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  • Letter
  • Open Access

Element-selective ultrafast magnetization dynamics of hybrid Stoner-Heisenberg magnets

Mohamed F. Elhanoty1,*, Olle Eriksson1,2, Ronny Knut1, Olof Karis1, and Oscar Grånäs1,†

  • 1Division of Materials Theory, Department of Physics and Astronomy, Uppsala University, Box-516, SE 75120 Uppsala, Sweden
  • 2School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden

  • *mohamed.elhanoty@physics.uu.se
  • †Corresponding author: oscar.granas@physics.uu.se
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Phys. Rev. B 105, L100401 – Published 2 March, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L100401

Abstract

Stoner and Heisenberg excitations in magnetic materials are inherently different. The first involves an effective reduction of the exchange splitting, whereas the second comprises excitation of spin waves. In this work, we test the impact of these two excitations in the hybrid Stoner-Heisenberg system of FePd. We present a microscopic picture of ultrafast demagnetization dynamics in this alloy, which represents both components of strong local exchange splitting in Fe and induced polarization in Pd. We identify the spin-orbit coupling (SOC) and the optical intersite spin transfer (OISTR) as the two dominant factors for demagnetization at ultrashort timescales. Remarkably, the drastic difference in the origin of the magnetic moment of the Fe and Pd species is not deciding the initial magnetization dynamics in this alloy. By tuning the external laser pulse, the extrinsic OISTR can be manipulated for site-selective demagnetization on femtosecond timescales providing the fastest way for optical and selective control of the magnetization dynamics in alloys. Saliently, our results signify why various experiments demonstrating OISTR might obtain conflicting results.

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Phys. Rev. B 105, L100401– Published 2 March, 2022
  • Received 30 November 2021
  • Revised 7 February 2022
  • Accepted 18 February 2022
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