93 research outputs found
Potential implementation of Reservoir Computing models based on magnetic skyrmions
Reservoir Computing is a type of recursive neural network commonly used for
recognizing and predicting spatio-temporal events relying on a complex
hierarchy of nested feedback loops to generate a memory functionality. The
Reservoir Computing paradigm does not require any knowledge of the reservoir
topology or node weights for training purposes and can therefore utilize
naturally existing networks formed by a wide variety of physical processes.
Most efforts prior to this have focused on utilizing memristor techniques to
implement recursive neural networks. This paper examines the potential of
skyrmion fabrics formed in magnets with broken inversion symmetry that may
provide an attractive physical instantiation for Reservoir Computing.Comment: 11 pages, 3 figure
Twists in Ferromagnetic Monolayers With Trigonal Prismatic Symmetry
Two-dimensional materials such as graphene or hexagonal boron nitride are
indispensable in industry. The recently discovered 2D ferromagnetic materials
also promise to be vital for applications. In this work, we develop a
phenomenological description of non-centrosymmetric 2D ferromagnets with
trigonal prismatic crystal structure. We chose to study this special symmetry
group since these materials do break inversion symmetry and therefore, in
principle, allow for chiral spin structures such as magnetic helices and
skyrmions. However, unlike all non-centrosymmetric magnets known so far, we
show that the symmetry of magnetic trigonal prismatic monolayers neither allow
for an internal relativistic Dzyaloshinskii-Moriya interaction (DMI) nor a
reactive spin-orbit torque. We demonstrate that the DMI only becomes important
at the boundaries, where it modifies the boundary conditions of the
magnetization and leads to a helical equilibrium state with a helical
wavevector that is inherently linked to the internal spin orientation.
Furthermore, we find that the helical wavevector can be electrically
manipulated via dissipative spin-torque mechanisms. Our results reveal that 2D
magnets offer a large potential for unexplored magnetic effects.Comment: 5 pages, 3 figure
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