Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy
Abstract Owing to their high magnon frequencies, antiferromagnets are key materials for future high-speed spintronics. Picosecond switching of antiferromagnetic spin systems has been viewed a milestone for decades and pursued only by using ultrafast external perturbations. Here, we show that picosec...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-11-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-43318-8 |
| _version_ | 1797414529476329472 |
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| author | M. A. Weiss A. Herbst J. Schlegel T. Dannegger M. Evers A. Donges M. Nakajima A. Leitenstorfer S. T. B. Goennenwein U. Nowak T. Kurihara |
| author_facet | M. A. Weiss A. Herbst J. Schlegel T. Dannegger M. Evers A. Donges M. Nakajima A. Leitenstorfer S. T. B. Goennenwein U. Nowak T. Kurihara |
| author_sort | M. A. Weiss |
| collection | DOAJ |
| description | Abstract Owing to their high magnon frequencies, antiferromagnets are key materials for future high-speed spintronics. Picosecond switching of antiferromagnetic spin systems has been viewed a milestone for decades and pursued only by using ultrafast external perturbations. Here, we show that picosecond spin switching occurs spontaneously due to thermal fluctuations in the antiferromagnetic orthoferrite Sm0.7Er0.3FeO3. By analysing the correlation between the pulse-to-pulse polarisation fluctuations of two femtosecond optical probes, we extract the autocorrelation of incoherent magnon fluctuations. We observe a strong enhancement of the magnon fluctuation amplitude and the coherence time around the critical temperature of the spin reorientation transition. The spectrum shows two distinct features, one corresponding to the quasi-ferromagnetic mode and another one which has not been previously reported in pump-probe experiments. Comparison to a stochastic spin dynamics simulation reveals this new mode as smoking gun of ultrafast spontaneous spin switching within the double-well anisotropy potential. |
| first_indexed | 2024-03-09T05:34:38Z |
| format | Article |
| id | doaj.art-955b433c62d44593832ac5fdb0190ac6 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-09T05:34:38Z |
| publishDate | 2023-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-955b433c62d44593832ac5fdb0190ac62023-12-03T12:29:51ZengNature PortfolioNature Communications2041-17232023-11-011411910.1038/s41467-023-43318-8Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopyM. A. Weiss0A. Herbst1J. Schlegel2T. Dannegger3M. Evers4A. Donges5M. Nakajima6A. Leitenstorfer7S. T. B. Goennenwein8U. Nowak9T. Kurihara10Department of Physics, University of KonstanzDepartment of Physics, University of KonstanzDepartment of Physics, University of KonstanzDepartment of Physics, University of KonstanzDepartment of Physics, University of KonstanzDepartment of Physics, University of KonstanzInstitute of Laser Engineering, Osaka UniversityDepartment of Physics, University of KonstanzDepartment of Physics, University of KonstanzDepartment of Physics, University of KonstanzDepartment of Physics, University of KonstanzAbstract Owing to their high magnon frequencies, antiferromagnets are key materials for future high-speed spintronics. Picosecond switching of antiferromagnetic spin systems has been viewed a milestone for decades and pursued only by using ultrafast external perturbations. Here, we show that picosecond spin switching occurs spontaneously due to thermal fluctuations in the antiferromagnetic orthoferrite Sm0.7Er0.3FeO3. By analysing the correlation between the pulse-to-pulse polarisation fluctuations of two femtosecond optical probes, we extract the autocorrelation of incoherent magnon fluctuations. We observe a strong enhancement of the magnon fluctuation amplitude and the coherence time around the critical temperature of the spin reorientation transition. The spectrum shows two distinct features, one corresponding to the quasi-ferromagnetic mode and another one which has not been previously reported in pump-probe experiments. Comparison to a stochastic spin dynamics simulation reveals this new mode as smoking gun of ultrafast spontaneous spin switching within the double-well anisotropy potential.https://doi.org/10.1038/s41467-023-43318-8 |
| spellingShingle | M. A. Weiss A. Herbst J. Schlegel T. Dannegger M. Evers A. Donges M. Nakajima A. Leitenstorfer S. T. B. Goennenwein U. Nowak T. Kurihara Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy Nature Communications |
| title | Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy |
| title_full | Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy |
| title_fullStr | Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy |
| title_full_unstemmed | Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy |
| title_short | Discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy |
| title_sort | discovery of ultrafast spontaneous spin switching in an antiferromagnet by femtosecond noise correlation spectroscopy |
| url | https://doi.org/10.1038/s41467-023-43318-8 |
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