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Spatial antiferromagnetic spin texture as a nano-oscillator.

Victor S Gerasimchuk1, Yuri I Gorobets1,2, Oksana Yu Gorobets1,2

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We theoretically studied self-oscillations in confined spin textures within antiferromagnets. This research interprets these spin textures as magnetic nano-oscillators, revealing their topological and inertial mass.

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Theoretical Physics

Background:

  • Topological spin textures like skyrmions and hopfions are crucial in spintronics.
  • Understanding their dynamics, especially self-oscillations, is key for novel device applications.
  • Antiferromagnets with perpendicular magnetic anisotropy offer unique properties for hosting these textures.

Purpose of the Study:

  • To theoretically investigate the self-oscillations of localized spatial magnetization configurations (skyrmion/hopfion type) in antiferromagnets.
  • To derive and solve the equations governing the free oscillations of these confined spin textures.
  • To characterize the oscillatory behavior and determine fundamental properties like mass and energy.

Main Methods:

  • Utilizing an energy approach to self-consistently account for the inhomogeneity of the topological spin texture.
  • Deriving the equation of free oscillations for the confined spin configuration magnetization.
  • Finding the quasi-classical solution to the derived oscillation equation.

Main Results:

  • The frequency, period, and relative amplitude of oscillations for a thin ring spin texture were determined.
  • For the first time, the topological mass, inertial mass, and total energy of the main oscillation tone were calculated.
  • The self-oscillatory process was successfully interpreted as a magnetic nano-oscillator.

Conclusions:

  • The study provides a theoretical framework for understanding self-oscillations in confined spin textures.
  • The findings establish a connection between topological spin textures and magnetic nano-oscillators.
  • This work lays the groundwork for potential applications in nanoscale magnetic devices.