Stefan G. Ebbinghaus

Martin Luther University Halle-Wittenberg

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Armin Reller

University of Augsburg

Anke Weidenkaff

Technical University of Darmstadt

Roberto Köferstein

Martin Luther University Halle-Wittenberg

A. Loidl

University of Augsburg

Christian Näther

Kiel University

Till Walther

Martin Luther University Halle-Wittenberg

Stefan Riegg

Technical University of Darmstadt

Robert E. Dinnebier

Max Planck Institute for Solid State Research

Tomče Runčevski

Southern Methodist University

Susanne Wöhlert

Kiel University

Cooperative Institutions

Martin Luther University Halle-Wittenberg

University of Augsburg

Augsburg University

Swiss Federal Laboratories for Materials Science and Technology

Leipzig University

Max Planck Society

Centre National de la Recherche Scientifique

Luther University

University of Stuttgart

Karlsruhe Institute of Technology

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Nanoscale Resistive Switching in Ultrathin PbZr_0.2Ti_0.8O₃–La_0.7Sr_0.3MnO₃ Bilayer

physica status solidi (b) (2020)

Tino Band Diana Rata R.S. Roth Stefan G. Ebbinghaus Kathrin Dörr

Electric switching of ultrathin ferroelectric films is vital for electronic elements such as multiferroic tunnel junctions, but the large required field may induce ionic motions as addressed here. Unipolar current–voltage ( I–V ) characteristics of ultrathin (3 nm) PbZr 0.2 Ti 0.8 O 3 (PZT) grown on La 0.7 Sr 0.3 MnO 3 (LSMO) by pulsed laser deposition have been investigated in an ambient‐condition force microscope. Topographic changes have been recorded after the I–V measurements. No ferroelectric switching is found, but resistive switching with features in agreement with earlier work on similar perovskite titanates. The onset of hysteretical I–V loops is correlated with a clear height increase in the contacted area under the Pt‐covered tip. The onset voltage of 4.5 V (−2.5 V) for positive (negative) tip bias is clearly different for the two voltage polarities. The observed height changes after applying electrical voltage reveal a volume expansion that must be attributed to chemical changes in both the PZT and the LSMO layers. A fast and a slow process of ionic motion or electrochemical reaction contributing to the observed features is identified. The slow one occurs at negative voltage, causes very large height increase, and is hypothetically attributed to processes following the electro‐splitting of the adsorbed surface water.

Pulsed Laser Deposition

Hysteresis

Deposition

Piezoresponse force microscopy

Biasing

Resistive touchscreen

10.1002/pssb.201900609

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Citations (3)

On the magnetism of Ln2/3Cu3Ti4O12 (Ln = lanthanide)

The European Physical Journal B (2011)

A. Dittl S. Krohns J. Sebald F. Schrettle M. Hemmida

Magnetism

Lanthanide contraction

Dysprosium

Lattice constant

10.1140/epjb/e2010-10796-1

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Citations (27)

Erratum: “Broadband dielectric spectroscopy on single-crystalline and ceramic CaCu3Ti4O12” [Appl. Phys. Lett. 91, 022910 (2007)]

Applied Physics Letters (2007)

S. Krohns P. Lunkenheimer Stefan G. Ebbinghaus A. Loidl

First Page

10.1063/1.2795076

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Citations (18)

BaGeo 3 as Sintering Additive for BaTiO 3 –MgFe 2 O 4 Composite Ceramics

SSRN Electronic Journal (2015)

Roberto Köferstein Stefan G. Ebbinghaus

BaTiO3–MgFe2O4 composites (30 wt% MgFe2O4) with a small addition of BaGeO3 as a sintering additive were synthesized by a one-pot Pechini-like sol–gel process. Nano-crystalline composite powders with a crystallite size of about 10 nm were obtained after reaction at 700 C for 1 h. Magnetic investigations suggest that the nano-powder is in its superparamagnetic state at room temperature. The addition of BaGeO3 leads to an improved sintering behaviour. DTA measurements reveal the formation of a liquid phase at 1164(3) °C. Dense ceramic bodies (relative density $ 90%) were obtained after sintering for 1 h at 1150 °C. SEM investigations prove a 0–3 connectivity and show that the addition of BaGeO3 promotes the grain growth leading to particles up to 4 mm. In contrast, fine-grained composite ceramics with smaller particles up to 230 nm were obtained after a two-step sintering process. Magnetic measurements indicate a ferrimagnetic behaviour with coercivity values up to 70 Oe depending on the sintering procedure. Furthermore, addition of BaGeO3 results in an increase of the relative permittivity, whereas the dissipation factor slightly decreases.

Relative density

Superparamagnetism

Ferrimagnetism

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Citations (2)

Characterization of ferroelectric domains in magnetite (Fe3O4)

Applied Physics Letters (2024)

Samuel D. Seddon A.G. Cooper T. Fricke Stefan G. Ebbinghaus Marc Walker

Magnetite has long been investigated across many disciplines due to the interplay between its ferroic order parameters, namely, its ferrimagnetism, ferroelasticity, and ferroelectricity. Despite this, the experimental difficulty in measuring low temperature real space images of the ferroelectric domains has meant that the local behavior of ferroelectric domains emergent below the ∼38 K phase transition have yet to be realized. This work presents real space images of the ferroelectric domains and uses piezoresponse force microscopy as a function of temperature to probe the onset of piezoelectricity and ferroelectricity across the 38 K transition.

Piezoresponse force microscopy

Ferroelasticity

Ferrimagnetism

Characterization

Hysteresis

10.1063/5.0184338

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Citations (3)

A solution-based approach to composite dielectric films of surface functionalized CaCu₃Ti₄O₁₂ and P(VDF-HFP)

Journal of Materials Chemistry A (2013)

Claudia Ehrhardt Christian Fettkenhauer Jens Glenneberg Wolfram Münchgesang Hartmut S. Leipner

Composite thin films of surface functionalized CaCu₃Ti₄O₁₂ prepared by spin-coating show a fivefold increase of the relative permittivity compared to the pure P(VDF-HFP) polymer.

Spin Coating

10.1039/c3ta14379a

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Citations (32)

High-temperature thermoelectric properties of Sr2RuYO6 and Sr2RuErO6 double perovskites influenced by structure and microstructure

Acta Materialia (2008)

Myriam H. Aguirre Dmitry Logvinovich Laura Bocher Rosa Robert Stefan G. Ebbinghaus

Monoclinic crystal system

Atmospheric temperature range

Texture (cosmology)

10.1016/j.actamat.2008.09.003

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Citations (43)

On the incorporation of iron into hexagonal barium titanate: II. Magnetic moment, electron paramagnetic resonance (EPR) and optical transmission

Journal of Physics Condensed Matter (2020)

H. T. Langhammer Till Walther R. Böttcher Stefan G. Ebbinghaus

Systematic measurements of the magnetic moment in dependence on temperature and magnetic field of hexagonal 6H-BaTiO

10.1088/1361-648x/ab9345

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Citations (2)

CCDC 1401784: Experimental Crystal Structure Determination

The Cambridge Structural Database (2015)

Julia Werner Z. Tomkowicz Michał Rams Stefan G. Ebbinghaus Tristan Neumann

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc1j1nv2

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Citations (0)

Preparation and characterization of nanosized magnesium ferrite powders by a starch-gel process and corresponding ceramics

Journal of Materials Science (2013)

Roberto Köferstein Till Walther Dietrich Hesse Stefan G. Ebbinghaus

Superparamagnetism

10.1007/s10853-013-7447-x

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Citations (84)