Magnetic anisotropy-controlled vortex nano-oscillator for neuromorphic computing

Abstract

Chiral magnetic vortex has shown great potential for high-density magnetic storage, modern telecommunication and computation devices, thanks to its topological stability and rich dynamic behaviours. Particularly, the synchronization of magnetic vortex nano-oscillators leads to the emergence of fascinating collective phenomena used for microwave generator and neuromorphic computing. In this work, by means of micromagnetic simulations, we create stable chiral magnetic vortices by exploiting the chiral coupling principle and study the gyrotropic motion of the vortex core under spin-transfer torques. The gyrotropic oscillation frequency can be tuned by injecting spin-polarised current as well as the change of the magnetic anisotropy in the vortex area, resulting from the modification of the vortex confine potential and the size of the vortex core. Two vortex nano-oscillators can be synchronized wherein the synchronization state can be modulated by the spin-polarised current and the magnetic anisotropy. Moreover, we demonstrate that the magnetic anisotropy can modify the synchronization patterns when integrating six vortices into an oscillator network, making it potentially serve as an oscillator-based neural network. Our work provides a new route to constructing a flexible oscillator network for neuromorphic computing hardware.

Periodic motion of macro- and/or micro-scale cantilevered fluid-conveying pipes with O(2) symmetry: a finite dimensional analysis

“…Due to the recent technological development in engineering practice, the characteristic size of structures become smaller and smaller [33][34][35][36], including the micro beam [37][38][39] with Winkler elastic foundation [40], micro torus plate [41], micro cylindrical shell [42,43], micro-structure on elastic foundation [44], and fluidconveying micro pipe [45]. The study of micro-scale pipes is an important research direction of the dynamics of fluid-conveying pipes.…”

Spectrum of Gyrotropic Modes and Energy Transfer between Dipolar‐Coupled Magnetic Vortices in a Square Lattice via Triggered Vortex Gyration: A Promise for Spintronics Technology

“…[1][2][3] The study of the manipulation of gyrotropic frequencies and their propagation characteristics is of great interest in spintronics for the design and manufacturing of GHzfrequency on-chip logic devices. [4] Their robust, novel, and unique properties help the scientific world implement new ideas in existing and future electronic devices. [5] Attention has been drawn to collective spin excitations, particularly in nanoscale magnetic elements, to understand the fundamental gyrotropic modes in confined geometries as well as to explore the potential for information processing devices.…”