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THz-driven demagnetization with perpendicular magnetic anisotropy: towards ultrafast ballistic switching
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 62018 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 51, no 8, article id 084001Article in journal (Refereed) Published
Abstract [en]

We study THz-driven spin dynamics in thin CoPt films with perpendicular magnetic anisotropy. Femtosecond magneto-optical Kerr effect measurements show that demagnetization amplitude of about 1% can be achieved with a peak THz electric field of 300 kV cm(-1), and a corresponding peak magnetic field of 0.1 T. The effect is more than an order of magnitude larger than observed in samples with easy-plane anisotropy irradiated with the same field strength. We also utilize finite-element simulations to design a meta-material structure that can enhance the THz magnetic field by more than an order of magnitude, over an area of several tens of square micrometers. Magnetic fields exceeding 1 Tesla, generated in such meta-materials with the available laser-based THz sources, are expected to produce full magnetization reversal via ultrafast ballistic precession driven by the THz radiation. Our results demonstrate the possibility of table-top ultrafast magnetization reversal induced by THz radiation.

Place, publisher, year, edition, pages
2018. Vol. 51, no 8, article id 084001
Keywords [en]
ultrafast demagnetization, terahertz, perpendicular magnetic anisotropy, spin transport, metamaterials
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-153611DOI: 10.1088/1361-6463/aaa863ISI: 000424036900001OAI: oai:DiVA.org:su-153611DiVA, id: diva2:1190014
Available from: 2018-03-13 Created: 2018-03-13 Last updated: 2018-03-13Bibliographically approved

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Polley, DebanjanHudl, MatthiasBonetti, Stefano
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