X-Ray Imaging and Multiferroic Coupling of Cycloidal Magnetic Domains in Ferroelectric Monodomain<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BiFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Johnson, Roger A.; Barone, Paolo; Bombardi, A.; Bean, Richard; Picozzi, Silvia; Radaelli, P. G.; Oh, Yoon Seok; Cheong, Sang‐Wook; Chapon, L. C.

doi:10.1103/physrevlett.110.217206

Cited by 76 publications

(38 citation statements)

References 28 publications

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“…The coupling between the magnetic polarity and FE polarization is parametrized by β = − λ·n |λ| , wherê n is the film surface normal. In agreement with a previous study on a bulk single crystal sample 9 , we find that magnetic polarity of a given domain is aligned antiparallel to the FE polarization, hence β = +1 or −1 for the fully-polarized FE ↑ state and FE ↓ state, respectively.…”

Section: Resultssupporting

confidence: 79%

Electrical Switching of Magnetic Polarity in a Multiferroic BiFeO3 Device at Room Temperature

et al. 2017

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We have directly imaged reversible electrical switching of the cycloidal rotation direction (magnetic polarity) in a (111)pc-BiFeO3 epitaxial-film device at room temperature by non-resonant x-ray magnetic scattering. Consistent with previous reports, fully relaxed (111)pc-BiFeO3 epitaxial films consisting of a single ferroelectric domain were found to comprise a sub-micron-scale mosaic of magneto-elastic domains, all sharing a common direction of the magnetic polarity, which was found to switch reversibly upon reversal of the ferroelectric polarization without any measurable change of the magneto-elastic domain population. A real-space polarimetry map of our device clearly distinguished between regions of the sample electrically addressed into the two magnetic states with a resolution of a few tens of micron. Contrary to the general belief that the magneto-electric coupling in BiFeO3 is weak, we find that electrical switching has a dramatic effect on the magnetic structure, with the magnetic moments rotating on average by 90• at every cycle.

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Section: Resultssupporting

confidence: 79%

Electrical Switching of Magnetic Polarity in a Multiferroic BiFeO3 Device at Room Temperature

et al. 2017

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“…ions [6] give rise to a large spontaneous polarization P s * 100 lC/cm 2 [7]. The polarization affects the magnetic ordering of Fe through the inhomogeneous magnetoelectric interaction [8], thus stabilizing the complex magnetic structure that can be described locally as canted G-type, but with a long-period (k * 620 Å ) cycloidal modulation with the spins rotating in the (k, P) plane [the wave vector k can take the three symmetry-equivalent directions k 1 = (d, d, 0), k 2 = (d, -2d, 0), and k 3 = (-2d, d, 0) in the hexagonal setting of the R3c group] [9]. The existence of the magnetic modulation explains the absence of the weak ferromagnetism allowed by the crystal symmetry of BiFeO 3 [10].…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic–weak ferromagnetic transition in lightly doped BiFeO3: role of structural defects

Khomchenko

Paixão

2015

J Mater Sci

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Chemical substitution is commonly considered as favoring the suppression of the cycloidal magnetic structure specific to the polar phase of multiferroic BiFeO 3 . To reveal the factors underlying the substitution-driven instability of the antiferromagnetic order, synthesis and investigation of the crystal structure, microstructure, local ferroelectric, and magnetic properties of the ceramic samples of Bi 0.95 A 0.05 Fe 0.95 B 0.05 O 3 (A = Pr, Ca; B = Mn, Ti) were carried out. The investigation did not reveal any link between the size of the substituting ions and the magnetic behavior of the compounds. However, it found a clear correlation between the magnetic ground state and the morphology/defect structure of the ceramics, as traced by the scanning probe microscopy. The results of the work suggest that the magnetic cycloid should be less stable in those doped materials, in which the charge-compensating mechanism involves the formation of crystal lattice defects.

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“…On the other hand, magnetism is guaranteed by the B-site magnetic Fe 3+ (d 5 ) ions. Due to the independent origin of ferroelectricity and magnetism in this type of multiferroics, the magnetoelectric coupling has been long thought to be rather small; however, a number of recent observations indicate that magnetoelectric effects in BiFeO 3 can be significant, suggesting also an important role played by the large ferroelectric polarization in modulating the magnetic ordering [51][52][53][54]. These recent findings suggest potential relevance also in this class of proper multiferroics, where the inherently giant ferroelectric polarization together with unusual magnetoelectric effects can find interesting technological applications.…”

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Structural and ferroelectric transitions in magnetic nickelate PbNiO₃

et al. 2014

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Density functional calculations have been tremendously useful in understanding the microscopic origin of multiferroicity and in quantifying relevant properties in many multiferroics and magnetoelectrics. Here, we focus on a relatively new and promising compound, PbNiO 3 . The structural, electronic and magnetic properties of its two polymorphs, i.e. the orthorhombic structure with space group Pnma and the rhombohedral LiNbO 3 -type structure with space group R3c have been studied by using density functional calculations within DFT+U and hybrid functional schemes. Our data convey an accurate description of the pressure-induced phase transition from the rhombohedral to orthorhombic phase at a predicted critical pressure of 5 GPa in agreement with the measured value of 3 GPa. Both phases show the G-type antiferromagnetic configuration as a magnetic ground state, but differ in the spatial anisotropy associated with nearest-neighbor exchange couplings, which is strongly weakened in the rhombohedral LiNbO 3 -type phase. The predicted large ferroelectric polarization of the rhombohedral phase (Hao et al 2012 Phys. Rev. B 014116) has been reexplored and analyzed in detail using partial density of states, Born effective New J. Phys. 16 (2014) 015030 X F Hao et al charge tensors, charge density difference, electron localization function analysis and distortion mode analysis. The asymmetric bonding between the Pb 6s and O 2p orbitals along the [111]-direction is responsible for the polar cationic displacement, giving rise to a predicted large ferroelectric polarization as high as ∼100 µC cm −2 .

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X-Ray Imaging and Multiferroic Coupling of Cycloidal Magnetic Domains in Ferroelectric MonodomainBiFeO3

Cited by 76 publications

References 28 publications

Electrical Switching of Magnetic Polarity in a Multiferroic BiFeO3 Device at Room Temperature

Electrical Switching of Magnetic Polarity in a Multiferroic BiFeO3 Device at Room Temperature

Antiferromagnetic–weak ferromagnetic transition in lightly doped BiFeO3: role of structural defects

Structural and ferroelectric transitions in magnetic nickelate PbNiO₃

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X-Ray Imaging and Multiferroic Coupling of Cycloidal Magnetic Domains in Ferroelectric MonodomainBiFeO3

Cited by 76 publications

References 28 publications

Electrical Switching of Magnetic Polarity in a Multiferroic BiFeO3 Device at Room Temperature

Electrical Switching of Magnetic Polarity in a Multiferroic BiFeO3 Device at Room Temperature

Antiferromagnetic–weak ferromagnetic transition in lightly doped BiFeO3: role of structural defects

Structural and ferroelectric transitions in magnetic nickelate PbNiO3

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Product

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Structural and ferroelectric transitions in magnetic nickelate PbNiO₃