Self-poling with oxygen off-stoichiometry in ferroelectric hexagonal manganites

Wang, Xueyun; Huang, Fei‐Ting; Hu, Rongwei; Fan, Fei; Cheong, Sang‐Wook

doi:10.1063/1.4908159

Cited by 28 publications

(29 citation statements)

References 36 publications

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“…One reason is that the vortex domain structure in thin films is much smaller than that in bulk single crystals, which is a few micrometres or larger. 11,14,17 This may be due to the thin-film geometry or/and the strain induced by substrates. In order to check this possibility, we performed the in-plane TEM observation.…”

Section: Resultsmentioning

confidence: 99%

“…Currently, the topological vortex domain structures in h-YMO and its similar partners h-RMnO 3 have been extensively reported. [11][12][13][14][15][16][17][18][19][20] For examples, Choi et al 11 reported the insulating interlocked ferroelectric and structural antiphase domain walls in h-YMO by conductive atomic force microscopy. Geng et al 12 reported a direct visualisation of the coupling between the magnetic and electric vortex domains in h-ErMnO 3 by piezoresponse and magnetic force microscopy.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of epitaxial hexagonal YMnO3 thin films and observation of ferroelectric vortex domains

et al. 2016

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Ferroelectric vortex is one of unique domain structures in the hexagonal RMnO 3 (R = Sc, Y, Ho-Lu) systems. This vortex pattern is quite sensitive to crystal imperfections, such as lattice defects and oxygen vacancies, which has been previously observed and studied in a single-crystal structure. Here we report epitaxial growth of hexagonal YMnO 3 thin films on platinum-coated Al 2 O 3 (0001) substrates. High-quality epitaxial YMnO 3 (0001)/Pt(111)/Al 2 O 3 (0001) heterostructures with sharp interfaces have been achieved and characterised by using X-ray diffractometry and transmission electron microscopy. Reversible ferroelectric domain structures have been achieved and observed with well-established piezoresponse hysteresis. Furthermore, the ferroelectric vortex domain patterns with a typical size of~20 nm have been observed, representing a significant progress in the fabrication and exploration of topological vortices in hexagonal RMnO 3 thin films.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of epitaxial hexagonal YMnO3 thin films and observation of ferroelectric vortex domains

et al. 2016

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“…Although most of our samples have FE domains with +P and -P domains in 50/50 ratio, known as type-I domains, some cleaved samples closed to the surface of crystals do show type-II narrow domains ( Figure S2) due to the self-poling effect during the annealing process, which is also commonly observed in h-RMnO 3 compounds. 24 We plotted the density of topological defects (vortices and antivortices) in PFM images vs. the cooling rate (Fig. 2e).…”

Section: Resultsmentioning

confidence: 99%

Vortex ferroelectric domains, large-loop weak ferromagnetic domains, and their decoupling in hexagonal (Lu, Sc)FeO3

Gao

Wang

et al. 2018

npj Quant Mater

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The direct domain coupling of spontaneous ferroelectric polarization and net magnetic moment can result in giant magnetoelectric (ME) coupling, which is essential to achieve mutual control and practical applications of multiferroics. Recently, the possible bulk domain coupling, the mutual control of ferroelectricity (FE) and weak ferromagnetism (WFM) have been theoretically predicted in hexagonal LuFeO 3 . Here, we report the first successful growth of highly-cleavable Sc-stabilized hexagonal Lu 0.6 Sc 0.4 FeO 3 (h-LSFO) single crystals, as well as the first visualization of their intrinsic cloverleaf pattern of vortex FE domains and large-loop WFM domains. The vortex FE domains are on the order of 0.1-1 μm in size. On the other hand, the loop WFM domains are~100 μm in size, and there exists no interlocking of FE and WFM domain walls. These strongly manifest the decoupling between FE and WFM in h-LSFO. The domain decoupling can be explained as the consequence of the structure-mediated coupling between polarization and dominant in-plane antiferromagnetic spins according to the theoretical prediction, which reveals intriguing interplays between FE, WFM, and antiferromagnetic orders in h-LSFO. Our results also indicate that the magnetic topological charge tends to be identical to the structural topological charge. This could provide new insights into the induction of direct coupling between magnetism and ferroelectricity mediated by structural distortions, which will be useful for the future applications of multiferroics.

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“…2(a)], single-crystal results show that one type of polarity is more favored than the other (type II) [50]. This behavior is likely due to a chemical, strain gradient, or self-poling effect [51] possibly originating from a large thermal gradient that exists during crystal growth using a laser-floating-zone technique. We also obtain ferroelectric hysteresis loops on single crystals with remnant polarization as high as approximately 0.9 μC=cm 2 at T ¼ 77 K, as shown in Fig.…”

Section: A Structural and Ferroelectric Propertiesmentioning

confidence: 96%

Spin Liquid State and Topological Structural Defects in Hexagonal TbInO3

et al. 2019

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We report the coexistence of ferroelectricity and a spin liquid state in hexagonal TbInO 3 with quasitwo-dimensional triangular spin lattice. Geometrical ferroelectricity associated with In trimerization accompanies topological ferroelectric structural defects. Magnetic susceptibility data show in-plane magnetic anisotropy of Tb spins without any long-range order above 1.8 K, and we also confirm no trace of any phase transition down to 0.15 K from a specific heat measurement, which indicates that this system is highly frustrated and may host a spin liquid ground state. By analyzing the Schottky anomaly in the specific heat results, we propose a model where crystal-field levels are different in each Tb sites, and only one of them has a magnetic ground state and forms a unique honeycomb spin lattice. These observations put forward an interesting possibility where spin liquid and ferroelectric behaviors coexist, and the atomically sharp ferroelectric domain walls may host new magnetic edge states or local spin excitations.

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Self-poling with oxygen off-stoichiometry in ferroelectric hexagonal manganites

Cited by 28 publications

References 36 publications

Preparation of epitaxial hexagonal YMnO3 thin films and observation of ferroelectric vortex domains

Preparation of epitaxial hexagonal YMnO3 thin films and observation of ferroelectric vortex domains

Vortex ferroelectric domains, large-loop weak ferromagnetic domains, and their decoupling in hexagonal (Lu, Sc)FeO3

Spin Liquid State and Topological Structural Defects in Hexagonal TbInO3

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