Nanoscale Mapping of Magnetic Auto-oscillations with a single Spin Sensor
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913401765101568 |
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| author | Hache, Toni Anshu, Anshu Shalomayeva, Tetyana Stöhr, Rainer Kern, Klaus Wrachtrup, Jörg Singha, Aparajita |
| author_facet | Hache, Toni Anshu, Anshu Shalomayeva, Tetyana Stöhr, Rainer Kern, Klaus Wrachtrup, Jörg Singha, Aparajita |
| contents | Magnetic auto-oscillations are damping-compensated magnetization precessions. They can be generated in spin Hall nano-oscillators (SHNO) among others. Current research on these devices is dedicated to create next generation energy-efficient hardware for communication technologies. However, the underlying physics governing the formation of auto-oscillation modes, their output power and line width in a single SHNO device have remained elusive so far. We image the sources of magnetic auto-oscillations in a metallic SHNO using a single spin quantum sensor. We directly measure the microwave field generated by an auto-oscillation spot at the nanoscale by driving the electron spin resonance transition of the sensor spin, enabling faster acquisition speed (100 ms/pixel). Instead of being defined by the points of the largest antidamping only, we experimentally demonstrate for the first time with quantitative magnetometry that the auto-oscillation spots are determined by the positions of the magnetic field minima. The latter act as local potential wells for confining spin-waves, thus supporting large amplitude auto-oscillations. By comparing the magnitude of the magnetic stray field at these spots, we decipher the different frequencies of the auto-oscillation modes. The insights gained regarding the interaction between auto-oscillation modes and spin-wave potential wells enable advanced engineering of real devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_15849 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nanoscale Mapping of Magnetic Auto-oscillations with a single Spin Sensor Hache, Toni Anshu, Anshu Shalomayeva, Tetyana Stöhr, Rainer Kern, Klaus Wrachtrup, Jörg Singha, Aparajita Mesoscale and Nanoscale Physics Applied Physics Optics Quantum Physics Magnetic auto-oscillations are damping-compensated magnetization precessions. They can be generated in spin Hall nano-oscillators (SHNO) among others. Current research on these devices is dedicated to create next generation energy-efficient hardware for communication technologies. However, the underlying physics governing the formation of auto-oscillation modes, their output power and line width in a single SHNO device have remained elusive so far. We image the sources of magnetic auto-oscillations in a metallic SHNO using a single spin quantum sensor. We directly measure the microwave field generated by an auto-oscillation spot at the nanoscale by driving the electron spin resonance transition of the sensor spin, enabling faster acquisition speed (100 ms/pixel). Instead of being defined by the points of the largest antidamping only, we experimentally demonstrate for the first time with quantitative magnetometry that the auto-oscillation spots are determined by the positions of the magnetic field minima. The latter act as local potential wells for confining spin-waves, thus supporting large amplitude auto-oscillations. By comparing the magnitude of the magnetic stray field at these spots, we decipher the different frequencies of the auto-oscillation modes. The insights gained regarding the interaction between auto-oscillation modes and spin-wave potential wells enable advanced engineering of real devices. |
| title | Nanoscale Mapping of Magnetic Auto-oscillations with a single Spin Sensor |
| topic | Mesoscale and Nanoscale Physics Applied Physics Optics Quantum Physics |
| url | https://arxiv.org/abs/2406.15849 |