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arXiv · 1703.03689

Ultrafast and Energy-Efficient Quenching of Spin Order: Antiferromagnetism Beats Ferromagnetism

Nele Thielemann-Kühn·Daniel Schick·Niko Pontius·Christoph Trabant·Rolf Mitzner·Karsten Holldack·Hartmut Zabel·Alexander Föhlisch·Christian Schüßler-Langeheine
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Abstract

By comparing femtosecond laser pulse induced ferro- and antiferromagnetic dynamics in one and the same material - metallic dysprosium - we show both to behave fundamentally different. Antiferromagnetic order is considerably faster and much more efficiently manipulated by optical excitation than its ferromagnetic counterpart. We assign the fast and extremely efficient process in the antiferromagnet to an interatomic transfer of angular momentum within the spin system. Our findings do not only reveal this angular momentum transfer channel effective in antiferromagnets and other magnetic structures with non-parallel spin alignment, they also point out a possible route towards energy-efficient spin manipulation for magnetic devices.

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Nele Thielemann-Kühn, Daniel Schick, Niko Pontius, Christoph Trabant, Rolf Mitzner, Karsten Holldack, Hartmut Zabel, Alexander Föhlisch, Christian Schüßler-Langeheine. 2017-03-10. Ultrafast and Energy-Efficient Quenching of Spin Order: Antiferromagnetism Beats Ferromagnetism. https://doi.org/10.1103/physrevlett.119.197202

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