Coupled multiferroic domain switching in the canted conical spin spiral system Mn2GeO4

Honda, Toshio; White, J. S.; Harris, A. B.; Chapon, L. C.; Fennell, Amy; Roessli, B.; Zaharko, O.; Murakami, Youichi; Kenzelmann, M.; Kimura, T.

doi:10.1038/ncomms15457

Cited by 23 publications

(29 citation statements)

References 32 publications

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“…The term (A ic + B ic ) ∼ k ¡ 0 , however, merely retains the correct symmetry of the coupling, while X 1 (k 0 ) holds the domain structure that determines the parallel or antiparallel orientation of M z and P z such that F inv < 0 (Refs. 14,15). Reversal of the field H z reverses the Extended Data Figure 1…”

Section: Methodsmentioning

confidence: 87%

“…The multiferroic phase below 5.5 K is characterised by four magnetic order parameters associated with the co-existing magnetic propagation vectors k 0 = (0, 0, 0) and k ¡ 0 = (±0.136, ±0.211, 0). Two order parameters, X 1 (k 0 ) and X 3 (k 0 ), describe commensurate antiferromagnetic and ferromagnetic contributions, respectively, while two others, M D1 (k ¡ 0 ) and M D2 (k ¡ 0 ), describe incommensurate spiral components 6,14,15 . The magnetic point group symmetry is 2 and a spontaneous magnetization M z ∝ X 3 (k 0 ) and a magnetically induced electric polarization P z ∝ M D1,2 (k ¡ 0 ) coexist (see Methods and Extended Data Fig.…”

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confidence: 99%

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Magnetoelectric inversion of domain patterns

Leo

Carolus

White

et al. 2018

Nature

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The inversion of inhomogeneous physical states has great technological importance; for example, active noise reduction relies on the emission of an inverted sound wave that interferes destructively with the noise of the emitter, and inverting the evolution of a spin system by using a magnetic-field pulse enables magnetic resonance tomography. In contrast to these examples, inversion of a distribution of ferromagnetic or ferroelectric domains within a material is surprisingly difficult: field poling creates a single-domain state, and piece-by-piece inversion using a scanning tip is impractical. Here we report inversion of entire ferromagnetic and ferroelectric domain patterns in the magnetoelectric material CoTeO and the multiferroic material MnGeO, respectively. In these materials, an applied magnetic field reverses the magnetization or polarization, respectively, of each domain, but leaves the domain pattern intact. Landau theory indicates that this type of magnetoelectric inversion is universal across materials that exhibit complex ordering, with one order parameter holding the memory of the domain structure and another setting its overall sign. Domain-pattern inversion is only one example of a previously unnoticed effect in systems such as multiferroics, in which several order parameters are available for combination. Exploring these effects could therefore advance multiferroics towards new levels of functionality.

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Section: Methodsmentioning

confidence: 87%

mentioning

confidence: 99%

Magnetoelectric inversion of domain patterns

Leo

Carolus

White

et al. 2018

Nature

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“…So in all, these three independent binary choices gives rise to eight possible distinct domains, as already noted in Ref. [11].…”

Section: Equilibrium Phasesmentioning

confidence: 74%

Identifying Landau order parameters and their transformation properties for complex multiferroics: The case of Mn2GeO4

Harris

2017

Phys. Rev. B

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It is shown how to adapt the results of ISODISTORT to a more convenient form. For the case of Mn 2 GeO 4 we characterize the complex magnetic phase that exists at tmperature below 5.5K, by order parameters for both the commensurate ordering and the incommensurate ordering.For the incommensurate ordering we are forced to consider the transformation properties which interrelate magnetic modes at different noncollinear members of the star of the incommensurate wave vector. The transformation properties of the order parameters and of the underlying magnetic wave functions are developed. These results are applied to construct the high order invariants in the free energy which have been used elsewhere to describe the characteristics of switching between different domains.

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“…This was shown in the case of FeAs [29] (and also using polarized x-ray scattering) [30] and CeRhIn 5 [31,32] where the structures were found to be the spin density wave and helical arrangement, respectively. Furthermore, it is also for this reason that SNP can determine complex magnetic structures as shown in the cases of CaBa(Co 3 Fe)O 7 [33] and Mn 2 GeO 4 [34].…”

Section: Polarized Neutron Scatteringmentioning

confidence: 99%

Imitation of spin density wave order in Cu3Nb2O8

et al. 2020

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Spin density waves, based on modulated local moments, are usually associated with metallic materials, but have recently been reported in insulators which display coupled magnetic and structural order parameters. We discuss one such example, the multiferroic Cu 3 Nb 2 O 8 , which is reported to undergo two magnetic phase transitions, first to an unknown antiferromagnetic phase at T N ≈ 26.5 K, and then to a helicoidal structure coupled to an electric polarization below T 2 ≈ 24 K [R. D. Johnson et al., Phys. Rev. Lett. 107, 137205 (2011)] which breaks the crystallographic inversion symmetry. By analogy with other complex oxides, one might naturally expect this intermediate phase to be a spin density wave phase. We apply spherical polarimetry to confirm the low-temperature magnetic structure, yet only observe a single magnetic phase transition to helicoidal order. We argue that the reported unknown phase actually supports an imitation spin density wave which originates from a decoupling of the components of the magnetic order parameter, as allowed by symmetry and driven by thermal fluctuations. This provides a mechanism for the magnetic, but not nuclear, structure to break inversion symmetry thereby creating an intermediate phase in the proximity of T N which imitates a spin density wave. As the temperature is reduced, this intermediate structure destabilizes the crystal such that a structural chirality is induced, as reflected by the emergence of the electric polarization, and the imitation spin density wave relaxes into a generic helicoid. This scenario in which critical fluctuations allow the magnetic structure to break inversion symmetry while the crystal structure remains centrosymmetric might be relevant to other complex multiferroics.

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Coupled multiferroic domain switching in the canted conical spin spiral system Mn2GeO4

Cited by 23 publications

References 32 publications

Magnetoelectric inversion of domain patterns

Magnetoelectric inversion of domain patterns

Identifying Landau order parameters and their transformation properties for complex multiferroics: The case of Mn2GeO4

Imitation of spin density wave order in Cu3Nb2O8

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