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Title: Dual Nature of Improper Ferroelectricity in a Magnetoelectric Multiferroic

Abstract

Using first-principles calculations, we study the microscopic origin of ferroelectricity (FE) induced by magnetic order in the orthorhombic HoMnO3. We obtain the largest ferroelectric polarization observed in the whole class of improper magnetic ferroelectrics to date. We find that the two proposed mechanisms for FE in multiferroics, lattice and electronic based, are simultaneously active in this compound: a large portion of the ferroelectric polarization arises due to quantum-mechanical effects of electron orbital polarization, in addition to the conventional polar atomic displacements. An interesting mechanism for switching the magnetoelectric domains by an electric field via a 180 coherent rotation of Mn spins is also proposed.

Authors:
 [1];  [1];  [2];  [3];  [3]
  1. CNR-INFM, L-Aquila, Italy
  2. Uppsala University, Uppsala, Sweden
  3. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
961780
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 99
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMIC DISPLACEMENTS; ELECTRIC FIELDS; ELECTRONS; FERROELECTRIC MATERIALS; POLARIZATION; ROTATION; SPIN

Citation Formats

Picozzi, S., Yamauchi, K., Sanyal, B., Sergienko, Ivan A, and Dagotto, Elbio R. Dual Nature of Improper Ferroelectricity in a Magnetoelectric Multiferroic. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.99.227201.
Picozzi, S., Yamauchi, K., Sanyal, B., Sergienko, Ivan A, & Dagotto, Elbio R. Dual Nature of Improper Ferroelectricity in a Magnetoelectric Multiferroic. United States. doi:10.1103/PhysRevLett.99.227201.
Picozzi, S., Yamauchi, K., Sanyal, B., Sergienko, Ivan A, and Dagotto, Elbio R. Mon . "Dual Nature of Improper Ferroelectricity in a Magnetoelectric Multiferroic". United States. doi:10.1103/PhysRevLett.99.227201.
@article{osti_961780,
title = {Dual Nature of Improper Ferroelectricity in a Magnetoelectric Multiferroic},
author = {Picozzi, S. and Yamauchi, K. and Sanyal, B. and Sergienko, Ivan A and Dagotto, Elbio R},
abstractNote = {Using first-principles calculations, we study the microscopic origin of ferroelectricity (FE) induced by magnetic order in the orthorhombic HoMnO3. We obtain the largest ferroelectric polarization observed in the whole class of improper magnetic ferroelectrics to date. We find that the two proposed mechanisms for FE in multiferroics, lattice and electronic based, are simultaneously active in this compound: a large portion of the ferroelectric polarization arises due to quantum-mechanical effects of electron orbital polarization, in addition to the conventional polar atomic displacements. An interesting mechanism for switching the magnetoelectric domains by an electric field via a 180 coherent rotation of Mn spins is also proposed.},
doi = {10.1103/PhysRevLett.99.227201},
journal = {Physical Review Letters},
number = ,
volume = 99,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}