Time-resolved imaging of magnetoelectric switching in multiferroic MnWO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>4</mml:mn></mml:msub></mml:math>

Hoffmann, Tim; Thielen, Peter A.; Becker, Petra; Bohatý, L.; Fiebig, Manfred

doi:10.1103/physrevb.84.184404

Cited by 53 publications

(44 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The steep increase of ν 0 in the vicinity of T N 2 denotes the softening of the switching process in the vicinity of the continuous multiferroic phase transition. However, away from the second order multiferroic phase transition, the switching time for stimulating fields of 1 kV/mm lies in the millisecond range, which is relatively slow compared to canonical ferroelectrics (e.g., 34,39 ), but is in accordance with reports on such slow switching in MnWO 4 obtained in time domain studies 17,18 . The effective switching rate forms a minimum and slightly re-increases on approaching T N 1 , as already implied by the P sw (T ) data discussed above.…”

Section: Domain Dynamics In the Multiferroic Phasesupporting

confidence: 89%

“…Even though the dimensional meaning of this number should not be overemphasized it is in accord with the reduced dimensionality observed via the direct SHGimaging of the domains, which have the shape of elongated bubbles and show one-dimensional growth 16 . A small orientational preference with respect to the magnetic easy-axis and a shape dependence on the electric poling history was observed 16,17 . The domains are large objects with extension above µm and for the preferred direction even up to mm, i.e.…”

Section: Domain Dynamics In the Multiferroic Phasementioning

confidence: 95%

“…But even though one avoids these latter contributions by choosing a suitable, i.e. well insulating, high purity single crystalline material as we did in this study, the formation of domains and their emergent dynamics will dominate the dielectric response of the multiferroic system [15][16][17][18] .…”

mentioning

confidence: 99%

See 2 more Smart Citations

Domain dynamics in the multiferroic phase ofMnWO4

et al. 2014

Self Cite

View full text Add to dashboard Cite

By using broadband linear and non-linear dielectric spectroscopy we studied the magnetoelectric dynamics in the chiral antiferromagnet MnWO4. In the multiferroic phase the dielectric response is dominated by the dynamics of domains and domain walls which is strongly dependent on the stimulating electric field. The mean switching time reaches values in the minute range in the middle of the multiferroic temperature regime at T ≈ 10 K but unexpectedly decays again on approaching the lower, first-order phase boundary at TN1 ≈ 7.6 K. The switchability of the ferroelectric domains denotes a pinning-induced threshold and can be described considering a growth-limited scenario with an effective growth dimension of d ≈ 1.8. The rise of the effective dynamical coercive field on cooling below the TN2 is much stronger compared to the usual ferroelectrics and can be described by a power law Ec ∝ ν 1/2 . The latter questions the feasibility of fast switching devices based on this type of material.PACS numbers: 75.85.+t, 75.30.Mb, 75.60.Ch A. IntroductionIn recent years magnetoelectric multiferroics have attracted considerable interest within the community of correlated transition-metal compounds 1,2 . In these compounds ferroelectric order and magnetism do not only coexist in a single phase but exhibit strong coupling of the ferroic order parameters. Among other mechanisms the probably most established magnetoelectric coupling scenario is based on the inverse Dzyaloshinskii-Moriya (DM) interaction in partially frustrated spiral magnets 3,4 . This type of magnetically driven ferroelectricity is the underlying mechanism, e.g., in the numerously studied family of multiferroic manganites such as TbMnO 3 5,6 and in principle is now well understood. In these compounds a non-collinear cycloidal spin-structure is directly coupled to a ferroelectric polarization resulting from the coherent distortion of the Mn-O-Mn bonds perpendicular to the propagation vector of the spin-cycloid. However, the manifestation of a magnetoelectrically coupled multiferroic phase and the formation of the complex, magnetoelectric order parameter raises questions concerning the corresponding dynamics.One aspect is given by the elementary excitations within the ordered multiferroic phase, the so called electromagnons, as they were detected, e.g., in perovskite manganites in a typically sub-phononic region below terahertz frequencies 7-9 . Another aspect is the low frequency dielectric response originating from intrinsic or extrinsic sample inhomogeneities. In materials with a residual conductivity, which in addition may be dependent on external fields, contributions of contacts or grain boundaries may add capacitive or even magneto-capacitive contributions, which will cover the intrinsic sample properties 10-13 . Also one may find relaxational features resulting from localized polarons at defect states as, e.g., demonstrated for the case of perovskite rare-earth manganites above and within the multiferroic phase 14 . But even though one avoids these latter...

show abstract

Section: Domain Dynamics In the Multiferroic Phasesupporting

confidence: 89%

Section: Domain Dynamics In the Multiferroic Phasementioning

confidence: 95%

See 1 more Smart Citation

Domain dynamics in the multiferroic phase ofMnWO4

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…Phenomenologically it has been demonstrated that a reorientation by acting on the improper (electric) order parameter tends to be slow with reversal times in the millisecond range 38,39 . By acting on the primary (magnetic) order parameter, theory predicts scenarios with a reversal within a few picoseconds, yet at so far unrealistically large fields 40 .…”

Section: Discussionmentioning

confidence: 99%

Polarization control at spin-driven ferroelectric domain walls

et al. 2015

View full text Add to dashboard Cite

Unusual electronic states arise at ferroelectric domain walls due to the local symmetry reduction, strain gradients and electrostatics. This particularly applies to improper ferroelectrics, where the polarization is induced by a structural or magnetic order parameter. Because of the subordinate nature of the polarization, the rigid mechanical and electrostatic boundary conditions that constrain domain walls in proper ferroics are lifted. Here we show that spin-driven ferroelectricity promotes the emergence of charged domain walls. This provides new degrees of flexibility for controlling domain-wall charges in a deterministic and reversible process. We create and position a domain wall by an electric field in Mn 0.95 Co 0.05 WO 4 . With a magnetic field we then rotate the polarization and convert neutral into charged domain walls, while its magnetic properties peg the wall to its location. Using atomistic Landau-Lifshitz-Gilbert simulations we quantify the polarization changes across the two wall types and highlight their general occurrence.

show abstract

“…In multiferroics the problem of fast switching is not fully settled. Due to low static electric polarization in spin-driven multiferroics [6,27] substantial degradation of the switching time has been reported [28]. Extremely short switching times of electric polarization and of magnetization can be reached using pulsed laser light.…”

mentioning

confidence: 99%

Switching of Magnons by Electric and Magnetic Fields in Multiferroic Borates

et al. 2018

View full text Add to dashboard Cite

Electric manipulation of magnetic properties is a key problem of materials research. To fulfil the requirements of modern electronics, these processes must be shifted to high frequencies. In multiferroic materials this may be achieved by electric and magnetic control of their fundamental excitations. Here we identify magnetic vibrations in multiferroic iron-borates which are simultaneously sensitive to external electric and magnetic fields. Nearly 100 % modulation of the terahertz radiation in an external field is demonstrated for SmFe3(BO3)4. High sensitivity can be explained by a modification of the spin orientation which controls the excitation conditions in multiferroic borates. These experiments demonstrate the possibility to alter terahertz magnetic properties of materials independently by external electric and magnetic fields.

show abstract

Time-resolved imaging of magnetoelectric switching in multiferroic MnWO4

Cited by 53 publications

References 27 publications

Domain dynamics in the multiferroic phase ofMnWO4

Domain dynamics in the multiferroic phase ofMnWO4

Polarization control at spin-driven ferroelectric domain walls

Switching of Magnons by Electric and Magnetic Fields in Multiferroic Borates

Contact Info

Product

Resources

About