A5054600482- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Acoustic Wave Resonator Technologies
- 2D Materials and Applications
- Inorganic Chemistry and Materials
- Ferroelectric and Negative Capacitance Devices
- Topological Materials and Phenomena
- Semiconductor materials and devices
- Iron-based superconductors research
- Electronic and Structural Properties of Oxides
- Organic and Molecular Conductors Research
- Theoretical and Computational Physics
- Quantum and electron transport phenomena
- Advancements in Semiconductor Devices and Circuit Design
- ZnO doping and properties
- Advanced Memory and Neural Computing
- High-pressure geophysics and materials
- Layered Double Hydroxides Synthesis and Applications
- Crystal Structures and Properties
- Inorganic Fluorides and Related Compounds
- Quantum many-body systems
Rutgers, The State University of New Jersey
2016-2025
University of Oxford
2016
Laboratoire de physique des Solides
2014
Centre National de la Recherche Scientifique
2014
Rütgers (Germany)
2014
Rutgers Sexual and Reproductive Health and Rights
2014
Université Paris-Sud
2014
Ferroelectric hafnium and zirconium oxides have undergone rapid scientific development over the last decade, pushing them to forefront of ultralow-power electronic systems. Maximizing potential application in memory devices or supercapacitors these materials requires a combined effort by community address technical limitations, which still hinder their application. Besides favorable intrinsic material properties, HfO2–ZrO2 face challenges regarding endurance, retention, wake-up effect, high...
Abstract Altermagnetism is introduced as a category of magnetic states with ‘collinear’ antiferromagnetic spins and alternating variations local structures around in such way that the symmetry allows typical ferromagnetic behaviors. Altermagnets exhibiting behaviors without any external perturbations (type-I) turn out to belong point group. Other altermagnets (type-II type-III) can have only electric current or stress, which conserve parity-time-reversal (PT) symmetry. All types themselves...
Sr3 Sn2 O7 is the first room-temperature ferroelectric Sn insulator with switchable electric polarization. The ferroelastic twin domains are observed using a polarized optical microscope. polarization hysteresis loop clearly demonstrates property. Intriguing switching kinetics through an in situ poling process dark-field transmission electron microscopy technique.
The layered perovskite Ca3-xSrxMn2O7 is shown to exhibit a switching from material exhibiting uniaxial negative positive thermal expansion as function of x. be related two closely competing phases with different symmetries. (NTE) effect maximized when the solid solution tuned closest this region phase space but switched off suddenly on passing though transition. Our results show for first time that, by understanding symmetry alone, one may achieve unprecedented chemical control unusual property.
Ca3Mn2O7 and Ca3Ti2O7 have been proposed as the prototypical hybrid improper ferroelectrics (HIFs), a significant magnetoelectric (ME) coupling in magnetic is, fact, reported theoretically experimentally. Although switchability of polarization is confirmed other non-magnetic HIFs, there no report switchable isostructural Ca3Mn2O7. We constructed phase diagram Ca3Mn2-xTixO7 through our systematic study series single crystalline (x = 0, 0.1, 1, 1.5, 2). Using transmission electron microscopy,...
Abstract Oxygen octahedral distortions, including tilts/rotations, deformations and off-centring in (layered) perovskites, have the key role their numerous functional properties. Near polar-centrosymmetric phase boundary bi-layered perovskite Ca 3− x Sr Ti 2 O 7 with ≈1, we found presence of abundant topological eight-state vortex-antivortex pairs, associated four oxygen tilts at domains another different domain walls. Our discovery opens a new revenue to unveil real-space defects possible...
Abstract Based on symmetry consideration, quasi-one-dimensional (1D) objects, relevant to numerous observables or phenomena, can be classified into eight different types. We provide various examples of each 1D type and discuss their operational similarity (SOS) relationships, which are often permutable. A number recent experimental observations, including current-induced magnetization in polar chiral conductors, non-linear Hall effect spin-polarization tunneling current ferro-rotational...
Directional non-reciprocity refers to the phenomenon where motion in one direction differs from opposite direction. This behavior is observed across various systems, such as one-way traffic and materials displaying electronic/optical directional dichroism, characterized by symmetry of velocity vectors. Magnetic toroidal moments (MTMs), which typically arise rotational spin arrangements, also possess vectors, making them inherently directionally non-reciprocal. In this paper, we examine...
We show that the spontaneous symmetry breaking in multiferroic hexagonal manganites can be chemically manipulated to yield two complementary ground states: well-known ferroelectric $P{6}_{3}cm$ and an antipolar $P\overline{3}c$ phase. Both breakings topologically protected vortex defects, with vortices dual those of ferroelectric. This duality stems from existence 12 possible angles ${\mathrm{MnO}}_{5}$ tilting, broad strain-free walls low energy spontaneously emerge through intermediate...
