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PGI Kolloquium:

Prof. Dr. Stéphane Mangin,
Institut Jean Lamour, CNRS/University of Lorraine, Nancy, France

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

03.05.2019 11:00 Uhr

All-Optical Magnetization Switching in Spin-Valve Structure mediated by Spin-Polarized Hot Electron Transport

All-optical ultrafast magnetization switching in magnetic material thin film without the assistance of an applied external magnetic field is being explored for future ultrafast and energy-efficient magnetic storage and memories. We have shown that femto-second light pulses induce magnetization reversal in a large variety of magnetic materials [1,2].

However, so far, only GdFeCo-based ferrimagnetic thin films exhibit magnetization switching via a single optical pulse. We also demonstrated that GdFeCo-based film could be switch not only with a single light pulse but also with a single hot electron pulse[3]. Recently single-pulse switching of Co/Pt multilayers within a magnetic spin-valve structure ([Co/Pt] / Cu / GdFeCo) was shown. The four possible magnetic configurations of the spin valve can be accessed using a sequence of single femto-second light pulses [4].

This experimental study reveals that the magnetization final state of the ferromagnetic [Co/Pt] layer is determined by spin-polarized hot electrons generated by the light pulse interactions with the GdFeCo layer. This work provides a new approach to deterministically switch ferromagnetic layers and a pathway to engineering materials for opto-magnetic multi-bit recording.

[1] Mangin, S. et al. Engineered materials for all-optical helicity-dependent magnetic switching. Nat. Mater. 13, 286 (2014)

[2] Lambert, C. -H. et al. All-optical control of ferromagnetic thin films and nanostructures. Science 345, 1337 (2014

[3] Xu, Yong et al. Ultrafast Magnetization Manupulation Using Single Femtosecond Light and Hot-Electron Pulses. Adv. Mater. 29, 1703474 (2017)

[4] S. Iihama et al Single-shot multi-level all-optical magnetization switching mediated by spin-polarized hot electron transport Adv Matter 1804004 (2018)


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