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Spin-Current-Controlled Modulation of the Magnon Spin Conductance in a Three-Terminal Magnon Transistor.
L J Cornelissen1, J Liu1, B J van Wees1
1Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Physical Review Letters
|March 17, 2018
Summary
Researchers demonstrated a new method to control thermal magnon transport in yttrium iron garnet. This technique modulates magnon spin conductance, paving the way for advanced magnon spintronic devices and logic circuits.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Materials Science
Background:
- Efficient manipulation of magnon spin transport is key for advancing magnon-based spintronic devices.
- Yttrium iron garnet (YIG) is a promising material for such applications due to its favorable magnetic properties.
Purpose of the Study:
- To demonstrate a method for modulating the diffusive transport of thermal magnons in a YIG channel.
- To investigate the potential for developing thermal-magnon-based logic circuits.
Main Methods:
- Utilizing a spin Hall injection technique with a third modulator electrode to alter magnon chemical potential.
- Employing diffusive transport of thermal magnons in a YIG channel between injector and detector contacts.
- Conducting finite element modeling to predict performance improvements.
Main Results:
- Achieved a modulation efficiency of 1.6%/mA at 250 K.
- Demonstrated proof of principle for modulating magnon spin conductance.
- Finite element modeling suggests potential for >10%/mA efficiency with reduced channel thickness.
Conclusions:
- The developed method effectively modulates thermal magnon transport.
- This technique offers promising prospects for the realization of thermal-magnon-based logic circuits.
- Further optimization, such as reducing channel thickness, can significantly enhance modulation efficiency.
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