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Dual nature of improper ferroelectricity in a magnetoelectric multiferroic (Articolo in rivista)

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Dual nature of improper ferroelectricity in a magnetoelectric multiferroic (Articolo in rivista) (literal)

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Picozzi, S; Yamauchi, K; Sanyal, B; Sergienko, IA; Dagotto, E (2007)
Dual nature of improper ferroelectricity in a magnetoelectric multiferroic
in Physical review letters (Print)
(literal)

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INFM, CNR, CASTI Reg Lab, I-67010 Laquila, Italy; Uppsala Univ, Dept Phys, Theoret Magnetism Grp, SE-75121 Uppsala, Sweden; Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA; Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA (literal)

Titolo

Dual nature of improper ferroelectricity in a magnetoelectric multiferroic (literal)

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 degrees coherent rotation of Mn spins is also proposed. (literal)

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