Ferroelectrically Induced Weak Ferromagnetism by Design

Fennie, Craig J.

doi:10.1103/physrevlett.100.167203

Cited by 204 publications

(200 citation statements)

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“…This could be particularly interesting for technological applications for the fol- 43 or phononic exitation), the wFM could be switched on and off through the competition between the SIA shapes (easy-plane versus easy-axis) of the AFD and FE distortions. This process could be more readily attainable than the reversal of wFM that has been discussed previously 6,8 and opens the door to new design rules for controlling magnetism by nonmagnetic external parameters.…”

Section: Discussionmentioning

confidence: 99%

“…However, such an ideal compound is not known today. A particularly promising direction is to switch magnetization by 180 • using an electric field in materials exhibiting weak ferromagnetism (wFM) 6,7 . In weak ferromagnets, the magnetization is small, but it has been proposed theoretically that in the presence of a ferroelectric polarization one can switch the wFM by reversing the polarization [6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

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Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

2012

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The link between the crystal distortions of the perovskite structure and the magnetic exchange interaction, the single-ion anisotropy (SIA) and the Dzyaloshinsky-Moriya (DM) interaction are investigated by means of density-functional calculations. Using BiFeO3 and LaFeO3 as model systems, we quantify the relationship between the oxygen octahedra rotations, the ferroelectricity and the weak ferromagnetism (wFM). We recover the fact that the wFM is due to the DM interaction induced by the oxygen octahedra rotations. We find a simple relationship between the wFM, the oxygen rotation amplitude and the ratio between the DM vector and the exchange parameter such as the wFM increases with the oxygen octahedra rotation when the SIA does not compete with the DM forces induced on the spins. Unexpectedly, we also find that, in spite of the d 5 electronic configuration of Fe 3+ , the SIA is very large in some structures and is surprisingly strongly sensitive to the chemistry of the A-site cation of the ABO3 perovskite. In the ground R3c state phase we show that the SIA shape induced by the ferroelectricity and the oxygen octahedra rotations are in competition such as it is possible to tune the wFM "on" and "off" through the relative size of the two types of distortion.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

2012

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“…Recent advances in computational power and algorithm development make it possible to rationalize experimental observations, investigate possible mechanisms for ME coupling, and even to design new MF materials [85][86][87].…”

Section: (E) First-principles Studiesmentioning

confidence: 99%

Multi-ferroic and magnetoelectric materials and interfaces

Velev

Jaswal

Tsymbal

2011

Phil. Trans. R. Soc. A.

208

144

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The existence of multiple ferroic orders in the same material and the coupling between them have been known for decades. However, these phenomena have mostly remained the theoretical domain owing to the fact that in single-phase materials such couplings are rare and weak. This situation has changed dramatically recently for at least two reasons: first, advances in materials fabrication have made it possible to manufacture these materials in structures of lower dimensionality, such as thin films or wires, or in compound structures such as laminates and epitaxial-layered heterostructures. In these designed materials, new degrees of freedom are accessible in which the coupling between ferroic orders can be greatly enhanced. Second, the miniaturization trend in conventional electronics is approaching the limits beyond which the reduction of the electronic element is becoming more and more difficult. One way to continue the current trends in computer power and storage increase, without further size reduction, is to use multi-functional materials that would enable new device capabilities. Here, we review the field of multi-ferroic (MF) and magnetoelectric (ME) materials, putting the emphasis on electronic effects at ME interfaces and MF tunnel junctions.

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“…The experimental search for robust room-temperature (T room ) multiferroics is proving a major challenge. The first-principles contribution to this effort is quickly increasing, as shown by recent predictions of new materials [2,3,4] and novel ME coupling mechanisms [5,6,7]. Yet, many key issues remain to be addressed theoretically, as even the ME response of the most promising systems (e.g., thin films of BiFeO 3 [8]) still needs to be characterized and understood in detail.…”

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confidence: 99%

Magnetoelectric Response of MultiferroicBiFeO3and Related Materials from First-Principles Calculations

Wojdeł

Íñiguez

2009

Phys. Rev. Lett.

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We present a first-principles scheme for computing the magnetoelectric response of multiferroics. We apply our method to BiFeO3 (BFO) and related compounds in which Fe is substituted by other magnetic species. We show that under certain relevant conditions -i.e., in absence of incommensurate spin modulation, as in BFO thin films and some BFO-based solid solutions -these materials display a large linear magnetoelectric response. Our calculations reveal the atomistic origin of the coupling and allow us to identify the most promising strategies to enhance it.PACS numbers: 75.80.+q, 71.15.Mb Magnetoelectric (ME) multiferroics present coupled electric and magnetic orders [1], which may allow the development of a variety of magnetic devices, from memories to spin filters, whose behavior would be switchable by application of a voltage. The experimental search for robust room-temperature (T room ) multiferroics is proving a major challenge. The first-principles contribution to this effort is quickly increasing, as shown by recent predictions of new materials [2,3,4] and novel ME coupling mechanisms [5,6,7]. Yet, many key issues remain to be addressed theoretically, as even the ME response of the most promising systems (e.g., thin films of BiFeO 3 [8]) still needs to be characterized and understood in detail. Here we describe a method for ab initio computations of the ME response of multiferroics, tackling the strainmediated contributions that typically exist in these materials. We apply our method to BiFeO 3 and related compounds.Methodology.-The response of a linear magnetoelectric that is not multiferroic -and is thus paraelectriccan be split in two contributions [9]: a purely electronic one and an ionic one. The ionic part accounts for the structural response to an electric (magnetic) field and the resulting change of magnetization (polarization). When the linear magnetoelectric is multiferroic -and thus ferroelectric -there is a third contribution associated to the piezoelectric response to the electric field. Indeed, it can be shown that all commensurate [11] multiferroics must be piezomagnetic, as the symmetries that preclude piezomagnetism are broken in such systems [12]. Hence, the combination of piezoelectricity and piezomagnetism in multiferroics results in a strain-mediated contribution to the linear ME response.In order to model such effects, we have generalized to the magnetoelectric case the formalism that Wu, Vanderbilt, and Hamann [13] (WVH in the following) introduced for a systematic ab initio treatment of dielectric and piezoelectric responses. Let us consider how the energy of a multiferroic crystal varies as a function of the following perturbations: displacements u m of atoms away from their equilibrium positions, homogeneous strains η j , and applied electric (E α ) and magnetic (H µ ) fields. Here, m is a composite label that runs over the atoms in the unit cell and displacement directions, j runs from 1 to 6 in Voigt notation, and α and µ are Cartesian directions.We write the energy per unde...

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Ferroelectrically Induced Weak Ferromagnetism by Design

Cited by 204 publications

References 28 publications

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

Noncollinear magnetism and single-ion anisotropy in multiferroic perovskites

Multi-ferroic and magnetoelectric materials and interfaces

Magnetoelectric Response of MultiferroicBiFeO3and Related Materials from First-Principles Calculations

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