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

Author:

Bhattacharjee Payal1ORCID,Barman Anjan2ORCID,Barman Saswati13ORCID

Affiliation:

1. Department of Basic Science and Humanities Institute of Engineering & Management Salt Lake Electronics Complex, Sector V, Salt Lake Kolkata 700091 India

2. Department of Condensed Matter and Materials Physics S. N. Bose National Centre for Basic Sciences Block JD, Sector III, Salt Lake Kolkata 700106 India

3. University of Engineering & Management University Area, Plot No. III, B/5, New Town Road, Action Area III, Newtown Kolkata 700160 India

Abstract

AbstractThe atoms in a crystal lattice vibrate together and generate vibrational modes known as acoustic and optical phonon modes. Similarly, collective vortex gyration motion can be generated in artificial magnetic vortex lattices, created from periodically arranged nanodisks of specific dimensions and aspect ratios. This study uses micromagnetic simulations to characterize the spectra of gyrotropic modes in two‐dimensional magnetic vortex‐based, tailor‐made square lattice arrangements. The shifting of mode frequencies and mode splitting is witnessed depending on the vortex configurations in the lattice. The obtained gyrotropic modes are analogous to two‐dimensional square lattice structures exhibiting acoustic and optical phonon modes. The dynamics of magnetic vortices are also discussed in the transfer of magnetic energy at three points along the three high symmetry directions of the lattice when the central magnetic vortex is excited by a spin‐polarized current with an excitation frequency equal to the collective gyrotropic frequencies of the vortices. Similar to the higher contribution of acoustic phonon modes in the heat transmission process in a crystal lattice, acoustic‐like gyrotropic modes transfer more energy than optical‐like gyration modes in the vortex lattices. These magnetic metastructures hold promise for novel applications in magnetic waveguides and information processing devices, as well as for advancing spintronics.

Funder

Science and Engineering Research Board

Department of Science and Technology, Government of Kerala

Publisher

Wiley

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