Element-specific ultrafast lattice dynamics in FePt nanoparticles
Light–matter interaction at the nanoscale in magnetic alloys and heterostructures is a topic of intense research in view of potential applications in high-density magnetic recording. While the element-specific dynamics of electron spins is directly accessible to resonant x-ray pulses with femtosecon...
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC and ACA
2024-11-01
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| Series: | Structural Dynamics |
| Online Access: | http://dx.doi.org/10.1063/4.0000260 |
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| author | Diego Turenne Igor Vaskivskyi Klaus Sokolowski-Tinten Xijie J. Wang Alexander H. Reid Xiaozhe Shen Ming-Fu Lin Suji Park Stephen Weathersby Michael Kozina Matthias C. Hoffmann Jian Wang Jakub Sebesta Yukiko K. Takahashi Oscar Grånäs Peter M. Oppeneer Hermann A. Dürr |
| author_facet | Diego Turenne Igor Vaskivskyi Klaus Sokolowski-Tinten Xijie J. Wang Alexander H. Reid Xiaozhe Shen Ming-Fu Lin Suji Park Stephen Weathersby Michael Kozina Matthias C. Hoffmann Jian Wang Jakub Sebesta Yukiko K. Takahashi Oscar Grånäs Peter M. Oppeneer Hermann A. Dürr |
| author_sort | Diego Turenne |
| collection | DOAJ |
| description | Light–matter interaction at the nanoscale in magnetic alloys and heterostructures is a topic of intense research in view of potential applications in high-density magnetic recording. While the element-specific dynamics of electron spins is directly accessible to resonant x-ray pulses with femtosecond time structure, the possible element-specific atomic motion remains largely unexplored. We use ultrafast electron diffraction (UED) to probe the temporal evolution of lattice Bragg peaks of FePt nanoparticles embedded in a carbon matrix following excitation by an optical femtosecond laser pulse. The diffraction interference between Fe and Pt sublattices enables us to demonstrate that the Fe mean square vibration amplitudes are significantly larger that those of Pt as expected from their different atomic mass. Both are found to increase as energy is transferred from the laser-excited electrons to the lattice. Contrary to this intuitive behavior, we observe a laser-induced lattice expansion that is larger for Pt than for Fe atoms during the first picosecond after laser excitation. This effect points to the strain-wave driven lattice expansion with the longitudinal acoustic Pt motion dominating that of Fe. |
| format | Article |
| id | doaj-art-f1562c52cc6849dc91522f2a05146d75 |
| institution | Kabale University |
| issn | 2329-7778 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | AIP Publishing LLC and ACA |
| record_format | Article |
| series | Structural Dynamics |
| spelling | doaj-art-f1562c52cc6849dc91522f2a05146d752025-01-02T17:18:38ZengAIP Publishing LLC and ACAStructural Dynamics2329-77782024-11-01116064501064501-810.1063/4.0000260Element-specific ultrafast lattice dynamics in FePt nanoparticlesDiego Turenne0Igor Vaskivskyi1Klaus Sokolowski-Tinten2Xijie J. Wang3Alexander H. Reid4Xiaozhe Shen5Ming-Fu Lin6Suji Park7Stephen Weathersby8Michael Kozina9Matthias C. Hoffmann10Jian Wang11Jakub Sebesta12Yukiko K. Takahashi13Oscar Grånäs14Peter M. Oppeneer15Hermann A. Dürr16 Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden Faculty of Physics and Centre for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany Accelerator Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Accelerator Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA Magnetic Materials Unit, National Institute for Materials Science, Tsukuba 305-0047, Japan Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden Magnetic Materials Unit, National Institute for Materials Science, Tsukuba 305-0047, Japan Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, SwedenLight–matter interaction at the nanoscale in magnetic alloys and heterostructures is a topic of intense research in view of potential applications in high-density magnetic recording. While the element-specific dynamics of electron spins is directly accessible to resonant x-ray pulses with femtosecond time structure, the possible element-specific atomic motion remains largely unexplored. We use ultrafast electron diffraction (UED) to probe the temporal evolution of lattice Bragg peaks of FePt nanoparticles embedded in a carbon matrix following excitation by an optical femtosecond laser pulse. The diffraction interference between Fe and Pt sublattices enables us to demonstrate that the Fe mean square vibration amplitudes are significantly larger that those of Pt as expected from their different atomic mass. Both are found to increase as energy is transferred from the laser-excited electrons to the lattice. Contrary to this intuitive behavior, we observe a laser-induced lattice expansion that is larger for Pt than for Fe atoms during the first picosecond after laser excitation. This effect points to the strain-wave driven lattice expansion with the longitudinal acoustic Pt motion dominating that of Fe.http://dx.doi.org/10.1063/4.0000260 |
| spellingShingle | Diego Turenne Igor Vaskivskyi Klaus Sokolowski-Tinten Xijie J. Wang Alexander H. Reid Xiaozhe Shen Ming-Fu Lin Suji Park Stephen Weathersby Michael Kozina Matthias C. Hoffmann Jian Wang Jakub Sebesta Yukiko K. Takahashi Oscar Grånäs Peter M. Oppeneer Hermann A. Dürr Element-specific ultrafast lattice dynamics in FePt nanoparticles Structural Dynamics |
| title | Element-specific ultrafast lattice dynamics in FePt nanoparticles |
| title_full | Element-specific ultrafast lattice dynamics in FePt nanoparticles |
| title_fullStr | Element-specific ultrafast lattice dynamics in FePt nanoparticles |
| title_full_unstemmed | Element-specific ultrafast lattice dynamics in FePt nanoparticles |
| title_short | Element-specific ultrafast lattice dynamics in FePt nanoparticles |
| title_sort | element specific ultrafast lattice dynamics in fept nanoparticles |
| url | http://dx.doi.org/10.1063/4.0000260 |
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