Journal ArticleDOI
Crystal texture selection in epitaxies of orthorhombic antiferromagnetic YMnO3 films
Xavier Marti,Florencio Sánchez,Vassil Skumryev,Vladimir Laukhin,C. Ferrater,M.V. García-Cuenca,Maria Varela,Josep Fontcuberta +7 more
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TLDR
In this article, the orthorhombic phase of YMnO3 has been epitaxially stabilized on single crystal substrates and the out-of-plane orientation of the epitaxial films can be tuned to (001), (101), or (100).About:
This article is published in Thin Solid Films.The article was published on 2008-06-02. It has received 37 citations till now. The article focuses on the topics: Orthorhombic crystal system & Single crystal.read more
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Journal ArticleDOI
Non- d 0 Mn-driven ferroelectricity in antiferromagnetic BaMnO 3
TL;DR: In this article, first-principles density-functional theory was used to predict a ferroelectric ground state driven by the off-centering of the magnetic ion in perovskite-structure.
Journal Article
Non-$d^0$ Mn-driven ferroelectricity in antiferromagnetic BaMnO$_3$
Journal ArticleDOI
Nonferroelectric contributions to the hysteresis cycles in manganite thin films: A comparative study of measurement techniques
Ignasi Fina,Lourdes Fàbrega,Eric Langenberg,Xavi Marti,Florencio Sánchez,Manuel Varela,Josep Fontcuberta +6 more
TL;DR: Several experimental methods to measure ferroelectric hysteresis loops and to extract polarization values are compared for thin films with significant losses and different magnitudes of polarization in this paper, which allows the determination of the most appropriate frequency range and technique to extract reliable values of the remanent polarization in materials with low polarization and high leakage.
Journal ArticleDOI
Emergence of ferromagnetism in antiferromagnetic TbMnO3 by epitaxial strain
Xavier Marti,Vassil Skumryev,C. Ferrater,M.V. García-Cuenca,Maria Varela,Florencio Sánchez,Josep Fontcuberta +6 more
TL;DR: In this article, it was shown that in oxide thin films of spiral antiferromagnetic orthorhombic TbMnO3, ferromagnetism emerges resulting from epitaxially induced strain.
Journal ArticleDOI
Magnetic switch of polarization in epitaxial orthorhombic YMnO3 thin films
TL;DR: In this paper, the growth and characterization of epitaxial thin films of orthorhombic YMnO3 was studied and it was found that a ferroelectric polarization exists along c-axis (Pc∼90 nC/cm2) and a magnetic field induces the development of a ferroidelectric polarization along a-axis while suppressing Pc. This finding evidences that a noncollinear spin arrangement in thin films allows switchable electrical polarization.
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Journal ArticleDOI
Multiferroic and magnetoelectric materials
TL;DR: A ferroelectric crystal exhibits a stable and switchable electrical polarization that is manifested in the form of cooperative atomic displacements that arises through the quantum mechanical phenomenon of exchange.
Journal ArticleDOI
Epitaxial BiFeO3 multiferroic thin film heterostructures.
Jian Wang,Jeffrey B. Neaton,Haimei Zheng,Valanoor Nagarajan,Satishchandra Ogale,B. T. Liu,Dwight Viehland,V. Vaithyanathan,Darrell G. Schlom,Umesh V. Waghmare,Nicola A. Spaldin,Karin M. Rabe,Manfred Wuttig,Ramamoorthy Ramesh +13 more
TL;DR: Enhanced polarization and related properties in heteroepitaxially constrained thin films of the ferroelectromagnet, BiFeO3, and combined functional responses in thin film form present an opportunity to create and implement thin film devices that actively couple the magnetic and ferroelectric order parameters.
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Revival of the Magnetoelectric Effect
Abstract: Recent research activities on the linear magnetoelectric (ME) effect?induction of magnetization by an electric field or of polarization by a magnetic field?are reviewed. Beginning with a brief summary of the history of the ME effect since its prediction in 1894, the paper focuses on the present revival of the effect. Two major sources for 'large' ME effects are identified. (i) In composite materials the ME effect is generated as a product property of a magnetostrictive and a piezoelectric compound. A linear ME polarization is induced by a weak ac magnetic field oscillating in the presence of a strong dc bias field. The ME effect is large if the ME coefficient coupling the magnetic and electric fields is large. Experiments on sintered granular composites and on laminated layers of the constituents as well as theories on the interaction between the constituents are described. In the vicinity of electromechanical resonances a ME voltage coefficient of up to 90?V?cm?1?Oe?1 is achieved, which exceeds the ME response of single-phase compounds by 3?5 orders of magnitude. Microwave devices, sensors, transducers and heterogeneous read/write devices are among the suggested technical implementations of the composite ME effect. (ii) In multiferroics the internal magnetic and/or electric fields are enhanced by the presence of multiple long-range ordering. The ME effect is strong enough to trigger magnetic or electrical phase transitions. ME effects in multiferroics are thus 'large' if the corresponding contribution to the free energy is large. Clamped ME switching of electrical and magnetic domains, ferroelectric reorientation induced by applied magnetic fields and induction of ferromagnetic ordering in applied electric fields were observed. Mechanisms favouring multiferroicity are summarized, and multiferroics in reduced dimensions are discussed. In addition to composites and multiferroics, novel and exotic manifestations of ME behaviour are investigated. This includes (i) optical second harmonic generation as a tool to study magnetic, electrical and ME properties in one setup and with access to domain structures; (ii) ME effects in colossal magnetoresistive manganites, superconductors and phosphates of the LiMPO4 type; (iii) the concept of the toroidal moment as manifestation of a ME dipole moment; (iv) pronounced ME effects in photonic crystals with a possibility of electromagnetic unidirectionality. The review concludes with a summary and an outlook to the future development of magnetoelectrics research.
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Observation of coupled magnetic and electric domains
TL;DR: Spatial maps of coupled antiferromagnetic and ferroelectric domains in YMnO3 are obtained by imaging with optical second harmonic generation and lead to a configuration that is dominated by the ferroelectromagnetic product of the order parameters.
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Defects associated with the accommodation of misfit between crystals
TL;DR: In this article, a substantial fraction of the defects in epitaxial thin films are formed to accommodate part of the misfit between the stress-free lattice parameters of film and substrate.