Hybrid spin Hall nano-oscillators based on ferromagnetic metal/ferrimagnetic insulator heterostructures

Haowen Ren (), Xin Yu Zheng, Sanyum Channa, Guanzhong Wu, Daisy A. O’Mahoney, Yuri Suzuki and Andrew D. Kent ()
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Haowen Ren: New York University
Xin Yu Zheng: Stanford University
Sanyum Channa: Stanford University
Guanzhong Wu: New York University
Daisy A. O’Mahoney: Stanford University
Yuri Suzuki: Stanford University
Andrew D. Kent: New York University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Spin-Hall nano-oscillators (SHNOs) are promising spintronic devices to realize current controlled GHz frequency signals in nanoscale devices for neuromorphic computing and creating Ising systems. However, traditional SHNOs devices based on transition metals have high auto-oscillation threshold currents as well as low quality factors and output powers. Here we demonstrate a new type of hybrid SHNO based on a permalloy (Py) ferromagnetic-metal nanowire and low-damping ferrimagnetic insulator, in the form of epitaxial lithium aluminum ferrite (LAFO) thin films. The superior characteristics of such SHNOs are associated with the excitation of larger spin-precession angles and volumes. We further find that the presence of the ferrimagnetic insulator enhances the auto-oscillation amplitude of spin-wave edge modes, consistent with our micromagnetic modeling. This hybrid SHNO expands spintronic applications, including providing new means of coupling multiple SHNOs for neuromorphic computing and advancing magnonics.

Date: 2023
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DOI: 10.1038/s41467-023-37028-4

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