Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points
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arXiv
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| Format: | Preprint |
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2021
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| author | Wittrock, Steffen Perna, Salvatore Lebrun, Romain Ho, Katia Dutra, Roberta Ferreira, Ricardo Bortolotti, Paolo Serpico, Claudio Cros, Vincent |
| author_facet | Wittrock, Steffen Perna, Salvatore Lebrun, Romain Ho, Katia Dutra, Roberta Ferreira, Ricardo Bortolotti, Paolo Serpico, Claudio Cros, Vincent |
| contents | The emergence of exceptional points (EPs) in the parameter space of a non-hermitian (2D) eigenvalue problem is studied in a general sense in mathematical physics, and has in the last decade successively reached the scope of experiments. In coupled systems, it gives rise to unique physical phenomena, which enable novel approaches for the development of seminal types of highly sensitive sensors. Here, we demonstrate at room temperature the emergence of EPs in coupled spintronic nanoscale oscillators and hence exploit the system's non-hermiticity. We describe the observation of amplitude death of self-oscillations and other complex dynamics, and develop a linearized non-hermitian model of the coupled spintronic system, which properly describes the main experimental features. Interestingly, these spintronic nanoscale oscillators are deployment-ready in different applicational technologies, such as field, current or rotation sensors, radiofrequeny and wireless devices and, more recently, novel neuromorphic hardware solutions. 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. Furthermore, the exploitation of EPs in spintronics devises a new paradigm for ultrasensitive nanoscale sensors and the implementation of complex dynamics in the framework of non-conventional computing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2108_04804 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points Wittrock, Steffen Perna, Salvatore Lebrun, Romain Ho, Katia Dutra, Roberta Ferreira, Ricardo Bortolotti, Paolo Serpico, Claudio Cros, Vincent Mesoscale and Nanoscale Physics The emergence of exceptional points (EPs) in the parameter space of a non-hermitian (2D) eigenvalue problem is studied in a general sense in mathematical physics, and has in the last decade successively reached the scope of experiments. In coupled systems, it gives rise to unique physical phenomena, which enable novel approaches for the development of seminal types of highly sensitive sensors. Here, we demonstrate at room temperature the emergence of EPs in coupled spintronic nanoscale oscillators and hence exploit the system's non-hermiticity. We describe the observation of amplitude death of self-oscillations and other complex dynamics, and develop a linearized non-hermitian model of the coupled spintronic system, which properly describes the main experimental features. Interestingly, these spintronic nanoscale oscillators are deployment-ready in different applicational technologies, such as field, current or rotation sensors, radiofrequeny and wireless devices and, more recently, novel neuromorphic hardware solutions. 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. Furthermore, the exploitation of EPs in spintronics devises a new paradigm for ultrasensitive nanoscale sensors and the implementation of complex dynamics in the framework of non-conventional computing. |
| title | Non-hermiticity in spintronics: oscillation death in coupled spintronic nano-oscillators through emerging exceptional points |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2108.04804 |