Browsing NTNU Open by Author "Meier, Dennis Gerhard"

Now showing items 1-20 of 26

    • Application of a long short-term memory for deconvoluting conductance contributions at charged ferroelectric domain walls 

      Holstad, Theodor Secanell; Ræder, Trygve Magnus; Evans, Donald; Småbråten, Didrik Rene; Krohns, Stephan; Schaab, Jakob; Yan, Zewu; Bourret, Edith; Helvoort, Antonius T. J. van; Grande, Tor; Selbach, Sverre Magnus; Agar, Joshua; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2020)
      Ferroelectric domain walls are promising quasi-2D structures that can be leveraged for miniaturization of electronics components and new mechanisms to control electronic signals at the nanoscale. Despite the significant ...

    • Characterization of ferroelectric domain walls by scanning electron microscopy 

      Hunnestad, Kasper; Roede, Erik Dobloug; Helvoort, Antonius T. J. van; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2020)
      Ferroelectric domain walls are a completely new type of functional interface, which have the potential to revolutionize nanotechnology. In addition to the emergent phenomena at domain walls, they are spatially mobile and ...

    • Conductivity Contrast and Tunneling Charge Transport in the Vortexlike Ferroelectric Domain Patterns of Multiferroic Hexagonal YMnO3 

      Ruff, E.; Krohns, S.; Lilienblum, M.; Meier, Dennis Gerhard; Fiebig, Manfred; Lunkenheimer, Peter; Loidl, Alois (Journal article, 2017)
      We deduce the intrinsic conductivity properties of the ferroelectric domain walls around the topologically protected domain vortex cores in multiferroic YMnO3. This is achieved by performing a careful equivalent-circuit ...

    • Contact-free reversible switching of improper ferroelectric domains by electron and ion irradiation 

      Roede, Erik Dobloug; Mosberg, Aleksander B.; Evans, Donald M.; Bourret, Edith; Yan, Zewu; Helvoort, Antonius T. J. van; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2021)
      Focused ion beam (FIB) and scanning electron microscopy (SEM) are used to reversibly switch improper ferroelectric domains in the hexagonal manganite ErMnO3. Surface charging is achieved by local ion (positive charging) ...

    • Detection of Topological Spin Textures via Nonlinear Magnetic Responses 

      Stepanova, Mariia; Masell, Jan; Lysne, Erik Nikolai; Schoenherr, Peggy; Köhler, Laura; Paulsen, Michael; Qaiumzadeh Javinani, Alireza; Kanazawa, Naoya; Rosch, Achim; Tokura, Yoshinori; Brataas, Arne; Garst, Markus; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2021)
      Topologically nontrivial spin textures, such as skyrmions and dislocations, display emergent electrodynamics and can be moved by spin currents over macroscopic distances. These unique properties and their nanoscale size ...

    • Detection of Topological Spin Textures via Nonlinear Magnetic Responses 

      Stepanova, Mariia; Masell, Jan; Lysne, Erik; Schoenherr, Peggy; Köhler, Laura; Paulsen, Michael; Qaiumzadeh Javinani, Alireza; Kanazawa, Naoya; Rosch, Achim; Tokura, Yoshinori; Brataas, Arne; Garst, Markus; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2022)
      Topologically nontrivial spin textures, such as skyrmions and dislocations, display emergent electrodynamics and can be moved by spin currents over macroscopic distances. These unique properties and their nanoscale size ...

    • Dimensionality-induced change in topological order in multiferroic oxide superlattices 

      Holtz, Megan, E.; Padgett, Elliot S.; Steinhardt, Rachel; Brooks, Charles M.; Meier, Dennis Gerhard; Schlom, Darrell G.; Muller, David A.; Mundy, Julia A. (Peer reviewed; Journal article, 2021)
      We construct ferroelectric ðLuFeO3Þm=ðLuFe2O4Þ superlattices with varying index m to study the effect of confinement on topological defects. We observe a thickness-dependent transition from neutral to charged domain walls ...

    • Dislocation-Driven Relaxation Processes at the Conical to Helical Phase Transition in FeGe 

      Schoenherr, Peggy; Stepanova, Mariia; Lysne, Erik Nikolai; Kanazawa, Naoya; Tokura, Yoshinori; Bergman, Anders; Meier, Dennis Gerhard (Journal article, 2021)
      The formation of topological spin textures at the nanoscale has a significant impact on the long-range order and dynamical response of magnetic materials. We study the relaxation mechanisms at the conical-to-helical phase ...

    • Domain Engineering in Polycrystalline ErMnO3 Using Strain- and Electrical Fields 

      Sandvik, Olav Wadseth (Master thesis, 2022)
      Utforming av ferroelektriske domener er avgjørende for å bruke ferroelektriske materialer som elektroniske komponenter, eksempelvis kondensatorer, sensorer og transdusere. For tiden kan ferroelektriske domener kontrolleres ...

    • Domain imaging of multiferroic K3Nb3B2O12 by transmission electron microscopy 

      Ryggetangen, Oskar (Master thesis, 2021)
      En forutsetning for anvendelser av ferroiske forbindelser i funksjonelle apparater på nanoskala er avbildning og karakterisering av deres domenestrukturer. Denne avhandlingen presenterer resultatene av den første studien ...

