in chiral metal oxides.
- To explore the potential of chiral materials in next-generation spintronic devices.
Main Methods:
- Experimental investigation of spin current absorption in chiral metal oxides.
- Analysis of anisotropic nonlocal Gilbert damping and its relation to chirality.
Main Results:
- Observed colossal anisotropic nonlocal Gilbert damping with a maximum-to-minimum ratio up to 1000% in chiral metal oxides.
- Demonstrated twofold symmetry in damping, attributed to chirality-induced spin splitting and differential spin dynamics.
- Confirmed that spin preference in chiral structures persists upon pure spin current injection.
Conclusions:
- Chiral metal oxides exhibit unique spin current absorption properties.
- The interplay between chirality and spin dynamics is crucial for directing spin current transport.
- Chiral materials present a promising design principle for advanced spintronic applications.
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