Abstract 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 practical applications multiferroics. Recently, the possible bulk ferroelectricity (FE) weak ferromagnetism (WFM) have been theoretically predicted hexagonal LuFeO 3 . Here, we report first successful growth highly-cleavable Sc-stabilized Lu 0.6 Sc 0.4 FeO ( h -LSFO) single crystals, as well...
Chiral magnets have recently emerged as hosts for topological spin textures and related transport phenomena, which can find use in next-generation spintronic devices. The coupling between structural chirality noncollinear magnetism is crucial the stabilization of complex structures such magnetic skyrmions. Most studies been focused on physical properties homochiral states favored by crystal growth absence long-ranged interactions domains opposite chirality. Therefore, effects high density...
Abstract Ferro-rotation (FR) phenomena—arising from intrinsic crystallographic rotational distortions—have only recently gained significant attention, despite the long-known presence of FR distortions in various compounds. Such phenomena include multiferroicity linked to helical spin order and electric field-induced optical activity. However, broader relationship between magnetic ordering remains largely unexplored poorly understood. This study delves into interplay identifies potential...
A variable-temperature and pressure single-crystal diffraction study of hybrid improper ferroelectric Sr 3 Sn 2 O 7 is reported. In combination with symmetry analysis, we reveal that the application temperature induce distinct phase transition pathways, driven by a differing response octahedral rotations to these stimuli. Contrary what has been previously predicted, observe paraelectric between 10.17(18) 12.13(14) GPa, meaning remains stable significantly higher pressures than expected.
The successful theoretical prediction and experimental demonstration of hybrid improper ferroelectricity (HIF) provides a new pathway to couple octahedral rotations, ferroelectricity, magnetism in complex materials. To enable technological applications, HIF with small coercive field is desirable. We successfully grow Sr3Sn2O7 single crystals, discover that they exhibit the smallest electric at room temperature among all known HIFs. Furthermore, we demonstate external stress can repeatedly...
The investigation of ferroic orders and their associated domain structures is essential for understanding the fundamental science ordering phenomena engineering relevant devices. Here, authors show experimentally that BaCoSiO${}_{4}$ single crystal carries all four types - polarization, magnetization, ferrorotation, toroidal moment. moment induces an off-diagonal linear magnetoelectricity, coupling between magnetization enables control magnetoelectricity with external magnetic fields.
Topological vortices with complex domains and domain walls exist in hexagonal manganites, which undergo a structural transition accompanying ferroelectric polarization trimerization. We have systematically studied the origin of two different types (type-I type-II) vortex controlled oxygen stoichiometry found that evolution between type-I type-II presence charged trimerization antiphase result from an vacancy gradient. also discovered rare phenomenon core split, appears to stem instability...
We combine Raman scattering spectroscopy and lattice dynamics calculations to reveal the fundamental excitations of intercalated metal monolayers in FexTaS2 (x = 1/4, 1/3) family materials. Both in- out-of-plane modes are identified, each which has trends that depend upon metal–metal distance, size van der Waals gap, metal-to-chalcogenide slab mass ratio. test these against response similar systems, including Cr-intercalated NbS2 RbFe(SO4)2, demonstrate monolayer both coherent tunable....
Chirality, i.e., handedness, pervades much of modern science from elementary particles, DNA-based biology to molecular chemistry; however, most the chirality-relevant materials have been based on complex molecules. Here, we report inorganic single-crystalline Ni3TeO6, forming in a corundum-related R3 structure with both chirality and polarity. These chiral Ni3TeO6 single crystals exhibit large optical specific rotation (α)—1355° dm−1 cm3 g−1. We demonstrate, for first time, that polar...
Experiments reveal the coexistence of a spin-liquid state and ferroelectricity in antiferromagnet TbInO${}_{3}$, suggesting that this material may be strong platform for studying novel edge effects spin liquids.
Layered Li2 SrNb2 O7 , an inorganic oxide in its bulk single-crystalline form, is experimentally demonstrated to exhibit multiple structural facets such as ferroelasticity, ferroelectricity, and antiferroelectricity. The transition from a room temperature (RT) centrosymmetric structure low-temperature out-of-plane ferroelectric in-plane antiferroelectric the (LT) domain configuration are unveiled TEM, piezoresponse force microscopy, polarization loop studies. also exhibits highly tunable...
Unlike what happens in conventional ferroics, the ferrorotational (FR) domain manipulation and visualization FR materials are nontrivial as they invariant under both space-inversion time-reversal operations. domains have recently been observed by using linear electrogyration (EG) effect X-ray diffraction (XRD) mapping. However, selectivity, such selective processing of direct domains, e.g., an optical microscope, would be next step to study their possible applications technology....
Abstract Ferromagnetism can be characterized by various distinct phenomena such as non-zero magnetization (inducing magnetic attraction/repulsion), diagonal piezomagnetism, nonreciprocal circular dichroism (such Faraday effect), odd-order (including linear) anomalous Hall effect, and magneto-optical Kerr effect. We identify all broken symmetries requiring each of the above phenomena, also relevant point groups (MPGs) with those symmetries. All ferromagnetic groups, for ferromagnets,...