5 research outputs found
Deflection of (anti)ferromagnetic skyrmions at heterochiral interfaces
Devising magnetic nanostructures with spatially heterogeneous
Dzyaloshinskii-Moriya interaction (DMI) is a promising pathway towards advanced
confinement and control of magnetic skyrmions in potential devices. Here we
discuss theoretically how a skyrmion interacts with a heterochiral interface
using micromagnetic simulations and analytic arguments. We show that a
heterochiral interface deflects the trajectory of ferromagnetic (FM) skyrmions,
and that the extent of such deflection is tuned by the applied spin-polarized
current and the difference in DMI across the interface. Further, we show that
this deflection is characteristic for the FM skyrmion, and is completely absent
in the antiferromagnetic (AFM) case. In turn, we reveal that the AFM skyrmion
achieves much higher velocities than its FM counterpart, yet experiences far
stronger confinement in nanoengineered heterochiral tracks, which reinforces
AFM skyrmions as a favorable choice for skyrmion-based devices
Manipulation of Magnetic Skyrmions by Superconducting Vortices in Ferromagnet-Superconductor Heterostructures
Dynamics of magnetic skyrmions in hybrid ferromagnetic films harbors novel
physical phenomena and holds promise for technological applications. In this
work, we discuss the behavior of magnetic skyrmions when coupled to
superconducting vortices in a ferromagnet-superconductor heterostructure. We
use numerical simulations and analytic arguments to reveal broader
possibilities for manipulating the skyrmion-vortex dynamic correlations in the
hybrid system, that are not possible in its separated constituents. We explore
the thresholds of particular dynamic phases, and quantify the phase diagram as
a function of the relevant material parameters, applied current and induced
magnetic torques. Finally, we demonstrate the broad and precise tunability of
the skyrmion Hall-angle in presence of vortices, with respect to currents
applied to either or both the superconductor and the ferromagnet within the
heterostructure
Spin textures in chiral magnetic monolayers with suppressed nearest-neighbor exchange
High tunability of two dimensional magnetic materials (by strain, gating,
heterostructuring or otherwise) provides unique conditions for studying
versatile magnetic properties and controlling emergent magnetic phases.
Expanding the scope of achievable magnetic phenomena in such materials is
important for both fundamental and technological advances. Here we perform
atomistic spin-dynamics simulations to explore the (chiral) magnetic phases of
atomic monolayers in the limit of suppressed first-neighbors exchange
interaction. We report the rich phase diagram of exotic magnetic
configurations, obtained for both square and honeycomb lattice symmetries,
comprising coexistence of ferromagnetic and antiferromagnetic spin-cycloids, as
well as multiple types of magnetic skyrmions. We perform a minimum-energy path
analysis for the skyrmion collapse to evaluate the stability of such
topological objects, and reveal that magnetic monolayers could be good
candidates to host the antiferromagnetic skyrmions that are experimentally
evasive to date