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Terahertz spin dynamics driven by a field-derivative torque
Univ Konstanz, Fachbereich Phys, DE-78457 Constance, Germany.ORCID iD: 0000-0002-4529-0027
Univ Konstanz, Fachbereich Phys, DE-78457 Constance, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0001-8064-2684
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-9069-2631
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 6, article id 060409Article in journal (Refereed) Published
Abstract [en]

Efficient manipulation of magnetization at ultrashort timescales is of particular interest for future technology. Here, we numerically investigate the influence of the so-called field-derivative torque, which was derived earlier based on relativistic Dirac theory [R. Mondal et al., Phys. Rev. B 94, 144419 (2016)], on the spin dynamics triggered by ultrashort laser pulses. We find that only considering the THz Zeeman field can underestimate the spin excitation in antiferromagnetic oxide systems such as, e.g., NiO and CoO. However, accounting for both the THz Zeeman torque and the field-derivative torque, the amplitude of the spin excitation increases significantly. Studying the damping dependence of the field-derivative torque we observe larger effects for materials having larger damping constants.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 6, article id 060409
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-398853DOI: 10.1103/PhysRevB.100.060409ISI: 000482447200001OAI: oai:DiVA.org:uu-398853DiVA, id: diva2:1377341
Funder
Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)Knut and Alice Wallenberg Foundation, 2015.0060Available from: 2019-12-11 Created: 2019-12-11 Last updated: 2019-12-11Bibliographically approved

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Ritzmann, UlrikeOppeneer, Peter M.

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