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• W4380086731 abstract "We investigate the ultrafast demagnetization in ${mathrm{Co}}_{2}mathrm{Mn}{mathrm{Si}}_{1text{--}x}{mathrm{Al}}_{x}$ quaternary Heusler compounds induced by terahertz (THz) and infrared (IR) pulses. Adjusting the alloy's composition allows us to tailor the spin polarization at the Fermi energy from $97%ifmmodepmelsetextpmfi{}3%$ $({mathrm{Co}}_{2}mathrm{MnSi})$ due to its minority spin gap around 0.6 eV, down to $63%ifmmodepmelsetextpmfi{}3%$ $({mathrm{Co}}_{2}mathrm{MnAl})$ without a spin gap. Here we experimentally compare the cases of ultrafast demagnetization, when the material is excited with the help of laser pulses with photon energies below and above the minority spin gap, respectively. More particularly, the pump-photon energies were tuned from 1.02 eV (IR) down to 4.1 meV (THz). We found that the ultrafast demagnetization time decreases upon substitution of Si by Al and thus destroys the minority spin gap. Moreover, a decrease of the pump-photon energies in the near-infrared spectral range results in a slight increase of the demagnetization time. Nevertheless, further decrease of the photon energy by a factor of 250 hardly changes the characteristic time of ultrafast demagnetization. Both THz and IR pulses cause very similar ultrafast magnetization dynamics in our ${mathrm{Co}}_{2}mathrm{Mn}{mathrm{Si}}_{1text{--}x}{mathrm{Al}}_{x}$ Heusler compounds." @default.
• W4380086731 created "2023-06-10" @default.
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• W4380086731 date "2023-06-09" @default.
• W4380086731 modified "2023-10-16" @default.
• W4380086731 title "Ultrafast demagnetization of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Co</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Mn</mml:mi><mml:msub><mml:mi>Si</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mtext>–</mml:mtext><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Al</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math> Heusler compounds using terahertz and infrared light" @default.
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• W4380086731 doi "https://doi.org/10.1103/physrevb.107.224408" @default.
• W4380086731 hasPublicationYear "2023" @default.
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