1.2k citations · 2.5k across the 24 of their papers we have counts for
24 papers
Reversal of the skyrmion topological deflection across ferrimagnetic angular momentum compensation
L. Berges, R. Weil, A. Mougin +1
Due to their non-trivial topology, skyrmions describe deflected trajectories, which hinders their straight propagation in nanotracks and can lead to their annihilation at the track…
Skyrmion inertia in synthetic antiferromagnets
Sujit Panigrahy, Sougata Mallick, Joao Sampaio +1
We describe the dynamics of magnetic skyrmions in synthetic antiferromagnets (SAF), with a finite interlayer coupling. Due to the opposite gyrovector of the skyrmions in the two SA…
Evidence of Strong Dzyaloshinskii-Moriya Interaction at the Cobalt/Hexagonal Boron Nitride Interface
Banan El-Kerdi, André Thiaville, Stanislas Rohart +4
The Dzyaloshinskii-Moriya interaction (DMI) and perpendicular magnetic anisotropy (PMA) were measured on four series of Co films (1-2.2 nm thick) grown on Pt or Au and covered with…
Size-dependent mobility of skyrmions beyond pinning in ferrimagnetic GdCo thin films
Léo Berges, Eloi Haltz, Sujit Panigrahy +5
Magnetic skyrmions are swirling magnetic textures that can be efficiently driven with spin-orbit torques with a deflected trajectory. However, pinning slows skyrmions down and alte…
Domain wall dynamics in antiferromagnetically-coupled double-lattice systems
Eloi Haltz, Sachin Krishnia, Léo Berges +2
In ferromagnetic materials, the rich dynamics of magnetic domain walls (DWs) under magnetic field or current have been successfully described using the well-known q-ϕ analytical mo…
Domain wall propagation by spin-orbit torques in in-plane magnetized systems
Ryuhei Kohno, João Sampaio, Stanislas Rohart +1
The effect of damping-like spin-orbit torque (DL SOT) on magnetic domain walls (DWs) in in-plane magnetised soft tracks is studied analytically and with micromagnetic simulations.…
Spin-orbit coupling in single layer ferrimagnets: direct observation of spin-orbit torques and chiral spin textures
Sachin Krishnia, Eloi Haltz, Léo Berges +7
We demonstrate that effects of spin-orbit coupling and inversion asymmetry exist in a single GdFeCo ferrimagnetic layer, even without a heavy metal interface. We use electric trans…
Role of interfaces in the biased composition of TbFe(Co) thin films
E. Haltz, R. Weil, J. Sampaio +9
Ferrimagnetic TbFe or TbFeCo amorphous alloy thin films have been grown by co-evaporation in ultra-high vacuum. They exhibit an out-of-plane magnetic anisotropy up to their Curie t…
Velocity enhancement by synchronization of magnetic domain walls
Aleš Hrabec, Viola Křižáková, Stefania Pizzini +4
Magnetic domain walls are objects whose dynamics is inseparably connected to their structure. In this work we investigate magnetic bilayers, which are engineered such that a couple…
Skyrmion morphology in ultrathin magnetic films
I. Gross, W. Akhtar, A. Hrabec +8
Nitrogen-vacancy magnetic microscopy is employed in quenching mode as a non-invasive, high resolution tool to investigate the morphology of isolated skyrmions in ultrathin magnetic…
Current-induced skyrmion generation and dynamics in symmetric bilayers
Ales Hrabec, Joao Sampaio, Mohamed Belmeguenai +7
Magnetic skyrmions are textures behaving as quasiparticles which are topologically different from other states. Their discovery in systems with broken inversion symmetry sparked th…
Inside the perpendicular spin-torque memristor
Steven Lequeux, Joao Sampaio, Vincent Cros +6
Memristors are non-volatile nano-resistors. Their resistance can be tuned by applied currents or voltages and set to a large number of levels between two limit values. Thanks to th…
