scholarly journals As-Grown Domain Structure in Calcium Orthovanadate Crystals

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1508
Author(s):  
Ekaterina Shishkina ◽  
Vladimir Yuzhakov ◽  
Maksim Nebogatikov ◽  
Elena Pelegova ◽  
Eduard Linker ◽  
...  
Keyword(s):  
Domain Structure ◽  
Domain Walls ◽  
Domain Switching ◽  
Second Harmonic ◽  
Threshold Value ◽  
Polar Component ◽  
Force Microscopy ◽  
Piezoelectric Force Microscopy ◽  
Mn Doped ◽  
Comprehensive Study

An as-grown domain structure in nominally pure and Mn-doped calcium orthovanadate (CVO) crystals was studied by several methods of domain imaging: optical microscopy, piezoelectric force microscopy, and Cherenkov-type second harmonic generation. The combination of imaging methods provided an opportunity for comprehensive study of the domain structure on the polar surface and in the bulk of the samples. It was shown that, in nominally pure CVO crystals, an irregular 3D maze of rounded domains, with charged walls, essentially tilted from the polar direction, was present. It was proposed that the domain structure was formed just below the phase transition temperature and persisted during subsequent cooling. Such behavior is due to effective bulk screening of the depolarization field and a low value of the pyroelectric field which appears during cooling. The revealed formation of triangular domains and flat fragments of domain walls in Mn-doped CVO was attributed to polarization reversal under the action of the polar component of the pyroelectric field, above the threshold value for domain switching. This fact represents the first observation of the domain switching in CVO crystals.

scholarly journals Structure and Dynamics of Ferroelectric Domains in Polycrystalline Pb(Fe1/2Nb1/2)O3

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1327 ◽  
Author(s):  
Ursic ◽  
Bencan ◽  
Prah ◽  
Dragomir ◽  
Malic
Keyword(s):  
Domain Wall ◽  
Ambient Temperature ◽  
Domain Structure ◽  
Domain Walls ◽  
Domain Switching ◽  
Piezoresponse Force Microscopy ◽  
Paraelectric Phase Transition ◽  
Force Microscopy ◽  
Ferroelectric Domains

A complex domain structure with variations in the morphology is observed at ambient temperature in monoclinic Pb(Fe1/2Nb1/2)O3. Using electron microscopy and piezoresponse force microscopy, it is possible to reveal micrometre-sized wedge, lamellar-like, and irregularly shaped domains. By increasing the temperature, the domain structure persists up to 80 °C, and then starts to disappear at around 100 °C due to the proximity of the ferroelectric–paraelectric phase transition, in agreement with macroscopic dielectric measurements. In order to understand to what degree domain switching can occur in the ceramic, the mobility of the domain walls was studied at ambient temperature. The in situ poling experiment performed using piezoresponse force microscopy resulted in an almost perfectly poled area, providing evidence that all types of domains can be easily switched. By poling half an area with 20 V and the other half with −20 V, two domains separated by a straight domain wall were created, indicating that Pb(Fe1/2Nb1/2)O3 is a promising material for domain-wall engineering.

scholarly journals Quantitative analysis of the direct piezoelectric response of bismuth ferrite films by scanning probe microscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Kento Kariya ◽  
Takeshi Yoshimura ◽  
Katsuya Ujimoto ◽  
Norifumi Fujimura
Keyword(s):  
Quantitative Analysis ◽  
Domain Structure ◽  
Scanning Probe Microscopy ◽  
Domain Walls ◽  
Piezoelectric Properties ◽  
Bismuth Ferrite ◽  
Scanning Probe ◽  
Piezoelectric Response ◽  
Probe Microscopy ◽  
Piezoelectric Force Microscopy

AbstractPolarisation domain structure is a microstructure specific to ferroelectrics and plays a role in their various fascinating characteristics. The piezoelectric properties of ferroelectrics are influenced by the domain wall contribution. This study provides a direct observation of the contribution of domain walls to the direct piezoelectric response of bismuth ferrite (BiFeO3) films, which have been widely studied as lead-free piezoelectrics. To achieve this purpose, we developed a scanning probe microscopy-based measurement technique, termed direct piezoelectric response microscopy (DPRM), to observe the domain structure of BiFeO3 films via the direct piezoelectric response. Quantitative analysis of the direct piezoelectric response obtained by DPRM, detailed analysis of the domain structure by conventional piezoelectric force microscopy, and microscopic characterisation of the direct piezoelectric properties of BiFeO3 films with different domain structures revealed that their direct piezoelectric response is enhanced by the walls between the domains of spontaneous polarisation in the same out-of-plane direction.

