Magnetoelectric effect in multiferroic nickelate perovskite YNiO₃

Area of Science:

• Condensed Matter Physics
• Materials Science
• Magnetism and Ferroelectricity

Background:

• The coupling between magnetic order and spontaneous electric polarization is crucial for controlling electronic properties and magnetism.
• Materials exhibiting both magnetic order and electric polarization are of significant interest for validating theoretical models.
• The RNiO3 family, including Yttrium Nickelate (YNiO3), are candidates for combining metal-insulator transitions (MIT) with magnetic and electric order.

Purpose of the Study:

• To investigate the predicted electric polarization in YNiO3, a material known for its metal-insulator transition and antiferromagnetic ground state.
• To experimentally confirm the magnetoelectric nature of charge-ordered RNiO3 compounds.
• To explore the relationship between magnetic structure, charge localization, and electric field effects in YNiO3.

Main Methods:

• Utilized resonant magnetic x-ray scattering with circular polarization to probe the magnetic structure of YNiO3.
• Applied an external electric field to observe its influence on the material's magnetic and electronic properties.
• Analyzed the magnetic structure for domains of spin-rotations indicative of electric polarization.

Main Results:

• Demonstrated that YNiO3 possesses a magnetic structure with spin-rotation domains consistent with electric polarization.
• Observed a reversal of the magnetic structure upon application of an electric field.
• Confirmed the coexistence of charge order, metal-insulator transition, and magnetoelectric coupling in YNiO3.

Conclusions:

• Yttrium Nickelate (YNiO3) exhibits type II multiferroic behavior, characterized by a magnetoelectric coupling.
• The study confirms the link between magnetic order, charge localization, and the metal-insulator transition in RNiO3 materials.
• The findings validate YNiO3 as a promising material for exploring fundamental physics and potential device applications based on magnetoelectric coupling.