Journal
ADVANCED MATERIALS
Volume 29, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201703474
Keywords
electronic transport effects; ferrimagnetics; magneto-optical effects; ultrafast magnetization dynamics and switching; ultrafast spectroscopy
Categories
Funding
- Agence National de la recherche in France via the project COMAG (Materials World Network: New functionality in COmplex MAGnetic structures with perpendicular anisotropy) [ANR-13-IS04-0008-01]
- Agence National de la recherche in France via the project UMANI (Understanding the mechanism of ultrafast all optical switching) [ANR-15-CE24-0009]
- French PIA (Programme d'Investissements d'Avenir) project Lorraine Universite d'Excellence, [ANR-15-IDEX-04-LUE]
- FEDER (European Regional Development Fund)
- PIA
- Region Grand Est
- Metropole Grand Nancy
- ICEEL (Institut Carnot)
- Agence Nationale de la Recherche (ANR) [ANR-15-CE24-0009] Funding Source: Agence Nationale de la Recherche (ANR)
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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 Gd-x[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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