scholarly journals Phase engineering in oxides by interfaces

2012 ◽  
Vol 370 (1977) ◽  
pp. 4972-4988 ◽  
Author(s):  
Manfred Fiebig
Keyword(s):  
Domain Walls ◽  
Second Harmonic ◽  
Piezoresponse Force Microscopy ◽  
Bulk Crystals ◽  
Oxide Interface ◽  
Force Microscopy ◽  
Hexagonal Manganites ◽  
Phase Engineering ◽  
Protected Domain ◽  
Antiferromagnetic Domains

Optical second harmonic generation and piezoresponse force microscopy are used to investigate manifestations of ordered states directly related to the presence of an oxide interface. Three examples, each with a very different scope, are reviewed in order to highlight the richness of interface-related phenomena in oxides. (i) The orbital states involved in the emergence of an interfacial conducting state in LaAlO 3 /SrTiO 3 heterostructures are investigated, which reveal a surprising decoupling of orbital and transport properties; (ii) the distribution of ferroelectric and antiferromagnetic domains in epitaxial films of the multiferroic hexagonal manganites is investigated, which reveals striking differences to the corresponding bulk crystals; and (iii) the distribution of trimerization–polarization domains in the hexagonal manganites is investigated, which reveals the presence of topologically protected domain walls with properties different from the bulk.

Magnetic properties, domain structure, and microstructure of anisotropic SmCo6.5Zr0.5 ribbons with C addition

2001 ◽  
Vol 16 (3) ◽  
pp. 629-632 ◽  
Author(s):  
A-Ru Yan ◽  
Zhi-Gang Sun ◽  
Wen-Yong Zhang ◽  
Hong-Wei Zhang ◽  
Bao-Gen Shen
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Magnetic Force ◽  
Domain Walls ◽  
Magnetic Measurement ◽  
Scanning Electron Micrographs ◽  
X Ray Diffraction ◽  
Easy Magnetization ◽  
Force Microscopy ◽  
Ribbon Plane

The magnetic properties and the domain structure of anisotropic melt-spun SmCo6.5Zr0.5 alloys with C addition was investigated by means of x-ray diffraction (XRD), magnetic measurement, and magnetic force microscopy. The XRD analyses showed that the addition of a few percent of C led to a significant increase in the coercivity and simultaneously affected the characterization of crystalline texture of the ribbons. The easy magnetization c axis changed from parallel to the ribbon plane for SmCo6.5Zr0.5 ribbons to normal to the ribbon plane for SmCo6.5Zr0.5C0.25−0.75 ribbons. An optimal coercivity of 0.92 T was obtained for the SmCo6.5Zr0.5C0.5 ribbon spun at 5 m/s. The corresponding remanence measured normal or parallel to the ribbon plane was 7.1 kGs or 3.1 kGs, respectively. The domain structure was studied by magnetic force microscopey. A strip-shaped domain was observed on the surface of the SmCo6.5Zr0.5 ribbons and the walls lay straight and parallel. For C-doped ribbons, the domain walls formed a maze domain pattern of grains with c axis normal to the ribbon plane. Scanning electron micrographs showed that a dendrite structure was present in the SmCoZr ribbon surface, and C addition caused the above-mentioned dendrite to diminish.

Magnetic Force Microscopic Study on Domain-Wall Molecules in NiFe Nano Rings

2009 ◽  
Vol 152-153 ◽  
pp. 529-532
Author(s):  
Kohei Sasage ◽  
Naoya Okamoto ◽  
Hana Tsujikawa ◽  
Takehiro Yamaoka ◽  
Eiji Saitoh
Keyword(s):  
Magnetic Field ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Threshold Value ◽  
Magnetostatic Interaction ◽  
Stray Magnetic Field ◽  
Force Microscopy ◽  
Magnetic Domain Walls

A pair of magnetic domain walls (DWs) in ferromagnetic NiFe rings has been investigated in terms of the magnetic force microscopy (MFM). When the distance between the rings d is greater than a threshold value dth, MFM signals indicate that a DW in the ring is dragged due to a stray magnetic field from an MFM probe tip. When d < dth, this drag signals disappears; DWs are bound to each other by the DW-DW interaction. This transition can be argued in terms of the competition between the DW-DW magnetostatic interaction and the DW-drag potential. From the d-dependent MFM data, the DW-drag potential was estimated.

