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Switching magnon chirality in artificial ferrimagnet
Yahui Liu1, Zhengmeng Xu1, Lin Liu1
1International Center for Quantum Materials, School of Physics, Peking University, 100871, Beijing, China.
Nature Communications
|March 11, 2022
Summary
Chirality in magnons offers new possibilities for spintronics. Researchers demonstrated controlling magnon chirality in a novel multilayer, enabling chiral spin currents for future computing devices.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Materials Science
Background:
- Chirality, a fundamental property, is underexplored for information technologies.
- Magnons in antiferromagnets can carry chiral information, suggesting potential for chirality-based spintronics.
- A practical platform for manipulating magnon chirality was previously lacking.
Purpose of the Study:
- To demonstrate the switching, reading, and modulation of magnon chirality.
- To establish a practical platform for chirality-based spintronics.
- To investigate the relationship between magnon chirality and spin current generation.
Main Methods:
- Fabrication of an artificial ferrimagnetic Py/Gd/Py/Gd/Py/Pt multilayer.
- Utilizing coexisting ferromagnetic and antiferromagnetic resonance modes for chirality control.
- Experimental demonstration of chiral spin current pumping.
Main Results:
- Successful switching, reading, and modulation of magnon chirality were achieved.
- The multilayer platform allows for high adjustability and control of magnon chirality.
- Oppositely chiral precessions in Py layers were shown to generate spin currents with opposite spin polarizations in the Pt layer.
Conclusions:
- Chirality can be effectively utilized as an independent degree of freedom in spintronic devices.
- The developed magnonic platform provides a feasible route for exploiting chirality in spintronics.
- This work paves the way for novel chirality-based computing architectures and chiral magnonic devices.
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