    • Domain-wall engineering and topological defects in ferroelectric and ferroelastic materials 

      Nataf, Guillaume; Gregg, J Marty; Meier, Dennis Gerhard; Hlinka, Jiri; Salje, Ekhard K. H. (Journal article, 2020)
      Ferroelectric and ferroelastic domain walls are 2D topological defects with thicknesses approaching the unit cell level. When this spatial confinement is combined with observations of emergent functional properties, such ...

    • Domains and domain walls in multiferroics 

      Evans, Donald; Garcia, Vincent; Meier, Dennis Gerhard; Bibes, Manuel (Journal article, 2020)
      Multiferroics are materials combining several ferroic orders, such as ferroelectricity, ferro- (or antiferro-) magnetism, ferroelasticity and ferrotoroidicity. They are of interest both from a fundamental perspective, as ...

    • Ferroelectric domain walls for nanotechnology 

      Meier, Dennis Gerhard; Selbach, Sverre Magnus (Journal article, 2021)
      Ferroelectric domain walls have emerged as a new type of interface in which the dynamic characteristics of ferroelectricity introduce the element of spatial mobility, allowing real-time adjustment of position, density and ...

    • Functional electronic inversion layers at ferroelectric domain walls 

      Mundy, Julia; Schaab, Jakob; Kumagai, Yu; Cano, Andres; Stengel, Massimiliano; Krug, Ingo P.; Gottlob, Daniel G.; Doganay, Hattice; Holtz, Megan, E.; Held, Rainer; Yan, Zewu; Bourret, Edith; Schneider, Claus M.; Schlom, Darrel G.; Muller, David A.; Ramesh, Ramamoorthy; Spaldin, Nicola A.; Meier, Dennis Gerhard (Journal article; Peer reviewed, 2017)
      Ferroelectric domain walls hold great promise as functional two-dimensional materials because of their unusual electronic properties. Particularly intriguing are the so-called charged walls where a polarity mismatch causes ...

    • Insulating improper ferroelectric domain walls as robust barrier layer capacitors 

      Puntigam, Lukas; Schultheiss, Jan; Strinic, Ana; Yan, Zewu; Bourret, Edith; Altthaler, Markus; Keszmarki, Istvan; Evans, Donald; Meier, Dennis Gerhard; Krohns, Stephan (Peer reviewed; Journal article, 2021)
      We report the dielectric properties of improper ferroelectric hexagonal (h-)ErMnO3. From the bulk characterization, we observe a temperature and frequency range with two distinct relaxation-like features, leading to high ...

    • Intrinsic and extrinsic conduction contributions at nominally neutral domain walls in hexagonal manganites 

      Schultheiß, Jan; Schaab, Jakob; Småbråten, Didrik Rene; Skjærvø, Sandra Helen; Bourret, Edith; Yan, Zewu; Selbach, Sverre Magnus; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2020)
      Conductive and electrostatic atomic force microscopy (cAFM and EFM) are used to investigate the electric conduction at nominally neutral domain walls in hexagonal manganites. The EFM measurements reveal a propensity of ...

    • Local control of improper ferroelectric domains in YMnO 3 

      Kuerten, Lukas; Krohns, Stephan; Schoenherr, Peggy; Holeczek, Katharina; Pomjakushina, Ekaterina; Lottermoser, Thomas; Trassin, Morgan; Meier, Dennis Gerhard; Fiebig, Manfred (Peer reviewed; Journal article, 2020)
      Improper ferroelectrics are described by two order parameters: a primary one, driving a transition to long-range distortive, magnetic, or otherwise nonelectric order, and the electric polarization, which is induced by the ...

    • Local electric-field control of multiferroic spin-spiral domains in TbMnO3 

      Schoenherr, Peggy; Manz, Sebastian; Kuerten, Lukas; Shapovalov, Konstantin; Iyama, Ayato; Kimura, Tsuyoshi; Fiebig, Manfred; Meier, Dennis Gerhard (Journal article, 2020)
      Spin-spiral multiferroics exhibit a magnetoelectric coupling effects, leading to the formation of hybrid domains with inseparably entangled ferroelectric and antiferromagnetic order parameters. Due to this strong magnetoelectric ...

    • Magnetic and geometric control of spin textures in the itinerant kagome magnet Fe3 Sn2 

      Altthaler, Markus; Lysne, Erik Nikolai; Roede, Erik Dobloug; Prodan, Lilian; Tsurkan, Vladimir; Kassem, Mohamed A.; Nakamura, Hiroyuki; Krohns, Stephan; Kézsmárki, István; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2021)
      Magnetic materials with competing magnetocrystalline anisotropy and dipolar energies can develop a wide range of domain patterns, including classical stripe domains, domain branching, and topologically trivial and nontrivial ...

    • Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate 

      Bak, Ohheum; Holstad, Theodor Secanell; Lu, Haidong; Evans, Donald; Hunnestad, Kasper Aas; Wang, Bo; Becker, Petra; Bohatý, Ladislav; Helvoort, Antonius T. J. van; Gregg, J Marty; Meier, Dennis Gerhard; Gruverman, Alexei (Peer reviewed; Journal article, 2020)
      Application of scanning probe microscopy techniques such as piezoresponse force microscopy (PFM) opens the possibility to re‐visit the ferroelectrics previously studied by the macroscopic electrical testing methods and ...