Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points

Steffen Wittrock (), Salvatore Perna, Romain Lebrun, Katia Ho, Roberta Dutra, Ricardo Ferreira, Paolo Bortolotti, Claudio Serpico and Vincent Cros ()
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Steffen Wittrock: Université Paris-Saclay
Salvatore Perna: University of Naples Federico II
Romain Lebrun: Université Paris-Saclay
Katia Ho: Université Paris-Saclay
Roberta Dutra: Centro Brasileiro de Pesquisas Fésicas (CBPF)
Ricardo Ferreira: International Iberian Nanotechnology Laboratory (INL)
Paolo Bortolotti: Université Paris-Saclay
Claudio Serpico: University of Naples Federico II
Vincent Cros: Université Paris-Saclay

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract The emergence of exceptional points (EPs) in the parameter space of a non-hermitian (2D) eigenvalue problem has long been interest in mathematical physics, however, only in the last decade entered the scope of experiments. In coupled systems, EPs give rise to unique physical phenomena, and enable the development of highly sensitive sensors. Here, we demonstrate at room temperature the emergence of EPs in coupled spintronic nanoscale oscillators and exploit the system’s non-hermiticity. We observe amplitude death of self-oscillations and other complex dynamics, and develop a linearized non-hermitian model of the coupled spintronic system, which describes the main experimental features. The room temperature operation, and CMOS compatibility of our spintronic nanoscale oscillators means that they are ready to be employed in a variety of applications, such as field, current or rotation sensors, radiofrequeny and wireless devices, and in dedicated neuromorphic computing hardware. Furthermore, their unique and versatile properties, notably their large nonlinear behavior, open up unprecedented perspectives in experiments as well as in theory on the physics of exceptional points expanding to strongly nonlinear systems.

Date: 2024
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DOI: 10.1038/s41467-023-44436-z

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