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Stable and manipulable Bloch point.

Marijan Beg1,2, Ryan A Pepper3, David Cortés-Ortuño3

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Researchers explored combining chiral materials to create stable magnetic Bloch points for spintronic devices. These particle-like states, crucial for data storage, can be manipulated with magnetic fields.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Materials with Dzyaloshinskii-Moriya interaction are researched for data storage and processing.
  • Current research focuses on magnetic systems with single chirality.
  • Combining materials with different chirality offers new avenues for spintronic devices.

Purpose of the Study:

  • To investigate the emergence and behavior of Bloch points in a two-layered FeGe disk with differing chiralities.
  • To explore the potential of these Bloch points for future spintronic applications.

Main Methods:

  • Finite element micromagnetic simulations were employed.
  • An FeGe disk with two layers of different chirality was studied.
  • The time evolution of the magnetization field was analyzed.

Main Results:

  • A stable Bloch point was observed to emerge at the interface between the two layers for specific thicknesses.
  • The system exhibited hysteretic behavior.
  • Two distinct Bloch point configurations ('head-to-head' and 'tail-to-tail') were identified and shown to be switchable via an external magnetic field.
  • The creation mechanism of the Bloch point was revealed.

Conclusions:

  • The study introduces a stable and manipulable Bloch point.
  • These Bloch points are promising candidates for particle-like states in future spintronic devices.
  • Combining materials with different chirality is a viable strategy for creating novel magnetic states.