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Dual nature of improper ferroelectricity in a magnetoelectric multiferroic
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Theoretical Magnetism.
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, no 22, 227201- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2007. Vol. 99, no 22, 227201- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-113453DOI: 10.1103/PhysRevLett.99.227201ISI: 000251327500055OAI: oai:DiVA.org:uu-113453DiVA: diva2:290895
Available from: 2010-01-28 Created: 2010-01-28 Last updated: 2017-12-12

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Sanyal, Biplab

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