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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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Magnetic Susceptibility and Permeability01:31

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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.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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Spin-Splitting Magnetoresistance in Altermagnetic RuO2 Thin Films.

Hongyu Chen1, Zi-An Wang2,3, Peixin Qin1

  • 1School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.

Advanced Materials (Deerfield Beach, Fla.)
|June 10, 2025
PubMed
Summary

This study resolves the debate on RuO2 altermagnetism by demonstrating a spin-splitting magnetoresistance (SSMR) effect. This effect reveals the Néel vector orientation and confirms long-range magnetic order in RuO2 thin films.

Keywords:
RuO2altermagnetsspin‐splitting magnetoresistance

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Altermagnets exhibit unique correlations between magnetic exchange and crystal structure, offering spintronic potential.
  • The altermagnetism of Ruthenium Dioxide (RuO2) remains debated despite its early discovery.

Purpose of the Study:

  • To resolve the controversy surrounding RuO2 altermagnetism.
  • To demonstrate a novel spin-splitting magnetoresistance (SSMR) effect driven by nonrelativistic spin splitting.
  • To establish an electric method for probing the Néel vector in altermagnets.

Main Methods:

  • Investigated magnetoresistance in (101)-RuO2/Co bilayers.
  • Analyzed the spin-splitting magnetoresistance (SSMR) effect.
  • Characterized the angular and temperature dependence of the SSMR effect.

Main Results:

  • A sizable spin-splitting magnetoresistance (SSMR) effect was observed and disentangled.
  • The SSMR effect exhibited unusual angular dependence with a phase shift, linked to Néel vector orientation.
  • Pronounced temperature dependence of SSMR was observed, correlating with electron scattering.
  • A Néel vector orientation along the [001] direction in RuO2 was unveiled.

Conclusions:

  • The study demonstrates that spin-splitting magnetoresistance (SSMR) is a viable method for probing altermagnet Néel vectors.
  • Long-range magnetic order is confirmed in thin films of RuO2.
  • The findings contribute to understanding and utilizing altermagnetic materials in spintronics.