Tohoku-Lorraine Collaboration : Review paper on Spin-Transport Mediated Single-Shot AOS

Ultrafast control of thin film nanomagnets using femtosecond laser pulses has attracted considerable attention for future ultrafast and energy-efficient photo-spintronics storage=memory devices. Single femtosecond laser pulse magnetization switching without an applied external magnetic field has been recently observed on various metallic thin films. Herein, a recent understanding of the physical Read more…

New Nano Letter “Ab Initio Study of Helicity-Dependent Light-Induced Demagnetization: From the Optical Regime to the Extreme Ultraviolet Regime”

In collaboration with the “Laboratoire de physique et chimie théoriques” and the Max Born Institute, we theoretically investigated the effect of optical and extreme ultraviolet (XUV) circularly polarized femtosecond pulses on the magnetization dynamics of ferromagnetic materials. Relying on real-time time-dependent density functional theory, we demonstrated that the light induces Read more…

New Nano Letter “Engineering Single-Shot All-Optical Switching of Ferromagnetic Materials”

Thanks to the strong collaboration between Tohoku University,  we investigated single-shot all-optical magnetization switching in a GdFeCo/Cu/[CoxNi1–x/Pt] spin-valve structure. We demonstrated that the threshold fluence for switching both the GdFeCo and the ferromagnetic layer depends on the laser pulse duration and the thickness and the Curie temperature of the ferromagnetic Read more…

Paper in Advanced Science

In GdFeCo/Cu/CoPt spin valve, the ultrafast demagnetization of the ferrimagnetic GdFeCo alloy, generated by a single femtosecond laser pulse, is shown to generate enough spin current to switch the magnetization of the ferromagnetic CoPt multilayer. By increasing the Gd concentration, the CoPt switching is found to be more energy efficient. http://dx.doi.org/10.1002/advs.202001996 This work Read more…