Grueneisen-approach for the experimental determination of transient spin and phonon energies from ultrafast x-ray diffraction data: gadolinium
- We study gadolinium thin films as a model system for ferromagnets with negative thermal expansion. Ultrashort laser pulses heat up the electronic subsystem and we follow the transient strain via ultrafast x-ray diffraction. In terms of a simple Grueneisen approach, the strain is decomposed into two contributions proportional to the thermal energy of spin and phonon subsystems. Our analysis reveals that upon femtosecond laser excitation, phonons and spins can be driven out of thermal equilibrium for several nanoseconds.
| Author details: | A. Koc, M. Reinhardt, Alexander von ReppertORCiD, Matthias Rössle, Wolfram LeitenbergerGND, M. Gleich, M. Weinelt, Flavio Zamponi, Matias BargheerORCiDGND |
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| DOI: | https://doi.org/10.1088/1361-648X/aa7187 |
| ISSN: | 0953-8984 |
| ISSN: | 1361-648X |
| Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/28557803 |
| Title of parent work (English): | Journal of physics : Condensed matter |
| Publisher: | IOP Publ. Ltd. |
| Place of publishing: | Bristol |
| Publication type: | Article |
| Language: | English |
| Year of first publication: | 2017 |
| Publication year: | 2017 |
| Release date: | 2020/04/20 |
| Tag: | magnetostriction; nonequilibrium; phonon; rare earth; spin; ultrafast; x-ray diffraction |
| Volume: | 29 |
| Number of pages: | 8 |
| First page: | 5884 |
| Last Page: | 5891 |
| Funding institution: | BMBF; Helmholtz Virtual Institute Dynamic Pathways in Multidimensional Landscapes |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| Peer review: | Referiert |
