4.6 Article

Domain-wall motion driven by a rotating field in a ferrimagnet

Journal

PHYSICAL REVIEW B
Volume 104, Issue 18, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.184431

Keywords

-

Funding

  1. Brain Pool Plus Program through the National Research Foundation of Korea - Ministry of Science and ICT [NRF-2020H1D3A2A03099291]
  2. National Research Foundation of Korea - Korea Government via the SRC Center for Quantum Coherence in Condensed Matter [NRF-2016R1A5A1008184]
  3. National Research Foundation of Korea [NRF-2015M3D1A1070465]
  4. POSCO Science Fellowship of POSCO TJ Park Foundation
  5. Korea Institute of Science and Technology (KIST) institutional program [2E31032]
  6. Na-tional Research Council of Science AMP
  7. Technology (NST) - Korea government (Ministry of Science and ICT) [2N45290]

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The study investigates the dynamics of a ferrimagnetic domain wall driven by a rotating magnetic field. It identified two regimes based on the frequency of the field, phase-locking and phase-unlocking, which demonstrate different behaviors in domain-wall motion. The work also highlights the significance of studying magnetic solitons under time-varying biases as a platform for exploring critical phenomena.
We theoretically study a ferrimagnetic domain-wall motion driven by a rotating magnetic field. We find that, depending on the magnitude and the frequency of the rotating field, the dynamics of a ferrimagnetic domain wall can be classified into two regimes. First, when the frequency is lower than a certain critical frequency set by the field magnitude, there is a stationary solution for the domain-wall dynamics, where a domain-wall in-plane magnetization rotates in-phase with the external field. The field-induced precession of the domain wall gives rise to the translational motion of the domain wall via the gyrotropic coupling between the domain-wall angle and position. In this so-called phase-locking regime, a domain-wall velocity increases as the frequency increases. Second, when the frequency exceeds the critical frequency, a domain-wall angle precession is not synchronous with the applied field. In this phase-unlocking regime, a domain-wall velocity decreases as the frequency increases. Moreover, the direction of the domain-wall motion is found to be reversed across the angular compensation point where the net spin density of the ferrimagnet changes its sign. Our work suggests that the dynamics of magnetic solitons under time-varying biases may serve as platform to study critical phenomena.

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