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Title: Magneto-electric coupling in antiferromagnet/ferroelectric Mn{sub 2}Au/BaTiO{sub 3} interface

Abstract

Within the crucial issue of the electric field control of magnetism, the use of antiferromagnets (AFMs) coupled to ferroelectrics is much less explored than the ferromagnets counterpart, although the first choice might lead to better performances and larger stability with respect to external perturbations (such as magnetic fields). Here, we explore the possibility to control the magnetic anisotropy of a Mn{sub 2}Au layer by reversing the ferroelectric polarization of BaTiO{sub 3} in Mn{sub 2}Au/BaTiO{sub 3} interfaces. By means of a thorough exploration of many possible geometry configurations, we identify the two most stable, corresponding to compressive and tensile strain at the interface. The first appears to be easy-axis, while the second—easy-plane—with a large induced moment on the interface Ti atom. The reversal of ferroelectric polarization changes the anisotropy by approximately 50%, thus paving the way to the control of AFM properties with an electric field.

Authors:
 [1];  [2];  [3]
  1. King's College London, Theory and Simulation of Condensed Matter (TSCM), The Strand, London WC2R 2LS (United Kingdom)
  2. Consiglio Nazionale delle Ricerche, Istituto SPIN, UOS CNR-SPIN L'Aquila, I-67100 L'Aquila (Italy)
  3. Consiglio Nazionale delle Ricerche, Istituto SPIN, UOS L'Aquila, Sede di lavoro CNR-SPIN c/o University “G. D'Annunzio,” 66100 Chieti (Italy)
Publication Date:
OSTI Identifier:
22598903
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 120; Journal Issue: 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; ANTIFERROMAGNETIC MATERIALS; APPROXIMATIONS; ATOMIC FORCE MICROSCOPY; CONTROL; COUPLING; DISTURBANCES; ELECTRIC FIELDS; EXPLORATION; FERROELECTRIC MATERIALS; GEOMETRY; INTERFACES; LAYERS; MAGNETIC FIELDS; MAGNETISM; PERFORMANCE; PERTURBATION THEORY; POLARIZATION; TITANATES

Citation Formats

Plekhanov, Evgeny, Stroppa, Alessandro, and Picozzi, Silvia. Magneto-electric coupling in antiferromagnet/ferroelectric Mn{sub 2}Au/BaTiO{sub 3} interface. United States: N. p., 2016. Web. doi:10.1063/1.4961213.
Plekhanov, Evgeny, Stroppa, Alessandro, & Picozzi, Silvia. Magneto-electric coupling in antiferromagnet/ferroelectric Mn{sub 2}Au/BaTiO{sub 3} interface. United States. doi:10.1063/1.4961213.
Plekhanov, Evgeny, Stroppa, Alessandro, and Picozzi, Silvia. Sun . "Magneto-electric coupling in antiferromagnet/ferroelectric Mn{sub 2}Au/BaTiO{sub 3} interface". United States. doi:10.1063/1.4961213.
@article{osti_22598903,
title = {Magneto-electric coupling in antiferromagnet/ferroelectric Mn{sub 2}Au/BaTiO{sub 3} interface},
author = {Plekhanov, Evgeny and Stroppa, Alessandro and Picozzi, Silvia},
abstractNote = {Within the crucial issue of the electric field control of magnetism, the use of antiferromagnets (AFMs) coupled to ferroelectrics is much less explored than the ferromagnets counterpart, although the first choice might lead to better performances and larger stability with respect to external perturbations (such as magnetic fields). Here, we explore the possibility to control the magnetic anisotropy of a Mn{sub 2}Au layer by reversing the ferroelectric polarization of BaTiO{sub 3} in Mn{sub 2}Au/BaTiO{sub 3} interfaces. By means of a thorough exploration of many possible geometry configurations, we identify the two most stable, corresponding to compressive and tensile strain at the interface. The first appears to be easy-axis, while the second—easy-plane—with a large induced moment on the interface Ti atom. The reversal of ferroelectric polarization changes the anisotropy by approximately 50%, thus paving the way to the control of AFM properties with an electric field.},
doi = {10.1063/1.4961213},
journal = {Journal of Applied Physics},
number = 7,
volume = 120,
place = {United States},
year = {Sun Aug 21 00:00:00 EDT 2016},
month = {Sun Aug 21 00:00:00 EDT 2016}
}
  • Magnetic, ferroelectric, and magneto-electric studies are reported on 0.9 BaTiO{sub 3}-0.1 Ni{sub x}Zn{sub 1-x}Fe{sub 2}O{sub 4} (x = 0 to 1.0 at 0.2). The bi-phase nature of the prepared composites is confirmed by the x-ray diffraction measurements. The simultaneous presence of room temperature ferroelectric and magnetic orderings is confirmed by measuring the room temperature P-E and M-H loops of the prepared composites. The magneto-electric behavior is found maximum for the composite consisting of Ni{sub 0.8}Zn{sub 0.2}Fe{sub 2}O{sub 4} as magnetic phase, which is explained on the basis of the magnetostrictive behavior of Ni{sub x}Zn{sub 1-x}Fe{sub 2}O{sub 4} phase.
  • The strong interaction at an interface between a substrate and thin film leads to epitaxy and provides a means of inducing structural changes in the epitaxial film. These induced material phases often exhibit technologically relevant electronic, magnetic, and functional properties. The 2×1 surface of a Ge(001) substrate applies a unique type of epitaxial constraint on thin films of the perovskite oxide BaTiO3 where a change in bonding and symmetry at the interface leads to a non-bulk-like crystal structure of the BaTiO3. While the complex crystal structure is predicted using first-principles theory, it is further shown that the details of themore » structure are a consequence of hidden phases found in the bulk elastic response of the BaTiO3 induced by the symmetry of forces exerted by the germanium substrate.« less
  • In this study, the strong interaction at an interface between a substrate and thin film leads to epitaxy and provides a means of inducing structural changes in the epitaxial film. These induced material phases often exhibit technologically relevant electronic, magnetic, and functional properties. The 2 x 1 surface of a Ge(001) substrate applies a unique type of epitaxial constraint on thin films of the perovskite oxide BaTiO 3 where a change in bonding and symmetry at the interface leads to a non-bulk-like crystal structure of the BaTiO 3. While the complex crystal structure is predicted using first-principles theory, it ismore » further shown that the details of the structure are a consequence of hidden phases found in the bulk elastic response of the BaTiO 3 induced by the symmetry of forces exerted by the germanium substrate.« less