Interlocked chiral/polar domain walls and large optical rotation in Ni3TeO6

Wang, Xueyun; Huang, Fei‐Ting; Yang, Junjie; Oh, Yoon Seok; Cheong, Sang‐Wook

doi:10.1063/1.4927232

Cited by 28 publications

(29 citation statements)

References 27 publications

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“…It probably also has a spin origin and, because it has E symmetry, it could also be an electromagnon. Nevertheless, this mode is resolved in neither our nor previous 16 IR studies, so we cannot confirm its polar character.…”

Section: 7contrasting

confidence: 38%

“…15 Phonon anomalies due to spin-phonon coupling were observed near T N and a spin-flop transition close to 9 T, but also near 30 T, which suggest another magnetic phase transition at 30 T. 15 In addition, interlocked chiral and polar domain walls were observed at room temperature, unveiling a complex coupling between the chiral and polar order parameters. 16 Due to sum rules, the static magnetoelectric coupling should be governed by magnetoelectric excitations (electromagnons) in the GHz and/or THz regions. 17 These spin excitations can contribute to the dynamic magnetoelectric coupling between the magnetic permeability and dielectric permittivity, and if the magnetic structure is sensitive to the static magnetic or electric field, the electromagnons can be tuned by these fields.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoelectric excitations in multiferroic Ni3TeO6

et al. 2017

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The spin-order-induced ferroelectric anti-ferromagnet Ni 3 TeO 6 transcends the magnetoelectric performance of all other single-phase multiferroics, because it exhibits non-hysteretic colossal magnetoelectric coupling [Oh et al., Nat. Commun., 5, 3201 (2014)]. We investigated spin and lattice excitations in Ni 3 TeO 6 by a combination of infrared, Raman and THz spectroscopies. Two spin excitations (near 13 and 35 cm -1 ) were observed simultaneously in Raman and time-domain THz spectra below the Néel temperature T N =53 K. We propose to assign them to electromagnons, which are activated by the dynamic magnetoelectric coupling. A third magnon is seen only in the Raman spectra near 206 cm -1 .

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Section: 7contrasting

confidence: 38%

Section: Introductionmentioning

confidence: 99%

Magnetoelectric excitations in multiferroic Ni3TeO6

et al. 2017

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“…All three materials differ from Mn 2 MnWO 6 (described here) in that they are reported to have collinear magnetic structures with FM coupling between edge-shared magnetic sites within layers 49, 50 . The chiral, polar material Ni 3 TeO 6 51 has been the most thoroughly characterized and it is useful to compare its behavior with that of Mn 2 MnWO 6 . Theoretical studies on Ni 3 TeO 6 suggest that edge-linked Ni1 and Ni2 sites are coupled FM ( J 1 ) and that face-linked Ni2 and Ni3 sites are also coupled FM ( J 2 ).…”

Section: Resultsmentioning

confidence: 99%

Magnetostriction-polarization coupling in multiferroic Mn2MnWO6

McCabe

Stephens

et al. 2017

Nat Commun

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Double corundum-related polar magnets are promising materials for multiferroic and magnetoelectric applications in spintronics. However, their design and synthesis is a challenge, and magnetoelectric coupling has only been observed in Ni3TeO6 among the known double corundum compounds to date. Here we address the high-pressure synthesis of a new polar and antiferromagnetic corundum derivative Mn2MnWO6, which adopts the Ni3TeO6-type structure with low temperature first-order field-induced metamagnetic phase transitions (T N = 58 K) and high spontaneous polarization (~ 63.3 μC·cm−2). The magnetostriction-polarization coupling in Mn2MnWO6 is evidenced by second harmonic generation effect, and corroborated by magnetic-field-dependent pyroresponse behavior, which together with the magnetic-field-dependent polarization and dielectric measurements, qualitatively indicate magnetoelectric coupling. Piezoresponse force microscopy imaging and spectroscopy studies on Mn2MnWO6 show switchable polarization, which motivates further exploration on magnetoelectric effect in single crystal/thin film specimens.

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“…NTO has a noncentrosymmetric rhombohedral (trigonal crystal structure, space group R3 ) lattice with both chirality and polarity. It has three crystallographically inequivalent Ni sites (Ni I , Ni II and Ni III ), which can be thought of as comprising a superstructure of α-Al 2 O 3 11 . In NTO, the cation octahedra form Ni I O 6 -Ni II O 6 and Ni III O 6 -TeO 6 pairs by sharing the edges of octahedral faces [Fig.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy in the magnetic interaction and lattice-orbital coupling of single crystal Ni3TeO6

Ghosh

Chen

Qiu

et al. 2018

Sci Rep

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This investigation reports on anisotropy in the magnetic interaction, lattice-orbital coupling and degree of phonon softening in single crystal Ni3TeO6 (NTO) using temperature- and polarization-dependent X-ray absorption spectroscopic techniques. The magnetic field-cooled and zero-field-cooled measurements and temperature-dependent Ni L3,2-edge X-ray magnetic circular dichroism spectra of NTO reveal a weak Ni-Ni ferromagnetic interaction close to ~60 K (TSO: temperature of the onset of spin ordering) with a net alignment of Ni spins (the uncompensated components of the Ni moments) along the crystallographic c-axis, which is absent from the ab-plane. Below the Néel temperature, TN~ 52 K, NTO is stable in the antiferromagnetic state with its spin axis parallel to the c-axis. The Ni L3,2-edge X-ray linear dichroism results indicate that above TSO, the Ni 3d eg electrons preferentially occupy the out-of-plane 3d3z2−r2 orbitals and switch to the in-plane 3dx2−y2 orbitals below TSO. The inherent distortion of the NiO6 octahedra and anisotropic nearest-neighbor Ni-O bond lengths between the c-axis and the ab-plane of NTO, followed by anomalous Debye-Waller factors and orbital-lattice in conjunction with spin-phonon couplings, stabilize the occupied out-of-plane (3d3z2−r2) and in-plane (3dx2−y2) Ni eg orbitals above and below TSO, respectively.

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Interlocked chiral/polar domain walls and large optical rotation in Ni3TeO6

Cited by 28 publications

References 27 publications

Magnetoelectric excitations in multiferroic Ni3TeO6

Magnetoelectric excitations in multiferroic Ni3TeO6

Magnetostriction-polarization coupling in multiferroic Mn2MnWO6

Anisotropy in the magnetic interaction and lattice-orbital coupling of single crystal Ni3TeO6

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