Reconfigurable field-free spin Hall nano-oscillators enabled by crystallographic anisotropy in epitaxial Co/Pt
Abstract
Spin Hall nano-oscillators (SHNOs) are nanoscale microwave sources for wireless communication, neuromorphic computing and oscillator-based Ising machines, but conventional devices require a global magnetic bias. Here we replace this bias through crystallographic anisotropy in epitaxial Co/Pt. Growth of hcp Co with its c-axis in the film plane produces an anisotropy field of about 0.36 T and enables field-free auto-oscillations above 10 GHz in nanoconstriction SHNOs. The active current polarity is selected by the remanent magnetization, providing nonvolatile reconfiguration of the oscillation state. Micro-focused Brillouin light scattering confirms that the nonlinear response is confined to the nanoconstriction region. Lithographic control of the angle between the current and anisotropy axes tunes the excitation threshold and drives two spectral branches from separated modes to a dominant single branch, consistent with mutual synchronization. These results establish epitaxial crystallographic anisotropy as a route to reconfigurable field-free spintronic oscillators and oscillator networks.
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BibTeX
@misc{choi2026reconfigurable,
title = {{Reconfigurable field-free spin Hall nano-oscillators enabled by crystallographic anisotropy in epitaxial Co/Pt}},
author = {Jong-Guk Choi and Avinash Kumar Chaurasiya and Jaimin Kang and Venkatesh Vadde and Peter G. Lim and Roman Khymyn and Ahmad A. Awad and Akash Kumar and Mark C. Hersam and Vinayak P. Dravid and Pedram Khalili Amiri and Johan Åkerman},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.10131},
eprint = {2609.10131},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.10131},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Reconfigurable field-free spin Hall nano-oscillators enabled by crystallographic anisotropy in epitaxial Co/Pt
AU - Jong-Guk Choi
AU - Avinash Kumar Chaurasiya
AU - Jaimin Kang
AU - Venkatesh Vadde
AU - Peter G. Lim
AU - Roman Khymyn
AU - Ahmad A. Awad
AU - Akash Kumar
AU - Mark C. Hersam
AU - Vinayak P. Dravid
AU - Pedram Khalili Amiri
AU - Johan Åkerman
PY - 2026
DA - 2026/09/09
PB - arXiv
DO - 10.48550/arxiv.2609.10131
UR - https://arxiv.org/abs/2609.10131
AB - Spin Hall nano-oscillators (SHNOs) are nanoscale microwave sources for wireless communication, neuromorphic computing and oscillator-based Ising machines, but conventional devices require a global magnetic bias. Here we replace this bias through crystallographic anisotropy in epitaxial Co/Pt. Growth of hcp Co with its c-axis in the film plane produces an anisotropy field of about 0.36 T and enables field-free auto-oscillations above 10 GHz in nanoconstriction SHNOs. The active current polarity is selected by the remanent magnetization, providing nonvolatile reconfiguration of the oscillation state. Micro-focused Brillouin light scattering confirms that the nonlinear response is confined to the nanoconstriction region. Lithographic control of the angle between the current and anisotropy axes tunes the excitation threshold and drives two spectral branches from separated modes to a dominant single branch, consistent with mutual synchronization. These results establish epitaxial crystallographic anisotropy as a route to reconfigurable field-free spintronic oscillators and oscillator networks.
ER -