Temperature-dependent properties of the magnetic order in single-crystal BiFeO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Ramazanoglu, M.; Ratcliff, William; Choi, Young Jai; Lee, Seongsu; Cheong, Sang‐Wook; Kiryukhin, V.

doi:10.1103/physrevb.83.174434

Cited by 100 publications

(99 citation statements)

References 35 publications

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“…Refining the ellipticity of the cycloid (M z /M ) does not lead to significant improvements. This, and the failure to observe higher order magnetic satellites, supports the picture of a harmonic modulation at 300K, discussed in [14,15]. No improvements of the fit were obtained by considering a slight tilt of the cycloidal plane, as recently suggested [16].…”

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confidence: 87%

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

et al. 2013

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Magnetic domains at the surface of a ferroelectric monodomain BiFeO3 single crystal have been imaged by hard X-ray magnetic scattering. Magnetic domains up to several hundred microns in size have been observed, corresponding to cycloidal modulations of the magnetization along the wavevector k=(δ,δ,0) and symmetry equivalent directions. The rotation direction of the magnetization in all magnetic domains, determined by diffraction of circularly polarized light, was found to be unique and in agreement with predictions of a combined approach based on a spin-model complemented by relativistic density-functional simulations. Imaging of the surface shows that the largest adjacent domains display a 120 • vortex structure.

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confidence: 87%

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

et al. 2013

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“…We note that any ferroelastic contribution to the PEEM contrast [5] can be ruled out as our (111) film is a single ferroelectric monodomain. The magnetic origin of the PEEM contrast is further corroborated by its temperature dependence (60 % reduction at 475 K), which was found to be quantitatively consistent with the temperature dependence of the ordered moment [34], and was reversed upon cooling.…”

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confidence: 57%

Coherent Magnetoelastic Domains in Multiferroic BiFeO3 Films

et al. 2016

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The physical properties of epitaxial films can fundamentally differ from those of bulk single crystals even above the critical thickness. By a combination of non-resonant x-ray magnetic scattering, neutron diffraction and vector-mapped x-ray magnetic linear dichroism photoemission electron microscopy, we show that epitaxial (111)-BiFeO 3 films support sub-micron antiferromagnetic domains, which are magneto-elastically coupled to a coherent crystallographic monoclinic twin structure. This unique texture, which is absent in bulk single crystals, should enable control of magnetism in BiFeO 3 film devices via epitaxial strain.PACS numbers: 77.55. Nv, 68.37.Yz, 75.60.Ch, Electrical manipulation of spins in insulators is a promising route to a new generation of fast, low consumption electronics [1][2][3]. Although direct electrical control of ferromagnets is challenging, much progress has been made towards electrical switching of antiferromagnetic spins [4]. Multiferroic BiFeO 3 (BFO) is one of the most promising materials: at room temperature, BFO is both ferroelectric and antiferromagnetic, and its spins can be rotated by switching the direction of the electrical polarisation [5,6]. Thus far, a fundamental limitation towards practical BFO devices has been the lack of understanding of the interplay between ferroelectricity, ferromagnetism and lattice distortions (ferroelasticity). Using a combination of non-resonant x-ray magnetic scattering (NXMS), neutron diffraction and vectormapped x-ray magnetic linear dichroism photoemission electron microscopy (XMLD-PEEM), we show that the antiferromagnetic domain structure of 1 µm thick, epitaxial (111)-oriented BFO films displays a ≈100 nm-scale texture, dramatically different from the mm-size features in bulk single crystals. We also demonstrate that this magnetic texture is coherent (having matching topography and symmetry elements) with a pattern of monoclinic domains at the nanoscale. This texture is reminiscent of the dense polydomain states that are thermodynamically stable in ferroelectric perovskites such as PbTiO 3 in the presence of strain misfit [7]. This strongly suggests that the relaxed (111)-oriented BFO structure is not trigonal, but is a texture of coherent monoclinic micro twins. Besides providing a new pathway towards strainengineering multiferroic domains in BFO, our approach yielded a detailed picture of the interplay between magnetism and lattice over 5 orders of magnitude in length * p.g.radaelli@physics.ox.ac.uk scales, and could be applied to many classes of functional magnetic oxide devices.Below its ferroelectric Curie temperature of T C = 1103 K, bulk BFO is generally believed to possess a rhombohedrally-distorted perovskite structure with space group R3c (pictured in fig. 1(a) and (b)) [8,9], although very recent high-resolution synchrotron measurements have suggested a small monoclinic distortion [10]. The Bi 3+ and Fe 3+ cations are displaced away from their centrosymmetric positions along the (111) (pseudocubic setting) axis [11], producing a ...

