Single-Shot Magnetization Reversal in Ferromagnetic Spin Valves via Heat Control

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Abstract
We study laser-induced ultrafast magnetization reversal in a ferromagnetic spin valve by comparing the effects of direct laser excitation and ultrashort hot-electron pulses. A wedged Cu layer is deposited atop the spin valve to tune energy transmission to the magnetic stack for both optical and hot-electron excitation. We demonstrate single-shot magnetization reversal of the free layer using hot-electron pulses. Moreover, such reversal is achieved even with picosecond laser pulses. The influence of laser fluence, Cu thickness (t_{Cu}), and pulse duration is investigated in detail. Our results indicate that the key factor enabling magnetization reversal is full demagnetization of the free layer, driven by a rapid rise in its electronic temperature-achieved via either direct laser or hot-electron excitation. This work advances the understanding of ultrafast magnetization reversal via nonlocal heat and spin transport under strongly out-of-equilibrium conditions.
Funding Information
  • Agence Nationale de la Recherche (ANR-22-PEEL-0009, ANR- 20-CE24- 0003, SLAM ANR- 23-CE30-0047, ANR-15- IDEX-04-LUE)
  • European Commission (22J22178)
  • Research Council of Finland (316857)
  • Sakura Science Exchange Program
  • Japan Society for the Promotion of Science (24K22964)
  • Tohoku University
  • European Cooperation in Science and Technology (CA23136 CHIROMAG)
  • Japan Science and Technology Agency (JPMJAP2409)
  • Institute Carnot ICEEL
  • région grand est
  • Metropole Grand Nancy
  • Grant-in-Aid for Transformative Research Areas (24H02235)

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