Twist in the bias-dependence of spin-torques in magnetic tunnel junctions
Sören Boyn, João Sampaio, Vincent Cros +5
The spin-torque in magnetic tunnel junctions possesses two components that both depend on the applied voltage. Here, we develop a new method for the accurate extraction of this bia…
Very large domain wall velocities in Pt/Co/Gd trilayers with Dzyaloshinskii-Moriya interaction
Thai Ha Pham, J. Vogel, J. Sampaio +9
We carried out measurements of domain wall (DW) velocities driven by magnetic field pulses in symmetric Pt/Co/Pt and asymmetric Pt/Co/AlOx, Pt/Co/GdOx and Pt/Co/Gd trilayers with u…
A skyrmion-based spin-torque nano-oscillator
F. Garcia-Sanchez, J. Sampaio, N. Reyren +2
A model for a spin-torque nano-oscillator based on the self-sustained oscillation of a magnetic skyrmion is presented. The system involves a circular nanopillar geometry comprising…
Disruptive effect of Dzyaloshinskii-Moriya interaction on the MRAM cell performance
J. Sampaio, A. V. Khvalkovskiy, M. Kuteifan +5
In order to increase the thermal stability of a magnetic random access memory (MRAM) cell, materials with high spin-orbit interaction are often introduced in the storage layer. As…
Perpendicular magnetization reversal in Pt/[Co/Ni]/Al multilayers via the Spin Hall Effect of Pt
J. -C. Rojas-Sánchez, P. Laczkowski, J. Sampaio +6
We experimentally investigate the current-induced magnetization reversal in Pt/[Co/Ni]/Al multilayers combining the anomalous Hall effect and magneto-optical Kerr effect techni…
Increased magnetic damping of a single domain wall and adjacent magnetic domains detected by spin torque diode in a nanostripe
Steven Lequeux, Joao Sampaio, Paolo Bortolotti +11
We use spin-torque resonance to probe simultaneously and separately the dynamics of a magnetic domain wall and of magnetic domains in a nanostripe magnetic tunnel junction. Thanks…
A Dzyaloshinskii-Moriya Anisotropy in Nanomagnets with in-plane Magnetization
M. Cubukcu, J. Sampaio, K. Bouzehouane +4
We report on a new source of in-plane anisotropy in nanomagnets due to the presence of Dzyaloshinskii-Moriya interaction (DMI). This anisotropy depends on the shape of the magnet,…
Skyrmions at room temperature : From magnetic thin films to magnetic multilayers
C. Moreau-Luchaire, C. Moutafis, N. Reyren +12
Facing the ever-growing demand for data storage will most probably require a new paradigm. Magnetic skyrmions are anticipated to solve this issue as they are arguably the smallest…
Breathing modes of confined skyrmions in ultrathin magnetic dots
Joo-Von Kim, Felipe Garcia-Sanchez, Joao Sampaio +3
The dynamics of individual magnetic skyrmions confined in ultrathin film dots is studied theoretically. The systems considered are transition metal ferromagnets possessing perpendi…
Time-resolved observation of fast domain-walls driven by vertical spin currents in short tracks
Joao Sampaio, Steven Lequeux, Peter J. Metaxas +12
We present time-resolved measurements of the displacement of magnetic domain-walls (DWs) driven by vertical spin-polarized currents in track-shaped magnetic tunnel junctions. In th…
Domain walls in spin valve nanotracks: characterisation and applications
Joao Sampaio
Magnetic systems based on the manipulation of domain walls (DWs) in nano-tracks have been shown to store data at high density, perform complex logic operations, and mechanically ma…
Coupling and induced depinning of magnetic domain walls in adjacent spin valve nanotracks
J. Sampaio, L. O'Brien, D. Petit +6
The magnetostatic interaction between magnetic domain walls (DWs) in adjacent nanotracks has been shown to produce strong inter-DW coupling and mutual pinning. In this paper, we ha…