Cycloid manipulation by electric field in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>BiFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>films: Coupling between polarization, octahedral rotation, and antiferromagnetic order

Popkov, A. F.; Kulagin, N. E.; Soloviov, S. V.; Sukmanova, K. S.; Gareeva, Z. V.; Zvezdin, A. K.

doi:10.1103/physrevb.92.140414

Cited by 22 publications

(11 citation statements)

References 42 publications

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“…For instance, it can possess a long period cycloid or a canted configuration in which a predominant G-type antiferromagnetism (AFM) coexists with a weak ferromagnetic vector 1,2 . Upon external stimuli, such as temperature, fields, strain and pressure, such two magnetic states can transform from one to another 1,[3][4][5][6][7][8][9][10] , which reflects spin-lattice couplings in BFO. More precisely, spins have been predicted to couple with both ferroelectric (FE) displacements and FeO 6 octahedral tiltings (also known as antiferrodistortive (AFD) motions) in BFO, see, e.g., Ref.…”

Section: Introductionmentioning

confidence: 99%

Magnetic interactions in BiFeO3 : A first-principles study

Dupé

et al. 2019

Phys. Rev. B

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First-principles calculations, in combination with the four-state energy mapping method, are performed to extract the magnetic interaction parameters of multiferroic BiFeO3. Such parameters include the symmetric exchange (SE) couplings and the Dzyaloshinskii-Moriya (DM) interactions up to second nearest neighbors, as well as the single ion anisotropy (SIA). All magnetic parameters are obtained not only for the R3c structural ground state, but also for the R3m and R3c phases in order to determine the effects of ferroelectricity and antiferrodistortion distortions, respectively, on these magnetic parameters. In particular, two different second-nearest neighbor couplings are identified and their origins are discussed in details. Moreover, Monte-Carlo (MC) simulations using a magnetic Hamiltonian incorporating these first-principles-derived interaction parameters are further performed. They result (i) not only in the accurate prediction of the spin-canted G-type antiferromagnetic structure and of the known magnetic cycloid propagating along a <110> direction, as well as their unusual characteristics (such as a weak magnetization and spin-density-waves, respectively); (ii) but also in the finding of another cycloidal state of low-energy and that awaits to be experimentally confirmed. Turning on and off the different magnetic interaction parameters in the MC simulations also reveal the precise role of each of them on magnetism.

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Section: Introductionmentioning

confidence: 99%

Magnetic interactions in BiFeO3 : A first-principles study

Dupé

et al. 2019

Phys. Rev. B

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“…[14][15][16] The propagation direction of the spin cycloid can be modified by switching the ferroelectric polarization 18 thus demonstrating prominent magnetoelectric coupling. Upon destruction of the cycloid-achievable by magnetic [19][20][21][22] or electric 23 field, strain, 24 doping, 25 or hydrostatic pressure 26 -a weak canted ferromagnetic moment is released. 27,28 To date, the majority of understanding has focused on the manipulation and engineering of this weak canted moment in thin films.…”

Section: Introductionmentioning

confidence: 99%

Expansion of the spin cycloid in multiferroic BiFeO3 thin films

Burns

Sando

et al. 2019

npj Quantum Mater.

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Understanding and manipulating complex spin texture in multiferroics can offer new perspectives for electric field-controlled spin manipulation. In BiFeO 3 , a well-known room temperature multiferroic, the competition between various exchange interactions manifests itself as non-collinear spin order, i.e., an incommensurate spin cycloid with period 64 nm. We report on the stability and systematic expansion of the length of the spin cycloid in (110)-oriented epitaxial Co-doped BiFeO 3 thin films. Neutron diffraction shows (i) this cycloid, despite its partly out-of-plane canted propagation vector, can be stabilized in thinnest films; (ii) the cycloid length expands significantly with decreasing film thickness; (iii) theory confirms a unique [112] cycloid propagation direction; and (iv) in the temperature dependence the cycloid length expands significantly close to T N. These observations are supported by Monte Carlo simulations based on a first-principles effective Hamiltonian method. Our results therefore offer new opportunities for nanoscale magnonic devices based on complex spin textures.

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“…This cycloid phase appears to be energetically competing with the G-AFM state, as evidenced by a transition from type-1 cycloid to G-AFM under small compressive strain 8 , magnetic field [9][10][11][12] , electric field 13,14 , doping 15 , and hydrostatic pressure 16 , strongly suggesting that these two phases are close in energy. Recently, a different (type-2) cycloid has been found in slightly tensile-strained (001) film 8 and (110) film on SrTiO 3 substrate 17,18 , which was proposed to propagate in the [112] direction.…”

Section: Introductionmentioning

confidence: 99%

Revisiting spin cycloids in multiferroic BiFeO3

Dupé

et al. 2018

Phys. Rev. B

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We revisit the inverse spin current model that has been previously used to explain the existence of magnetic cycloids in bulk multiferroic BiFeO3. Using a first-principles-based effective Hamiltonian method, and in combination with Monte Carlo simulations, we predict a magnetic phase diagram as function of first-and second-nearest-neighbor interaction strength in the spin current model, and show that, in contrast with previous understanding, both first and second nearest neighbors have to be taken into account to be in accordance with experimental findings, including the existence of type-1 and type-2 cycloids with, respectively, [110] and [112] propagation directions, and the cycloid-to-antiferromagnetic transition under magnetic field. Other previously unknown magnetic arrangements are found in this phase diagram. The microscopic origins of all its magnetic phases are further explained in terms of coexistence of single solutions of the spin current model having different weights (in magnitude and even sign).

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Cycloid manipulation by electric field inBiFeO3films: Coupling between polarization, octahedral rotation, and antiferromagnetic order

Cited by 22 publications

References 42 publications

Magnetic interactions in BiFeO3 : A first-principles study

Magnetic interactions in BiFeO3 : A first-principles study

Expansion of the spin cycloid in multiferroic BiFeO3 thin films

Revisiting spin cycloids in multiferroic BiFeO3

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