Energy storage in magnetic textures driven by vorticity flow

Abstract

An experimentally feasible energy-storage concept is formulated based on vorticity (hydro)dynamics within an easy-plane insulating magnet. The free energy, associated with the magnetic winding texture, is built up in a circular easy-plane magnetic structure by injecting a vorticity flow in the radial direction. The latter is accomplished by electrically induced spin-transfer torque, which pumps energy into the magnetic system in proportion to the vortex flux. The resultant magnetic metastable state with a finite winding number can be maintained for a long time because the process of its relaxation via phase slips is exponentially suppressed when the temperature is well below the Curie temperature. We propose to characterize the vorticity-current interaction underlying the energy-loading mechanism through its contribution to the effective electric inductance in the rf response. Our proposal may open an avenue for naturally powering spintronic circuits and nontraditional magnet-based neuromorphic networks.

Zeeman term for the Néel vector in a two sublattice antiferromagnet using Dzyaloshinsky-Moriya interaction and magnetic field

“…We remark that, in the easy axis case, the soliton profile is no longer stable when K → 0 as the applied magnetic field increases; the system undergoes a spin-flop transition into a spin-flop phase, where the Néel vector lies within the plane perpendicular to the magnetic field. In the easy plane case, one can utilize the magnetic field to enhance the easy-plane anisotropy, which is essential for the conservation of spin winding and thus is applicable in energy storages [30,31] and related transport experiments [32][33][34].…”

Magneto-ionic suppression of magnetic vortices

“…Nonetheless, the applications of magnetic vortices extend far beyond memory applications, and also include oscillators for effective microwave generation, [6] energy storage, [7] or biomedical applications (theragnostics) where the magnetic vortices are capable of damaging the membrane of cancer cells or promote drug delivery. [8,9] In turn, single-domain magnetic nanoparticles have found applications in e.g.…”

Nematronics: Reciprocal coupling between ionic currents and nematic dynamics

“…The reciprocal coupling between magnetic and electric degrees of freedom is the hallmark of spintronics [1,2]. There have been myriad proposals to exploit electron mediated spin torque and spin pumping for novel devices and applications [3], such as creating energy storage devices [4,5], spin-based memory [6][7][8][9], and methods for long-range signal transport [1,10,11]. For soft condensed matter and biological systems, we can extend the spintronics approach of studying effective torques and motive forces to nematic electrolytes (i.e.…”