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Laser-induced terahertz spin transport in magnetic nanostructures arises from the same force as ultrafast demagnetization

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10453833" target="_blank" >RIV/00216208:11320/22:10453833 - isvavai.cz</a>

  • Result on the web

    <a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=kHjmQZ.Kui" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=kHjmQZ.Kui</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1103/PhysRevB.106.144427" target="_blank" >10.1103/PhysRevB.106.144427</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Laser-induced terahertz spin transport in magnetic nanostructures arises from the same force as ultrafast demagnetization

  • Original language description

    Laser-induced terahertz spin transport (TST) and ultrafast demagnetization (UDM) are central but so far disconnected phenomena in femtomagnetism and terahertz spintronics. Here, we use broadband terahertz emission spectroscopy to reliably measure both processes in one setup. We find that the rate of UDM in a single simple ferromagnetic metal film F such as Co70Fe30 or Ni80Fe20 has the same time evolution as TST from F into an adjacent normal-metal layer N such as Pt or W. As this remarkable agreement refers to two very different samples, an F layer vs an F|N stack, it does not result from the trivial fact that TST out of F reduces the F magnetization at the same rate. Instead, our observation strongly suggests that UDM in F and TST in F|N are driven by the same force, which is fully determined by the state of the ferromagnet. An analytical model quantitatively explains our measurements and reveals that both UDM in the F sample and TST in the associated F|N stack arise from a generalized spin voltage, i.e., an excess of magnetization, which is defined for arbitrary, nonthermal electron distributions. We also conclude that contributions due to a possible temperature difference between F and N, i.e., the spin-dependent Seebeck effect, and optical intersite spin transfer are minor in our experiment. Based on these findings, one can apply the vast knowledge of UDM to TST to significantly increase spin-current amplitudes and, thus, open promising pathways toward energy-efficient ultrafast spintronic devices.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2022

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Physical Review B

  • ISSN

    2469-9950

  • e-ISSN

    2469-9969

  • Volume of the periodical

    106

  • Issue of the periodical within the volume

    14

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    22

  • Pages from-to

    144427

  • UT code for WoS article

    000878594200002

  • EID of the result in the Scopus database

    2-s2.0-85141498409