Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields
Abstract Ultrafast heating of FeRh by a femtosecond laser pulse launches a magneto-structural phase transition from an antiferromagnetic to a ferromagnetic state. Aiming to reveal the ultrafast kinetics of this transition, we studied magnetization dynamics with the help of the magneto-optical Kerr e...
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Nature Portfolio
2025-02-01
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| Series: | npj Spintronics |
| Online Access: | https://doi.org/10.1038/s44306-024-00069-6 |
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| author | I. A. Dolgikh T. G. H. Blank A. G. Buzdakov G. Li K. H. Prabhakara S. K. K. Patel R. Medapalli E. E. Fullerton O. V. Koplak J. H. Mentink K. A. Zvezdin A. K. Zvezdin P. C. M. Christianen A. V. Kimel |
| author_facet | I. A. Dolgikh T. G. H. Blank A. G. Buzdakov G. Li K. H. Prabhakara S. K. K. Patel R. Medapalli E. E. Fullerton O. V. Koplak J. H. Mentink K. A. Zvezdin A. K. Zvezdin P. C. M. Christianen A. V. Kimel |
| author_sort | I. A. Dolgikh |
| collection | DOAJ |
| description | Abstract Ultrafast heating of FeRh by a femtosecond laser pulse launches a magneto-structural phase transition from an antiferromagnetic to a ferromagnetic state. Aiming to reveal the ultrafast kinetics of this transition, we studied magnetization dynamics with the help of the magneto-optical Kerr effect in a broad range of temperatures (from 4 K to 400 K) and magnetic fields (up to 25 T). Three different types of ultrafast magnetization dynamics were observed and, using a numerically calculated H-T phase diagram, the differences were explained by different initial states of FeRh corresponding to a (i) collinear antiferromagnetic, (ii) canted antiferromagnetic and (iii) ferromagnetic alignment of spins. We argue that ultrafast heating of FeRh in the canted antiferromagnetic phase launches practically the fastest possible emergence of ferromagnetism in this material. The magnetization emerges on a time scale of 2 ps, which corresponds to the earlier reported time scale of the structural changes during the phase transition. |
| format | Article |
| id | doaj-art-ed55090b79de4ebcbd99393e95933253 |
| institution | Kabale University |
| issn | 2948-2119 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Spintronics |
| spelling | doaj-art-ed55090b79de4ebcbd99393e959332532025-02-09T12:09:30ZengNature Portfolionpj Spintronics2948-21192025-02-01311810.1038/s44306-024-00069-6Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fieldsI. A. Dolgikh0T. G. H. Blank1A. G. Buzdakov2G. Li3K. H. Prabhakara4S. K. K. Patel5R. Medapalli6E. E. Fullerton7O. V. Koplak8J. H. Mentink9K. A. Zvezdin10A. K. Zvezdin11P. C. M. Christianen12A. V. Kimel13Radboud University, Institute for Molecules and MaterialsRadboud University, Institute for Molecules and MaterialsInteractive Fully Electrical Vehicles SrlRadboud University, Institute for Molecules and MaterialsRadboud University, Institute for Molecules and MaterialsCenter for Memory and Recording Research, University of California San DiegoCenter for Memory and Recording Research, University of California San DiegoCenter for Memory and Recording Research, University of California San DiegoInstitute of Problems of Chemical PhysicsRadboud University, Institute for Molecules and MaterialsIstituto P.M. SrlThe Lebedev Physical Institute of the Russian Academy of SciencesHigh Field Magnet Laboratory (HFML - EMFL), Radboud UniversityRadboud University, Institute for Molecules and MaterialsAbstract Ultrafast heating of FeRh by a femtosecond laser pulse launches a magneto-structural phase transition from an antiferromagnetic to a ferromagnetic state. Aiming to reveal the ultrafast kinetics of this transition, we studied magnetization dynamics with the help of the magneto-optical Kerr effect in a broad range of temperatures (from 4 K to 400 K) and magnetic fields (up to 25 T). Three different types of ultrafast magnetization dynamics were observed and, using a numerically calculated H-T phase diagram, the differences were explained by different initial states of FeRh corresponding to a (i) collinear antiferromagnetic, (ii) canted antiferromagnetic and (iii) ferromagnetic alignment of spins. We argue that ultrafast heating of FeRh in the canted antiferromagnetic phase launches practically the fastest possible emergence of ferromagnetism in this material. The magnetization emerges on a time scale of 2 ps, which corresponds to the earlier reported time scale of the structural changes during the phase transition.https://doi.org/10.1038/s44306-024-00069-6 |
| spellingShingle | I. A. Dolgikh T. G. H. Blank A. G. Buzdakov G. Li K. H. Prabhakara S. K. K. Patel R. Medapalli E. E. Fullerton O. V. Koplak J. H. Mentink K. A. Zvezdin A. K. Zvezdin P. C. M. Christianen A. V. Kimel Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields npj Spintronics |
| title | Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields |
| title_full | Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields |
| title_fullStr | Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields |
| title_full_unstemmed | Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields |
| title_short | Ultrafast emergence of ferromagnetism in antiferromagnetic FeRh in high magnetic fields |
| title_sort | ultrafast emergence of ferromagnetism in antiferromagnetic ferh in high magnetic fields |
| url | https://doi.org/10.1038/s44306-024-00069-6 |
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