Electronic reconstruction and spontaneous magnetic reversal driven by interface dipole layer

ORAL

Abstract

Between two insulators, the electric dipole formed at the polar-nonpolar interface, triggers charge transfer that results in emergent phenomena. However, at metal-insulator junctions, a polar-nonpolar interface behaves very differently. We show that in this case, itinerant electronic screening becomes indispensable. The caveat to this premise is that, within the Thomas-Fermi screening length, the charge transfer is non-negligible. To illustrate this effect, we performed a detailed study of La0.67Sr0.33MnO3/SrTiO3 (001). Electronic reconstruction and subtle lattice distortion at the interface creates a strong antiferromagnetic (AFM) exchange coupling, producing an exchange-spring type interaction. Surprisingly, the AFM coupled layers at the interface prompt a spontaneous magnetic reversal and an inverted hysteresis persisting above room temperature. Our results demonstrate that an interface dipole leads to magnetic switching in a monolithic thin film, showing a new design pathway that activates the interface, on the length scale of Thomas-Fermi screening, a single unit cell.

–

Presenters

  • Mohammad Saghayezhian

    Louisiana State Univ - Baton Rouge, Department of Physics, Louisiana State University, Department of Physics & Astronomy, Louisiana State University, Physics and Astronomy, Louisiana State University

Authors

  • Mohammad Saghayezhian

    Louisiana State Univ - Baton Rouge, Department of Physics, Louisiana State University, Department of Physics & Astronomy, Louisiana State University, Physics and Astronomy, Louisiana State University

  • Zhen Wang

    Department of Physcis and Astronomy, Louisiana State University, Louisiana State University, Louisiana State Univ - Baton Rouge, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Department of Physics and Astronomy, Louisiana State University

  • Hangwen Guo

    Louisiana State Univ - Baton Rouge, Department of Physics, Louisiana State University, Dept. of Physics and Astronomy , Louisiana State University, USA, Department of Physics & Astronomy, Louisiana State University, Louisiana State University, Department of Physics and Astronomy, Louisiana State University

  • Rongying Jin

    Department of Physics and Astronomy, Louisiana State University, Physics and Astronomy, Louisiana State Univ - Baton Rouge, Department of Physcis and Astronomy, Louisiana State University, Department of Physics & astronomy, Louisiana state University, Department of Physics, Louisiana State University, Louisiana State Univ - Baton Rouge, Physics and Astronomy, Louisiana State University, Physics, Louisiana State Univ, Department of Physics and Astronomy,, Louisiana State Univ - Baton Rouge

  • Yimei Zhu

    Condensed Matter Physcis and Materials Science Departement, Brookhaven National Laboratory, Brookhaven National Laboratory, Condensed Matter Physics & Materials Science, Brookhaven National Laboratory, Brookhaven Natl Lab, Brookhaven National Lab, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory

  • Jiandi Zhang

    Department of Physcis and Astronomy, Louisiana State University, Louisiana State Univ - Baton Rouge, Department of Physics, Louisiana State University, Physics and Astronomy, Louisiana State University, Department of Physics and Astronomy, Louisiana State University

  • E Plummer

    Physics and Astronomy, Louisiana State Univ - Baton Rouge, Department of Physcis and Astronomy, Louisiana State University, Louisiana State Univ - Baton Rouge, Department of Physics, Louisiana State University, Dept. of Physics and Astronomy , Louisiana State University, USA, Department of Physics & Astronomy, Louisiana State University, Department of Physics and Astronomy, Louisiana State University