Origin of the Monoclinic-to-Monoclinic Phase Transition and Evidence for the Centrosymmetric Crystal Structure of BiMnO<sub>3</sub>

Belik, Alexei А.; Iikubo, Satoshi; Yokosawa, Tadahiro; Kodama, Kazuhisa; Igawa, Naoki; Shamoto, S.; Azuma, Masaki; Takano, Mikio; Kimoto, Koji; Matsui, Y.; Takayama‐Muromachi, E.

doi:10.1021/ja0664032

Cited by 206 publications

(294 citation statements)

References 38 publications

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“…15 If the crystal structure of BMO is indeed centrosymmetric, then the possible reasons for the ferroelectric behavior of BMO thin films are: (1) structural distortions due to oxygen vacancies, 15 (2) a centrosymmetric to non-centrosymmetric transition below T C i.e. below 100 K, 15 and (3) substrate induced strain.…”

Section: Concentrationsmentioning

confidence: 99%

Growth and characterization of multiferroic BiMnO3 thin films

Jeen

Singh‐Bhalla

Mickel

et al. 2011

Journal of Applied Physics

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We have grown epitaxial thin films of multiferroic BiMnO 3 using pulsed laser deposition. The films were grown on SrTiO 3 (001) substrates by ablating a Bi-rich target. Using x-ray diffraction we confirmed that the films were epitaxial and the stoichiometry of the films was confirmed using Auger electron spectroscopy. The films have a ferromagnetic Curie temperature (T C ) of 85±5 K and a saturation magnetization of 1 µ B /Mn. The electric polarization as a function of electric field (P − E) was measured using an interdigital capacitance geometry. The P − E plot shows a clear hysteresis that confirms the multiferroic nature of the thin films.PACS numbers: Valid pacs appear here Multiferroic materials are unique in that they exhibit both ferromagnetism and ferroelectricity simultaneously. 1 Such materials may be used to fabricate devices such as magnetic tunnel junctions with electrically tunable tunneling magnetoresistance and multiple state memory elements. 2 The recent interest in multiferroics is fueled both by the potential device applications and questions about the underlying physical principles leading to multiferroism. 3-7 Bulk multiferroic materials are rare, possibly due to conflicting requirements for ferromagnetism (FM) and ferroelectricity (FE). BiMnO 3 is perhaps the most fundamental multiferroic and has been referred to as the "hydrogen atom" of multiferroics. 8 In BiMnO 3 (BMO), as in BiFeO 3 , the 6s 2 lone pair on the Bi-ion leads to the displacement of that ion from the centrosymmetric position at the A-site of a perovskite unit cell. The resultant distortion leads to an FM interaction between the Mn-ions at the B-site in BMO. 9,10 In bulk form BMO has been observed to be both FM and FE. 11 Polycrystalline BMO can be grown under high pressure and within a very narrow range of growth conditions. While thin films of BMO have been grown by various groups, few such films have shown magnetic properties similar to bulk BMO and high enough resistivities i.e. low leakage currents to allow clear measurement of FE properties. 12-14 A possible reason for the low resistivities of BMO thin films is the substrate induced strain which exacerbates the growth of a highly distorted perovskite structure. Additionally, recent electron and neutron diffraction data have cast doubt over the purported non-centrosymmetry of the BMO crystal structure 15 and centrosymmetric structures have also been predicted using density functional theory calculations 16 . Since a non-centrosymmetric crystal a) Presently at: Department of Physics, University of California, Berkeley, California 94720, USA and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA b) Also at: Nanoscience Institute of Medical and Engineering Technology, University of Florida, 32611 c) Electronic mail: amlan@phys.ufl.edu structure is essential for ferroelectricity, the observed ferroelectric behavior of BMO may be due to strain and/or ordered oxygen vacancies. 17,18 BMO has a distorted perovskite-type structure ...