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“…These parameters were almost constant at temperatures from 150 K to 320 K. The temperature dependence of the transition field to the IM phase could be a result of the change in κ c because the exchange stiffness and DM interaction are likely insensitive to temperature. Such temperature dependence of κ c may appear as the change in anharmonicity in the cycloidal order, which is observed experimentally [43]. According to a theoretical study [38], when κ c was increased, while holding the other parameters constant, the transition field to the AF-cone phase was reduced.…”

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confidence: 96%

Successive field-induced transitions in BiFeO3 around room temperature

Kawachi

Miyake

et al. 2017

Phys. Rev. Materials

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The effects of high magnetic fields applied perpendicular to the spontaneous ferroelectric polarization on single crystals of BiFeO3 were investigated through magnetization, magnetostriction, and neutron diffraction measurements. The magnetostriction measurements revealed lattice distortion of 2 × 10 −5 , during the reorientation process of the cycloidal spin order by applied magnetic fields. Furthermore, anomalous changes in magnetostriction and electric polarization at a larger field demonstrate an intermediate phase between cycloidal and canted antiferromagnetic states, where a large magnetoelectric effect was observed. Neutron diffraction measurements clarified that incommensurate spin modulation along [110] Recently, multiferroic materials have been widely investigated due to their coupling between magnetic and ferroelectric ordering. BiFeO 3 is perhaps the most extensively studied multiferroic material as it possesses robust multiferroicity at room temperature as well as various possible applications [1][2][3][4][5][6][7][8][9][10]. The effects of magnetic fields on the coupled multiple degrees of freedom behind these phenomena are not fully understood.BiFeO 3 exhibits a cycloidal magnetic order below 640 K [11]. This state is known to exhibit marginal quadratic magnetoelectric (ME) effect at low magnetic fields [12]. High magnetic fields of ∼20 T stabilize the canted antiferromagnetic (CAFM) phase as opposed to the cycloidal phase [13][14][15][16][17]. Although several groups succeeded in realizing the CAFM phase at zero field [18][19][20][21][22][23], the ME effect in this phase has not been clarified. In this study, several features were observed when a magnetic field was applied normal to the trigonal c-axis, and they indicated that a third magnetic phase emerged in bulk BiFeO 3 between the cycloidal and CAFM phases at approximately room temperature.BiFeO 3 has a crystal structure with the polar space group of R3c. A large switchable spontaneous electric polarization emerges along the c-axis of the trigonal cell [24][25][26]. Degeneracy exists in selecting the polarization direction from eight 111 directions in the cubic unit. Hence, depending on synthesis methods, BiFeO 3 crystals can contain multiple ferroelectric domains [27].Magnetic domains can be present even in single ferroelectric domain crystals. The magnetic propagation vector Q points in one of the 110 directions of the trigonal cell [11] in the cycloidal spin ordered state below ∼640 K. The three-fold rotational symmetry around the c-axis (Z direction in this paper) leads to three equivalent Q i (i = 1, 2, 3), as shown in Fig. 1(d). The spins rotated primarily in the Q i -Z plane in a magnetic domain with a given Q i .Recently, Tokunaga et al. indicated the emergence of an electric polarization perpendicular to the Z direction that was controlled by magnetic fields [17]. Theoretical calculations suggested that the cycloidal spin order in BiFeO 3 could involve electric polarization perpendicular to the Q i -Z plane as illustrated as P T in...

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Temperature-dependent properties of the magnetic order in single-crystal BiFeO3

Cited by 100 publications

References 35 publications

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

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

Coherent Magnetoelastic Domains in Multiferroic BiFeO3 Films

Successive field-induced transitions in BiFeO3 around room temperature

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