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Journal Articles Advanced Materials Year : 2017

Ultrafast Magnetization Manipulation Using Single Femtosecond Light and Hot-Electron Pulses

Abstract

Current-induced magnetization manipulation is a key issue for spintronic applications. This manipulation must be fast, deterministic, and nondestructive in order to function in device applications. Therefore, single- electronic-pulse-driven deterministic switching of the magnetization on the picosecond timescale represents a major step toward future developments of ultrafast spintronic systems. Here, the ultrafast magnetization dynamics in engineered Gdx[FeCo]1−x-based structures are studied to compare the effect of femtosecond laser and hot-electron pulses. It is demonstrated that a single femtosecond hot-electron pulse causes deterministic magnetization reversal in either Gd-rich and FeCo-rich alloys similarly to a femtosecond laser pulse. In addition, it is shown that the limiting factor of such manipulation for perpendicular magnetized films arises from the formation of a multidomain state due to dipolar interactions. By performing time-resolved measurements under various magnetic fields, it is demonstrated that the same magnetization dynamics are observed for both light and hot-electron excitation, and that the full magnetization reversal takes place within 40 ps. The efficiency of the ultrafast current-induced magnetization manipulation is enhanced due to the ballistic transport of hot electrons before reaching the GdFeCo magnetic layer.
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Dates and versions

hal-01686942 , version 1 (04-01-2023)

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Yong Xu, Marwan Deb, Grégory Malinowski, Michel Hehn, Weisheng Zhao, et al.. Ultrafast Magnetization Manipulation Using Single Femtosecond Light and Hot-Electron Pulses. Advanced Materials, 2017, 29 (42), pp.1703474 - 1703474. ⟨10.1002/adma.201703474⟩. ⟨hal-01686942⟩
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