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Section: Concentrationsmentioning

confidence: 99%

Growth and characterization of multiferroic BiMnO3 thin films

Jeen

Singh‐Bhalla

Mickel

et al. 2011

Journal of Applied Physics

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“…However, the occurrence of ferroelectricity in this system has been challenged by a comparative analysis of electron and neutron diffraction data showing that polycrystalline BMO belongs instead to the centrosymmetric monoclinic C2/c space group, thus incompatible with proper ferroelectricity. 4,5 More recently, Solovyev and Pchelkina 6 proposed improper ferroelectricity of BiMnO 3 due to the competition between the ferromagnetic phase and a hidden antiferromagnetic phase, characterized by canted Mn spins and a threedimensional (3D) orbital order arrangement. The balance between these complex states could be tuned by applying external pressure 7 or epitaxial strain.…”

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confidence: 99%

“…These values are smaller than 4 l B =Mn corresponding to fully aligned Mn 3þ . 4 To investigate the ferroelectric properties of the films, we have grown BMO on metallic LaNiO 3 buffer layers (deposited on STO) by off-axis rf-sputtering at University of Geneva. 16 While the in plane resistivity is very large even at room temperature, in particular for thin pseudo-cubic films, standard ferroelectric test measurements in a sandwich configuration failed due to the high leakage.…”

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confidence: 99%

Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films

Luca¹,

Preziosi²,

Chiarella³

et al. 2013

Applied Physics Letters

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We studied the ferroelectric and ferromagnetic properties of compressive strained and unstrained BiMnO3 thin films grown by rf-magnetron sputtering. BiMnO3 samples exhibit a two-dimensional cube-on-cube growth mode and a pseudo-cubic structure up to a thickness of 15 nm and of 25 nm when deposited on (001) SrTiO3 and (110) DyScO3, respectively. Above these thicknesses, we observe a switching to a three-dimensional island growth mode and a simultaneous structural change to a (00l) oriented monoclinic unit cell. While ferromagnetism is observed below a T-C approximate to 100K for all samples, signatures of room temperature ferroelectricity were found only in the pseudo-cubic ultra-thin films, indicating a correlation between electronic and structural orders

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“…However, very recently Belik et.al. [19]. On the other hand there are no theoretical studies available explaining the ground state and the elastic properties of this compound to compare to our calculations.…”

Section: Introductionmentioning

confidence: 76%

“…Among ABO 3 -type multiferroic oxides, BiMnO 3 is a unique compound that displays true ferromagnetic behaviors with a Curie temperature (TC) of ~105 K [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Structural and Electronic Properties of Bixo<sub>3</sub> (X = Mn, Fe, Cr)

Bensaid¹,

Benkhettou²,

Kourdassi³

2011

JMP

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The candidate multiferroic BiCrO 3 and its chemical neighbors BiMnO 3 and BiFeO 3 are known to be ferromagnetic and ferroelectric respectively. With structural distortions driven by the strongly polarizable Bi ions, we present results of the first-principles density functional calculations using the (FP-LMTO) method with the spin-orbit coupling for those materials in the pseudo-cubic perovskite phase. The results showed that the valence bands in these compounds are formed by the 6p orbitals of bismuth and 3d orbital's of the transition metals. Our results indicate that these materials have metallic behavior for spin-up polarization but being a clear tandance for semiconductor spin-down BiMnO 3 .

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Origin of the Monoclinic-to-Monoclinic Phase Transition and Evidence for the Centrosymmetric Crystal Structure of BiMnO₃

Cited by 206 publications

References 38 publications

Growth and characterization of multiferroic BiMnO3 thin films

Growth and characterization of multiferroic BiMnO3 thin films

Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films

Structural and Electronic Properties of Bixo<sub>3</sub> (X = Mn, Fe, Cr)

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Origin of the Monoclinic-to-Monoclinic Phase Transition and Evidence for the Centrosymmetric Crystal Structure of BiMnO3

Cited by 206 publications

References 38 publications

Growth and characterization of multiferroic BiMnO3 thin films

Growth and characterization of multiferroic BiMnO3 thin films

Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films

Structural and Electronic Properties of Bixo&lt;sub&gt;3&lt;/sub&gt; (X = Mn, Fe, Cr)

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Origin of the Monoclinic-to-Monoclinic Phase Transition and Evidence for the Centrosymmetric Crystal Structure of BiMnO₃

Structural and Electronic Properties of Bixo<sub>3</sub> (X = Mn, Fe, Cr)