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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Updated: Aug 23, 2025

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Delicate Ferromagnetism in MnBi6Te10.

Chenhui Yan1, Yanglin Zhu2, Leixin Miao3

  • 1Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois60637, United States.

Nano Letters
|October 31, 2022
PubMed
Summary

Defects in MnBi6Te10 create tunable magnetic orders, crucial for topological quantum phenomena. This discovery offers a path for defect-engineering novel topological quantum phases.

Keywords:
MnBi6Te10antiferromagnetismdefectsferromagnetismmagnetic topological insulator

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Tailoring magnetic orders in topological insulators is key for topological quantum phenomena.
  • A major challenge is finding materials with defect-tunable magnetism and nontrivial topology.

Purpose of the Study:

  • To investigate disorder-enabled, tunable magnetic ground states in MnBi6Te10.
  • To understand the role of atomic defects in magnetic and topological properties.

Main Methods:

  • Magnetization measurements
  • Angle-resolved photoemission spectroscopy (ARPES)
  • Transmission electron microscopy (TEM)

Main Results:

  • Disorder-tuned magnetic ground states were observed in MnBi6Te10.
  • A 15 meV energy gap at the Dirac point was found in the ferromagnetic phase.
  • Antiferromagnetic MnBi6Te10 showed gapless topological surface states.
  • Significant Mn vacancies and migration were detected in the ferromagnetic phase.

Conclusions:

  • Atomic defects, specifically Mn vacancies and migration, enable tunable magnetic topological orders.
  • A conceptual framework explains how defects cooperatively alter magnetic ground state energies.
  • This research provides a route for nanoscale defect-engineering of topological quantum phases.