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

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:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4];  [4]; ORCiD logo [3];  [5]; ORCiD logo [3]; ORCiD logo [6]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [7]; ORCiD logo [8];  [7];  [1]
  1. University of Colorado and NIST, Boulder, Colorado (United States). Department of Physics and JILA
  2. University of Kaiserslautern (Germany). Research Center OPTIMAS
  3. National Institute of Standards and Technology, Boulder, Colorado (United States). Quantum Electromagnetics Division
  4. University Uppsala (Sweden). Department of Physics and Astronomy
  5. University of Colorado and NIST, Boulder, Colorado (United States). Department of Physics and JILA; National Institute of Standards and Technology, Boulder, Colorado (United States). Quantum Electromagnetics Division
  6. Physikalisches Institut (Germany). Georg-August-Universität Göttingen
  7. University Uppsala (Sweden). Department of Physics and Astronomy; Örebro University (Sweden). School of Science and Technology
  8. Luleå University (Sweden). Department of Engineering Sciences and Mathematics
Publication Date:
Research Org.:
Univ. of Colorado, Boulder, CO (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1626056
Alternate Identifier(s):
OSTI ID: 1678721
Grant/Contract Number:  
SC0002002; SC0017643
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Science & Technology - Other Topics

Citation Formats

Tengdin, Phoebe, Gentry, Christian, Blonsky, Adam, Zusin, Dmitriy, Gerrity, Michael, Hellbrück, Lukas, Hofherr, Moritz, Shaw, Justin, Kvashnin, Yaroslav, Delczeg-Czirjak, Erna K., Arora, Monika, Nembach, Hans, Silva, Tom J., Mathias, Stefan, Aeschlimann, Martin, Kapteyn, Henry C., Thonig, Danny, Koumpouras, Konstantinos, Eriksson, Olle, and Murnane, Margaret M. Direct light–induced spin transfer between different elements in a spintronic Heusler material via femtosecond laser excitation. United States: N. p., 2020. Web. doi:10.1126/sciadv.aaz1100.
Tengdin, Phoebe, Gentry, Christian, Blonsky, Adam, Zusin, Dmitriy, Gerrity, Michael, Hellbrück, Lukas, Hofherr, Moritz, Shaw, Justin, Kvashnin, Yaroslav, Delczeg-Czirjak, Erna K., Arora, Monika, Nembach, Hans, Silva, Tom J., Mathias, Stefan, Aeschlimann, Martin, Kapteyn, Henry C., Thonig, Danny, Koumpouras, Konstantinos, Eriksson, Olle, & Murnane, Margaret M. Direct light–induced spin transfer between different elements in a spintronic Heusler material via femtosecond laser excitation. United States. doi:10.1126/sciadv.aaz1100.
Tengdin, Phoebe, Gentry, Christian, Blonsky, Adam, Zusin, Dmitriy, Gerrity, Michael, Hellbrück, Lukas, Hofherr, Moritz, Shaw, Justin, Kvashnin, Yaroslav, Delczeg-Czirjak, Erna K., Arora, Monika, Nembach, Hans, Silva, Tom J., Mathias, Stefan, Aeschlimann, Martin, Kapteyn, Henry C., Thonig, Danny, Koumpouras, Konstantinos, Eriksson, Olle, and Murnane, Margaret M. Wed . "Direct light–induced spin transfer between different elements in a spintronic Heusler material via femtosecond laser excitation". United States. doi:10.1126/sciadv.aaz1100. https://www.osti.gov/servlets/purl/1626056.
@article{osti_1626056,
title = {Direct light–induced spin transfer between different elements in a spintronic Heusler material via femtosecond laser excitation},
author = {Tengdin, Phoebe and Gentry, Christian and Blonsky, Adam and Zusin, Dmitriy and Gerrity, Michael and Hellbrück, Lukas and Hofherr, Moritz and Shaw, Justin and Kvashnin, Yaroslav and Delczeg-Czirjak, Erna K. and Arora, Monika and Nembach, Hans and Silva, Tom J. and Mathias, Stefan and Aeschlimann, Martin and Kapteyn, Henry C. and Thonig, Danny and Koumpouras, Konstantinos and Eriksson, Olle and Murnane, Margaret M.},
abstractNote = {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.},
doi = {10.1126/sciadv.aaz1100},
journal = {Science Advances},
issn = {2375-2548},
number = 3,
volume = 6,
place = {United States},
year = {2020},
month = {1}
}

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