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Emergent Topological Hall Effect at a Charge-Transfer Interface.

Zhi Shiuh Lim1,2, Changjian Li1,3, Zhen Huang1,2

  • 1NUSNNI-NanoCore, National University of Singapore, Singapore, 117411, Singapore.

Small (Weinheim an Der Bergstrasse, Germany)
|November 16, 2020
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Summary
This summary is machine-generated.

Researchers explored magnetic Skyrmion-like bubbles in a CaMnO3/CaIrO3/CaMnO3 trilayer, observing their transformation and identifying optimal conditions for their emergence. This work offers a strategy for integrating Skyrmions with antiferromagnetic spintronics.

Keywords:
CaIrO3Skyrmion-like bubblescharge transferspin-orbit couplingtopological Hall effect

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Interface magnetism is crucial for spintronic memory development.
  • Charge transfer and spin-orbit coupling drive exotic magnetic phenomena.
  • Magnetic Skyrmions offer potential for high-density data storage.

Purpose of the Study:

  • Investigate the emergence and tunability of the topological Hall effect (THE) in a CaMnO3/CaIrO3/CaMnO3 trilayer.
  • Identify the origins of Dzyaloshinskii-Moriya interaction (DMI) and its interplay with antiferromagnetic superexchange.
  • Explore the potential for integrating Skyrmions with antiferromagnetic spintronics.

Main Methods:

  • Fabrication and characterization of CaMnO3/CaIrO3/CaMnO3 trilayer structures.
  • Magnetic field-dependent Hall effect measurements to study domain transformations.
  • Micromagnetic simulations to validate experimental observations.
  • High-resolution transmission electron microscopy (HRTEM) to analyze interface structure.
  • Spin-transfer torque experiments to assess bubble dynamics.

Main Results:

  • Observation of topological Hall effect (THE) indicative of magnetic Skyrmion-like bubbles.
  • Demonstration of Skyrmion-to-stripe domain transformation by tilting the magnetic field.
  • Identification of optimal CaMnO3 thicknesses for THE signal.
  • Discovery of stacking faults at the interface influencing DMI.
  • Determination of a low threshold current density for bubble motion.

Conclusions:

  • The CaMnO3/CaIrO3/CaMnO3 trilayer hosts tunable magnetic Skyrmion-like bubbles.
  • Interface engineering, including stacking faults, plays a key role in DMI and Skyrmion stability.
  • The findings provide a pathway for utilizing Skyrmions in antiferromagnetic spintronic devices.