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Spin-wave-beam driven synchronization of nanocontact spin-torque oscillators
A Houshang1,2, E Iacocca1,2, P Dürrenfeld1
1Physics Department, University of Gothenburg, Gothenburg 412 96, Sweden.
Nature Nanotechnology
|December 23, 2015
Summary
The Oersted field influences nanocontact spin-torque oscillator (NC-STO) synchronization via spin waves (SWs). Vertical NC-STO alignment promotes synchronization, enabling up to five oscillators to synchronize, a new record.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Nonlinear Dynamics
Background:
- Spin waves (SWs) mediate synchronization in multiple nanocontact spin-torque oscillators (NC-STOs).
- The Oersted field's impact on SW emission patterns is known, but its role in NC-STO synchronization remains unexplored.
Purpose of the Study:
- To investigate the influence of the Oersted field on the synchronization behavior of multiple NC-STOs.
- To explore how NC-STO orientation (vertical vs. horizontal) affects synchronization dynamics.
Main Methods:
- Simulated synchronization in vertically and horizontally oriented NC-STO arrays.
- Analyzed the effect of Oersted field landscapes on spin wave propagation and synchronization.
Main Results:
- Oersted fields promote synchronization in vertically aligned NC-STOs due to anisotropic SW propagation.
- Robust synchronization observed for separations exceeding 1,000 nm.
- Achieved synchronization of up to five NC-STOs in a vertical array, a new record.
- Synchronization in vertical arrays was found to be non-mutual.
Conclusions:
- The Oersted field plays a critical role in mediating NC-STO synchronization, dependent on device orientation.
- Vertical NC-STO configurations enable enhanced synchronization over longer distances and with more oscillators.
- The non-mutual nature of synchronization in vertical arrays opens new avenues for device applications.
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