11 research outputs found
Topological Hall signatures of magnetic hopfions
Magnetic hopfions are topologically protected three-dimensional solitons that
are constituted by a tube which exhibits a topologically nontrivial spin
texture in the cross-section profile and is closed to a torus. Here we show
that the hopfion's locally uncompensated emergent field leads to a topological
Hall signature, although the topological Hall effect vanishes on the global
level. The topological Hall signature is switchable by magnetic fields or
electric currents and occurs independently of the anomalous and conventional
Hall effects. It can therefore be exploited to electrically detect hopfions in
experiments and even to distinguish them from other textures like skyrmion
tubes. Furthermore, it can potentially be utilized in spintronic devices.
Exemplarily, we propose a hopfion-based racetrack data storage device and
simulate the electrical detection of the hopfions as carriers of information.Comment: 6 pages, 4 figure
Pseudo Electric Field and Pumping Valley Current in Graphene Nano-bubbles
The extremely high pseudo-magnetic field emerging in strained graphene
suggests that an oscillating nano-deformation will induce a very high current
even without electric bias. In this paper, we demonstrate the sub-terahertz
(THz) dynamics of a valley-current and the corresponding charge pumping with a
periodically excited nano-bubble. We discuss the amplitude of the
pseudo-electric field and investigate the dependence of the pumped valley
current on the different parameters of the system. Finally, we report the
signature of extra-harmonics generation in the valley current that might lead
to potential modern devices development operating in the nonlinear regimeComment: 7 page
Thermal Spin Torque in Double-Barrier Tunnel Junctions with Magnetic Insulators
International audienc
Role of spin diffusion in current-induced domain wall motion for disordered ferromagnets
Role of spin diffusion in current-induced domain wall motion for disordered ferromagnets
Pseudo electric field and pumping valley current in graphene nanobubbles
International audienceThe extremely high pseudo-magnetic field emerging in strained graphene suggests that an oscillating nano-deformation will induce a very high current even without electric bias. In this paper, we demonstrate the sub-terahertz (THz) dynamics of a valley-current and the corresponding charge pumping with a periodically excited nano-bubble. We discuss the amplitude of the pseudo-electric field and investigate the dependence of the pumped valley current on the different parameters of the system. Finally, we report the signature of extraharmonics generation in the valley current that might lead to potential modern devices development operating in the nonlinear regime