Coherent THz spin dynamics in antiferromagnets beyond the approximation of the Néel vector
Controlled generation of coherent spin waves with highest possible frequencies and shortest possible wavelengths is a cornerstone of spintronics and magnonics. Here, using Heisenberg antiferromagnet RbMnF3, we demonstrate that laser-induced THz spin dynamics corresponding to pairs of mutually cohere...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2024-01-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0180888 |
| _version_ | 1797331902525341696 |
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| author | F. Formisano T. T. Gareev D. I. Khusyainov A. E. Fedianin R. M. Dubrovin P. P. Syrnikov D. Afanasiev R. V. Pisarev A. M. Kalashnikova J. H. Mentink A. V. Kimel |
| author_facet | F. Formisano T. T. Gareev D. I. Khusyainov A. E. Fedianin R. M. Dubrovin P. P. Syrnikov D. Afanasiev R. V. Pisarev A. M. Kalashnikova J. H. Mentink A. V. Kimel |
| author_sort | F. Formisano |
| collection | DOAJ |
| description | Controlled generation of coherent spin waves with highest possible frequencies and shortest possible wavelengths is a cornerstone of spintronics and magnonics. Here, using Heisenberg antiferromagnet RbMnF3, we demonstrate that laser-induced THz spin dynamics corresponding to pairs of mutually coherent counter-propagating spin waves with the wavevectors up to the edge of the Brillouin zone cannot be understood in terms of magnetization and antiferromagnetic (Néel) vectors, conventionally used to describe spin waves. Instead, we propose to model such spin dynamics using the spin correlation function. We derive a quantum-mechanical equation of motion for the latter and emphasize that unlike the magnetization and antiferromagnetic vectors the spin correlations in antiferromagnets do not exhibit inertia. |
| first_indexed | 2024-03-08T07:42:01Z |
| format | Article |
| id | doaj.art-7a13606f67a04861897da480ceb5eb8b |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-03-08T07:42:01Z |
| publishDate | 2024-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-7a13606f67a04861897da480ceb5eb8b2024-02-02T16:57:37ZengAIP Publishing LLCAPL Materials2166-532X2024-01-01121011105011105-610.1063/5.0180888Coherent THz spin dynamics in antiferromagnets beyond the approximation of the Néel vectorF. Formisano0T. T. Gareev1D. I. Khusyainov2A. E. Fedianin3R. M. Dubrovin4P. P. Syrnikov5D. Afanasiev6R. V. Pisarev7A. M. Kalashnikova8J. H. Mentink9A. V. Kimel10Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The NetherlandsInstitute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The NetherlandsInstitute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The NetherlandsIoffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, RussiaIoffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, RussiaIoffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, RussiaInstitute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The NetherlandsIoffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, RussiaIoffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, RussiaInstitute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The NetherlandsInstitute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The NetherlandsControlled generation of coherent spin waves with highest possible frequencies and shortest possible wavelengths is a cornerstone of spintronics and magnonics. Here, using Heisenberg antiferromagnet RbMnF3, we demonstrate that laser-induced THz spin dynamics corresponding to pairs of mutually coherent counter-propagating spin waves with the wavevectors up to the edge of the Brillouin zone cannot be understood in terms of magnetization and antiferromagnetic (Néel) vectors, conventionally used to describe spin waves. Instead, we propose to model such spin dynamics using the spin correlation function. We derive a quantum-mechanical equation of motion for the latter and emphasize that unlike the magnetization and antiferromagnetic vectors the spin correlations in antiferromagnets do not exhibit inertia.http://dx.doi.org/10.1063/5.0180888 |
| spellingShingle | F. Formisano T. T. Gareev D. I. Khusyainov A. E. Fedianin R. M. Dubrovin P. P. Syrnikov D. Afanasiev R. V. Pisarev A. M. Kalashnikova J. H. Mentink A. V. Kimel Coherent THz spin dynamics in antiferromagnets beyond the approximation of the Néel vector APL Materials |
| title | Coherent THz spin dynamics in antiferromagnets beyond the approximation of the Néel vector |
| title_full | Coherent THz spin dynamics in antiferromagnets beyond the approximation of the Néel vector |
| title_fullStr | Coherent THz spin dynamics in antiferromagnets beyond the approximation of the Néel vector |
| title_full_unstemmed | Coherent THz spin dynamics in antiferromagnets beyond the approximation of the Néel vector |
| title_short | Coherent THz spin dynamics in antiferromagnets beyond the approximation of the Néel vector |
| title_sort | coherent thz spin dynamics in antiferromagnets beyond the approximation of the neel vector |
| url | http://dx.doi.org/10.1063/5.0180888 |
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