scholarly journals Влияние ионного облучения на магнитные свойства пленок CoPt

2021 ◽  
Vol 63 (3) ◽  
pp. 324
Author(s):  
И.Л. Калентьева ◽  
О.В. Вихрова ◽  
Ю.А. Данилов ◽  
А.В. Здоровейщев ◽  
М.В. Дорохин ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Remanent Magnetization ◽  
Domain Walls ◽  
Ion Irradiation ◽  
Electron Beam Evaporation ◽  
Force Microscopy ◽  
Circular Domains ◽  
Anti Stokes ◽  
The Magnetic Field

The possibility of using He+ ion implantation with an energy of 20 keV for modifying the domain structure and magnetic properties of CoPt films formed by electron beam evaporation with different compositions - Co0.45Pt0.55 and Co0.35Pt0.65 - has been investigated. For the irradiated CoPt samples of both compositions, a decrease in the coercivity (narrowing of the hysteresis loop on the magnetic field dependences of the Faraday angle and magnetization) with an increase in the He+ ion fluence from 2×1014 to 4×1014 cm−2 was found. In this case, the remanent magnetization of the Co0.35Pt0.65 films coincides with the value of saturation magnetization, while for Co0.45Pt0.55, a decrease in the remanent magnetization is observed. Magnetic force microscopy has shown that for the Co0.45Pt0.55 alloy, with an increase in the ion fluence up to 3 × 1014 cm−2, the largest number of isolated circular domains (skyrmions) is formed, while for He+ irradiation with a fluence of 4×1014 cm−2 for Co0.35Pt0.65, in addition to isolated circular domains, 360-degree domain walls (1D skyrmions) are observed. At the same time, the study of CoPt films by the Mandelstam-Brillouin spectroscopy method revealed an increase in the shift between the Stokes and anti-Stokes components of the spectrum and thus a significant increase of the Dzyaloshinsky-Moriya interaction for the irradiated samples. Simulation using the SRIM software showed that the applied ion irradiation causes the asymmetric mixing of Co and Pt atoms and thus, this may underlie the mechanism of the of the ion irradiation on magnetic properties and domain structure in CoPt films.

Investigation of Domain Structure of SrBi2Ta2O9 Single Crystals via Polarized Optical and Piezoelectric Force Microscopy

2004 ◽  
Vol 62 (1) ◽  
pp. 215-220 ◽  
Author(s):  
HARVEY AMORÍN ◽  
VLADIMIR V. SHVARTSMAN ◽  
GILLES TROLLIARD ◽  
MICHEL MANIER ◽  
JEAN-PIERRE MERCURIO ◽  
...  
Keyword(s):  
Single Crystals ◽  
Domain Structure ◽  
Force Microscopy ◽  
Piezoelectric Force Microscopy

scholarly journals Effect of mechanical stresses on the domain structure of barium titanate single crystals

2020 ◽  
Vol 8 (4) ◽  
pp. 66-78
Author(s):  
V. V. Borodina ◽  
S. O. Kramarov
Keyword(s):  
Barium Titanate ◽  
Single Crystals ◽  
Domain Structure ◽  
Oxygen Vacancies ◽  
Domain Walls ◽  
Domain Switching ◽  
Mechanical Load ◽  
Ferroelectric Properties ◽  
Mechanical Stresses ◽  
The Impact

This review article summarizes the material of years of research on the impact of mechanical stresses on the domain structure of multiaxhetoelectrics using the example of barium titanium monocrystals. Since the discovery of the ferroelectric properties of barium titanate in 1944, this material has been the subject of comprehensive investigation as the first practically important and perhaps the most famous ferroelectric. The domain structure of barium titanate is sensitive to mechanical stresses arising both from simple uniaxial compression and from point impacts by local mechanical loading. Mechanical stress applied to a ferroelectric crystal may have a significant effect on dielectric and piezoelectric properties. In particular, 90-degree domain switching is possible under the influence of stresses. The most interesting experimental results are obtained in the study of elastoplastic processes in BaTiO 3 originating from local mechanical stresses. The following features are found and studied: development of strained region around the point of application of the load; “internal” 90-degree domain that does not extend to the crystal surfaces and does not close upon other domains; the growth of 90-degree domains under the influence of residual mechanical stresses; growth of cracks along charged 90-degree domain walls. The notions of “ferroplastic effect” (crystal deformation due to the formation of 90-degree ferroelectric domains) and “ferromechanical effect” (crack formation and growth along charged 90-degree domain walls) are introduced. The hypothesis of a significant role of oxygen vacancies in the processes of 90-degree domain reorientation was put forward and experimentally confirmed. In particular, an increase in the concentration of oxygen vacancies by reducing annealing of barium titanate single crystals creates more favorable conditions for the appearance of an "internal" 90-degree domain under local mechanical load. The study of the mechanisms governing the formation of a domain structure in ferroelectric crystals remains an important problem of modern materials science.

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