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Related Concept Videos

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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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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Updated: Jan 17, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Evidence for single variant in altermagnetic RuO2(101) thin films.

Cong He1,2, Zhenchao Wen3, Jun Okabayashi4

  • 1National Institute for Materials Science (NIMS), Tsukuba, Japan.

Nature Communications
|September 24, 2025
PubMed
Summary
This summary is machine-generated.

Researchers successfully fabricated single-variant altermagnetic Ruthenium Dioxide (RuO2) thin films. This breakthrough in altermagnetism is crucial for developing advanced spintronic devices with enhanced spin transport properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnetism offers unique properties like strong spin-splitting and zero net magnetization for spintronic applications.
  • Fabricating single-variant altermagnetic thin films is essential for harnessing these properties but presents significant challenges.

Purpose of the Study:

  • To demonstrate the successful formation of single-variant altermagnetic Ruthenium Dioxide (RuO2) thin films.
  • To investigate the structural and magnetic properties of these films.
  • To explore the potential of these films in spintronic devices.

Main Methods:

  • Epitaxial growth of RuO2(101) thin films on Al2O3(1 1 ¯ 02) r-plane substrates.
  • Structural characterization using X-ray diffraction (XRD) and atomic-resolution transmission electron microscopy (TEM).
  • Magnetic analysis via X-ray magnetic linear dichroism (XMLD).
  • First-principles density functional theory (DFT) calculations.

Main Results:

  • Definitive evidence for the formation of single-variant epitaxial RuO2(101) thin films.
  • Identification of the crucial role of oxygen atom occupancy in achieving single-variant growth.
  • Observation of spin-splitting magnetoresistance in RuO2(101)/CoFeB bilayers, confirming the impact on spin transport.

Conclusions:

  • The successful fabrication of single-variant RuO2(101) thin films represents a significant advancement in altermagnetism.
  • This achievement provides a viable material platform for future spintronic device development.
  • The findings pave the way for exploring novel applications leveraging the unique properties of altermagnetic materials.