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arXiv · 2311.12753

Influence of interlayer exchange coupling on ultrafast laser-induced magnetization reversal in ferromagnetic spin valves

Junta Igarashi·Yann Le Guen·Julius Hohlfeld·Stephane Mangin·Jon Gorchon·Michel Hehn·Gregory Malinowski
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Abstract

In this study, we explore the influence of interlayer exchange coupling on magnetization reversal triggered by femtosecond laser pulses in ferromagnetic spin valves. Our experiments, focused on femtosecond laser-induced magnetization reversal, methodically vary the thickness of the copper (Cu) spacer layer. We identify a critical Cu thickness threshold at 2.32 nm. Above this threshold, a stable reversed magnetic domain is consistently generated upon exposure to a single laser pulse. Conversely, with a Cu spacer thinner than 2.32 nm, the observed magnetization reversal from parallel (P) to anti-parallel (AP) states occurs only under continuous laser irradiation. Once the laser is stopped, the magnetic configuration relaxes back to its initial P state, influenced by ferromagnetic exchange coupling. This research enhances our understanding of the mechanisms that drive optically induced ultrafast magnetization reversal in ferromagnetic spin valves.

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Junta Igarashi, Yann Le Guen, Julius Hohlfeld, Stephane Mangin, Jon Gorchon, Michel Hehn, Gregory Malinowski. 2023-11-21. Influence of interlayer exchange coupling on ultrafast laser-induced magnetization reversal in ferromagnetic spin valves. https://doi.org/10.1103/physrevb.109.094422

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