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Full Electroresistance Modulation in a Mixed-Phase Metallic Alloy.

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Researchers achieved a giant electroresistance effect in a metallic alloy above room temperature using an electric field. This was enabled by strain-mediated magnetoelectric coupling in iron-rhodium/barium titanate heterostructures, leading to a magnetic phase transition.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Iron-rhodium (FeRh) alloys exhibit a temperature-driven magnetic phase transition.
  • Magnetoelectric coupling offers a pathway to control magnetic properties with electric fields.

Purpose of the Study:

  • To investigate the electroresistance effect in FeRh/BaTiO3 heterostructures.
  • To demonstrate electric-field-induced magnetic phase transitions above room temperature.

Main Methods:

  • Epitaxial growth of FeRh/BaTiO3 heterostructures.
  • Application of electric fields to induce piezoelectric strain.
  • Measurement of electroresistance and magnetic properties.

Main Results:

  • A giant, approximately 22%, electroresistance modulation was observed above room temperature.
  • The effect was achieved using a low electric field (2 kV/cm) via strain-mediated magnetoelectric coupling.
  • An isothermal magnetic phase transition in FeRh thin films was driven by tetragonality modulation, distinct from temperature-driven transitions.

Conclusions:

  • FeRh/BaTiO3 heterostructures exhibit significant electric-field-controlled electroresistance.
  • This work provides evidence for strain-induced isothermal magnetic phase transitions in FeRh.
  • FeRh serves as a model system for studying phase instability in materials with colossal magnetoresistance properties.