Direct light–induced spin transfer between different elements in a spintronic Heusler material via femtosecond laser excitation

Document identifier: oai:DiVA.org:ltu-78023
Access full text here:10.1126/sciadv.aaz1100
Keyword: Natural Sciences, Physical Sciences, Other Physics Topics, Naturvetenskap, Fysik, Annan fysik, Applied Physics, Tillämpad fysik
Publication year: 2020
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Abstract:

Heusler compounds are exciting materials for future spintronics applications because they display a wide range of tunable electronic and magnetic interactions. Here, we use a femtosecond laser to directly transfer spin polarization from one element to another in a half-metallic Heusler material, Co2MnGe. This spin transfer initiates as soon as light is incident on the material, demonstrating spatial transfer of angular momentum between neighboring atomic sites on time scales < 10 fs. Using ultrafast high harmonic pulses to simultaneously and independently probe the magnetic state of two elements during laser excitation, we find that the magnetization of Co is enhanced, while that of Mn rapidly quenches. Density functional theory calculations show that the optical excitation directly transfers spin from one magnetic sublattice to another through preferred spin-polarized excitation pathways. This direct manipulation of spins via light provides a path toward spintronic devices that can operate on few-femtosecond or faster time scales.

Authors

Phoebe Tengdin

Department of Physics and JILA, University of Colorado and NIST, Boulder, CO, USA
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Christian Gentry

Department of Physics and JILA, University of Colorado and NIST, Boulder, CO, USA.
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Adam Blonsky

Department of Physics and JILA, University of Colorado and NIST, Boulder, CO, USA.
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Dmitriy Zusin

Department of Physics and JILA, University of Colorado and NIST, Boulder, CO, USA.
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Michael Gerrity

Department of Physics and JILA, University of Colorado and NIST, Boulder, CO, USA.
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Lukas Hellbrück

Research Center OPTIMAS, University of Kaiserslautern, Kaiserslautern, Germany
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Moritz Hofherr

Research Center OPTIMAS, University of Kaiserslautern, Kaiserslautern, Germany
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Justin Shaw

Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, USA.
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Yaroslav Kvashnin

Department of Physics and Astronomy, University Uppsala, Uppsala, Sweden
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Erna K. Delczeg-Czirjak

Department of Physics and Astronomy, University Uppsala, Uppsala, Sweden
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Monika Arora

Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, USA.
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Hans Nembach

Department of Physics and JILA, University of Colorado and NIST, Boulder, CO, USA. Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, USA
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Tom J. Silva

Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, USA.
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Stefan Mathias

Georg-August-Universität Göttingen, I. Physikalisches Institut, Göttingen, Germany
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Martin Aeschlimann

Research Center OPTIMAS, University of Kaiserslautern, Kaiserslautern, Germany
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Henry C. Kapteyn

Department of Physics and JILA, University of Colorado and NIST, Boulder, CO, USA
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Danny Thonig

Department of Physics and Astronomy, University Uppsala,Uppsala, Sweden.School of Science and Technology, Örebro University, Örebro, Sweden.
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Konstantinos Koumpouras

Luleå tekniska universitet; Materialvetenskap
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Olle Eriksson

Department of Physics and Astronomy, University Uppsala,Uppsala, Sweden.School of Science and Technology, Örebro University, Örebro, Sweden.
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Margaret M. Murnane

Department of Physics and JILA, University of Colorado and NIST, Boulder, CO, USA
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