2D materials and van der Waals (vdW) heterostructures are promising candidates to build efficient THz spintronic emitters. Here, we demonstrate the drastic modification of THz spintronic emission by inserting a single layer of MoSe2 in the PtSe2/graphene vdW heterostructure. Ab initio calculations indeed show the emergence of Rashba states due to the electronic hybridization between […]

Time-resolved magnetic helicoidal dichroism (MHD) was successfully used to assess the ultra-fast dynamics of magnetization. This first attempt to use an MHD-based technique was demonstrated on a magnetic vortex structure hosted by a permalloy pacman micropillar (diameter~15nm, thickness~80nm). Micromagnetic simulations allowed to link the features identified in the MHD signal to a process of regeneration […]

Superparamagnetic tunnel junctions have emerged as promising stochastic neurons for low-energy cognitive computing. We report, for the first time, nanosecond-scale mean waiting times between magnetization reversals in perpendicularly magnetized tunnel junctions, enabled by a strong entropic contribution to the thermally activated switching dynamics.   Magnetic tunnel junctions (MTJs) consist of a free and a fixed […]

The modulation of THz spintronic emitters represents a real challenge nowadays. Here, we consider a THz emitter made of 2D materials grown by molecular beam epitaxy (MBE) on large area and transferred on LiNbO3. The low dimensional character makes this system sensitive to the ferroelectric polarization of LiNbO3. Using this proximity effect, we demonstrate the […]

Topology is a powerful tool for categorizing magnetization textures by defining a topological index in both two-dimensional (2D) systems, such as thin films or curved surfaces, and in 3D bulk systems. In the emerging field of 3D nanomagnetism, both volume and surface topological numbers must be considered, requiring the identification of a proper global topological […]

The emergence of a large helical orbital texture due to the formation of the surface states at the metallic Co/Al interfaces originating from the orbital Edelstein effect and giving rise to a nonequilibrium orbital accumulation is revealed to produce large current-induced torques, providing an essential theoretical background for the experimental observations. Spin-orbit coupling is found […]

This work focuses on the study of the intrinsic cytotoxicity of magnetic particles, developed in our laboratory for the application of local forces at the cellular level. More precisely, we were interested in the effect of the rigidity of the cellular growth substrate on the response induced by the presence of particles.   The study […]

The extent to which an external magnetic field can influence the operation of Spin-Transfer-Torque Magnetic Random Access Memory (STT-MRAM) remains a critical question within the microelectronics industry in particular regarding its use in automotive industry. SPINTEC is actively engaged in an international technical group comprising academic and industrial experts in MRAM technology, with a particular […]

Two-dimensional (2D) materials like transition metal dichalcogenides (TMD) are considered as key candidates to replace silicon in several technologies with enhanced performances. In this work, we address the two remaining challenges to reach their industrial deployment: the wafer scale growth of TMDs and their integration into operational devices using CMOS compatible process. This is achieved […]

By performing transport simulations on carefully derived Wannier tight-binding models, Janus chromium-based transition-metal dichalcogenide (TMD) monolayers are found to exhibit a spin-orbit torque (SOT) performance comparable to the most efficient two-dimensional materials, while additionally allowing for field-free perpendicular magnetization switching, due to their reduced in-plane symmetry.   The spin–orbit torque (SOT) mechanism represents an innovative […]