Highly efficient all-optical switching of magnetization in GdFeCo microstructures by interference-enhanced absorption of light

Savoini, Matteo; Medapalli, Rajasekhar; Koene, Benny; Khorsand, A.R.; Guyader, Löic Le; Duó, Lamberto; Finazzi, Marco; Tsukamoto, Arata; Itoh, A.; Nolting, F.; Kirilyuk, Andrei; Kimel, A.V.; Rasing, T.H.M.

doi:10.1103/physrevb.86.140404

Cited by 54 publications

(50 citation statements)

References 21 publications

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“…It must be noted that these effects are not only present at 16°grazing incidence as shown here but also at normal incidence as previously shown by simulation 28 . The grazing incidence geometry offers an additional degree of freedom such that depending on the orientation of the boundary with respect to the propagation wave vector of the light pulse, different continuity relations take place, resulting in different Fresnel coefficients 34 .…”

Section: Resultssupporting

confidence: 58%

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Nanoscale sub-100 picosecond all-optical magnetization switching in GdFeCo microstructures

et al. 2015

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Ultrafast magnetization reversal driven by femtosecond laser pulses has been shown to be a promising way to write information. Seeking to improve the recording density has raised intriguing fundamental questions about the feasibility of combining ultrafast temporal resolution with sub-wavelength spatial resolution for magnetic recording. Here we report on the experimental demonstration of nanoscale sub-100 ps all-optical magnetization switching, providing a path to sub-wavelength magnetic recording. Using computational methods, we reveal the feasibility of nanoscale magnetic switching even for an unfocused laser pulse. This effect is achieved by structuring the sample such that the laser pulse, via both refraction and interference, focuses onto a localized region of the structure, the position of which can be controlled by the structural design. Time-resolved photo-emission electron microscopy studies reveal that nanoscale magnetic switching employing such focusing can be pushed to the sub-100 ps regime.

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Section: Resultssupporting

confidence: 58%

“…1f,l. Furthermore, the total absorbed energy increases by a factor of 2 from the largest to the smallest structures, making the smaller structures more absorbing and thus more energy efficient as previously reported 28 .…”

Section: Resultssupporting

confidence: 55%

Nanoscale sub-100 picosecond all-optical magnetization switching in GdFeCo microstructures

et al. 2015

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“…The TRMO signal gradually increases within 400 fs due to ultrafast photo-induced demagnetization. 30 After 10 ps, a reversal of the magnetization orientation is observed. The magnetic nature of the signal was confirmed by the dependence with respect to the orientation of the external field.…”

Section: Resultsmentioning

confidence: 98%

“…The excitation fluence was limited to 13 mJ/cm 2 , to avoid any risk of sample damage. 30 The probe Rev. Sci.…”

Section: Resultsmentioning

confidence: 99%

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Ultrafast time-resolved magneto-optical imaging of all-optical switching in GdFeCo with femtosecond time-resolution and a μm spatial-resolution

Hashimoto

Khorsand

Savoini

et al. 2014

Review of Scientific Instruments

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We developed an ultrafast time-resolved magneto-optical (MO) imaging system with several millidegree resolution of light polarization angle, 100 fs time-resolution, and a micrometer spatial resolution. A CCD camera with about 10(6) pixels is used for detection and MO images with an absolute angle of the light polarization are acquired by the rotating analyzer method. By optimizing the analysis procedure with a least square method and the help of graphical processor units, this novel system significantly improves the speed for MO imaging, allowing to obtain a MO map of a sample within 15 s. To demonstrate the strength of the technique, we applied the method in a pump-and-probe experiment of all-optical switching in a GdFeCo sample in which we were able to detect temporal evolution of the MO images with sub-picosecond resolution.

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

Deb

Malinowski

et al. 2017

Advanced Materials

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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 [FeCo] -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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Highly efficient all-optical switching of magnetization in GdFeCo microstructures by interference-enhanced absorption of light

Cited by 54 publications

References 21 publications

Nanoscale sub-100 picosecond all-optical magnetization switching in GdFeCo microstructures

Nanoscale sub-100 picosecond all-optical magnetization switching in GdFeCo microstructures

Ultrafast time-resolved magneto-optical imaging of all-optical switching in GdFeCo with femtosecond time-resolution and a μm spatial-resolution

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

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