Femtosecond coherent magnonic manipulation of antiferromagnetism
The wildly growing field of antiferromagnetic spintronics is currently addressing several fundamental questions. A major topic of investigation concerns the generation and manipulation of coherent magnons on the ultrafast timescale. The development of novel pulsed-laser sources has enabled scientists to address the following scientific question: which magnetic excited state can be induced by resonantly drive coherent magnons throughout the Brillouin zone? In my talk I will outline our approach to this open issue, which relies on the resonant drive of pairs of high-energy magnons in the weak ferromagnet α-Fe2O3, with wavevector near the edges of the Brillouin zone. This unprecedented concept results in strongly perturbing the entire magnetic system of the material, in particular: i) magnon modes with different wavevectors are excited and amplified; ii) the eigenfrequencies of magnons are modified, which demonstrates a modification of the magnon dispersion; iii) coupling between magnon modes that are orthogonal eigenstates of the magnetic Hamiltonian of the material is observed. All these groundbreaking observations are rationalised in view of a resonant impulsive stimulated Raman scattering mechanism. The perspective of our results in terms of femtosecond coherent magnonics will be discussed.
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- Date: 13 Mar 2023
- Time: 11:00 AM to 12:00 PM
- All times are (UTC-06:00) Mountain Time (US & Canada)
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- 1420 Austin Bluffs Pkwy
- Colorado Springs, Colorado
- United States 80918
- Building: Osborne Center for Science and Engineering
- Room Number: A204
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- Co-sponsored by UCCS
Speakers
Davide Bossini of University of Konstanz
Femtosecond coherent magnonic manipulation of antiferromagnetism
The wildly growing field of antiferromagnetic spintronics is currently addressing several fundamental questions. A major topic of investigation concerns the generation and manipulation of coherent magnons on the ultrafast timescale. The development of novel pulsed-laser sources has enabled scientists to address the following scientific question: which magnetic excited state can be induced by resonantly drive coherent magnons throughout the Brillouin zone? In my talk I will outline our approach to this open issue, which relies on the resonant drive of pairs of high-energy magnons in the weak ferromagnet α-Fe2O3, with wavevector near the edges of the Brillouin zone. This unprecedented concept results in strongly perturbing the entire magnetic system of the material, in particular: i) magnon modes with different wavevectors are excited and amplified; ii) the eigenfrequencies of magnons are modified, which demonstrates a modification of the magnon dispersion; iii) coupling between magnon modes that are orthogonal eigenstates of the magnetic Hamiltonian of the material is observed. All these groundbreaking observations are rationalised in view of a resonant impulsive stimulated Raman scattering mechanism. The perspective of our results in terms of femtosecond coherent magnonics will be discussed.
Biography:
Davide Bossini got his PhD in Nijmegen (The Netherlands) from the group of Prof. Theo Rasing and Prof. Alexey Kimel in 2015. He moved to Tokyo to work as a postdoc in the group of Prof. Kuwata-Gonokami, supported by a fellowiship of the Japanese Society for the Promotion of Science (JSPS). In 2017 he moved to Germany (TU Dortmund), where he took a position of senior postdoc. Shortly after, he was awarded the Emmy Noether grant from the German science foundation (DFG), allowing him to establish his independent junior group with the support of a host in a German academic institution. He moved to Konstanz where, hosted by Prof. Alfred Leitenstorfer he is developing his research group.
In 2017 he received a postdoc Award from the journal Applied Sciences. In 2019 he was awarded the early-career Award from the IEEE Magnetics Society.
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