Blar i NTNU Open på forfatter "Folven, Erik"

Viser treff 1-20 av 42

    • Anisotropy and domain formation in a dipolar magnetic metamaterial 

      Digernes, Einar Standal; Strømberg, Anders; Vaz, Carlos A. F.; Kleibert, Armin; Grepstad, Jostein; Folven, Erik (Journal article; Peer reviewed, 2021)

    • Antiferromagnetic Domain Structure in LaFeO3 Thin Films and Nanostructures 

      Folven, Erik (Doktoravhandlinger ved NTNU, 1503-8181; 2011:281, Doctoral thesis, 2011)

    • Clocked dynamics in artificial spin ice 

      Jensen, Johannes Høydahl; Strømberg, Anders; Breivik, Ida; Penty, Arthur George; Nino, Miguel Angel; Khaliq, Muhammad Waqas; Foerster, Michael; Tufte, Gunnar; Folven, Erik (Peer reviewed; Journal article, 2024)
      Artificial spin ice (ASI) are nanomagnetic metamaterials with a wide range of emergent properties. Through local interactions, the magnetization of the nanomagnets self-organize into extended magnetic domains. However, ...

    • Coexisting spin-flop coupling and exchange bias in LaFeO3/La0.7Sr0.3MnO3 heterostructures 

      Olsen, Fredrik Kjemperud; Hallsteinsen, Ingrid; Arenholtz, Elke; Tybell, Per Thomas Martin; Folven, Erik (Journal article; Peer reviewed, 2019)
      Exchange bias occurs in field-cooled antiferromagnet/ferromagnet systems and can most often be explained in terms of uncompensated magnetic moments at the interface that are pinned in their orientation during field cooling. ...

    • Controlling magnetic properties of La_0.7Sr_0.3MnO_3 by interface coupling and nanopatterning 

      Olsen, Fredrik Kjemperud (Doctoral theses at NTNU;2021:191, Doctoral thesis, 2021)

    • Controlling the switching field in nanomagnets by means of domain-engineered antiferromagnets 

      Folven, Erik; Linder, Jacob; Gomonay, Helen V.; Scholl, Andreas; Doran, Andrew; Young, Anthony; Retterer, Scott; Malik, V.K.; Tybell, Per Thomas Martin; Takamura, Yayoi; Grepstad, Jostein (Journal article, 2015)
      Using soft x-ray spectromicroscopy, we investigate the magnetic domain structure in embedded nanomagnets defined in La0.7Sr0.3MnO3 thin films and LaFeO3/La0.7Sr0.3MnO3 bilayers. We find that shape-controlled antiferromagnetic ...

    • Crystalline symmetry controlled magnetic switching in epitaxial (111) La0.7Sr0.3MnO3 thin films 

      Hallsteinsen, Ingrid; Folven, Erik; Olsen, Fredrik Kjemperud; Chopdekar, R.V.; Rzchowski, M; Eom, C.B.; Grepstad, Jostein; Tybell, Per Thomas Martin (Journal article; Peer reviewed, 2015)
      Mixed-valence manganite thin films are attractive for spintronic devices. Crystalline orientation is a promising route to tailor switching mechanisms, as magnetization reversal depends on the magnetic anisotropy. Here, ...

    • Direct imaging of long-range ferromagnetic and antiferromagnetic order in a dipolar metamaterial 

      Digernes, Einar; Slöetjes, Samuel Dingeman; Strømberg, Anders; Bang, Ambjørn Dahle; Olsen, Fredrik Kjemperud; Arenholz, Elke; Chopdekar, Rajesh V.; Grepstad, Jostein; Folven, Erik (Journal article, 2020)
      Magnetic metamaterials such as artificial spin ice offer a route to tailor magnetic properties. Such materials can be fabricated by lithographically defining arrays of nanoscale magnetic islands. The magnetostatic interactions ...

    • Direct observation of temperature dependent vortex dynamics in a La0.7Sr0.3MnO3 micromagnet 

      Digernes, Einar; Leliaert, Jonathan; Weigand, Markus; Folven, Erik; Van Waeyenberge, Bartel (Peer reviewed; Journal article, 2020)
      Although it is well documented that the vortex core in a micromagnet can switch polarization in response to magnetic field pulses, the temperature dependence of this process has not yet been addressed by experiments. Using ...

    • Effects of array shape and disk ellipticity in dipolar-coupled magnetic metamaterials 

      Slöetjes, Samuel Dingeman; Digernes, Einar; Strømberg, Anders; Olsen, Fredrik Kjemperud; Bang, Ambjørn Dahle; N'diaye, Alpha T; Chopdekar, Rajesh V.; Folven, Erik; Grepstad, Jostein (Peer reviewed; Journal article, 2021)
      Two-dimensional lattices of dipolar-coupled thin film ferromagnetic nanodisks give rise to emergent superferromagnetic (SFM) order when the spacing between dots becomes sufficiently small. In this paper, we define micron-sized ...

    • Effects of lattice geometry on the dynamic properties of dipolar-coupled magnetic nanodisk arrays 

      Slöetjes, Samuel Dingeman; Digernes, Einar; Klewe, Christoph; Shafer, Padraic; Li, Qian; Yang, M.; Qiu, Z.Q.; N'diaye, Alpha T; Arenholz, Elke; Folven, Erik; Grepstad, Jostein (Journal article; Peer reviewed, 2019)
      We have studied the impact of lattice geometry on the dynamic properties of close-spaced arrays of circular nanomagnets, also known as magnonic crystals. To this end, we prepared 2D nanomagnet arrays with both square and ...

    • Enhanced magnetic signal along edges of embedded epitaxial La0.7Sr0.3MnO3 nanostructures 

      Olsen, Fredrik Kjemperud; Bang, Ambjørn Dahle; Digernes, Einar; Slöetjes, Samuel Dingeman; Andreas, Scholl; Chopdekar, Rajesh V.; Tybell, Per Thomas Martin; Grepstad, Jostein; Folven, Erik (Peer reviewed; Journal article, 2020)
      When thin films are patterned to realize nanoscale device geometries, maintaining their structural integrity is key to the quality of their functional properties. The introduction of new surfaces and interfaces by lateral ...

    • Exchange explosions of topological edge defects in a square micromagnet 

      Slöetjes, Samuel Dingeman; Folven, Erik; Grepstad, Jostein (Peer reviewed; Journal article, 2020)
      ) with a flux-closure magnetic ground state were investigated by micromagnetic simulations. The system was excited with an applied magnetic field, displacing the vortex core sufficiently far from its equilibrium position ...

    • Exploring supermagnetism in patterned thin films of La0.7Sr0.3MnO3 

      Urdahl, Hans Henrik S (Master thesis, 2016)
      Supermagnetism refers to the collective magnetic ordering of superparamagnetic nanoparticles. The phenomenon may be used to engineer novel magnetic materials. To investigate how supermagnetism may be manifest in patterned ...

    • Fabrication and Characterisation of an on-chip Microheater for artificial spin ices 

      Amundsen, Christopher (Master thesis, 2023)
      Kunstige spinnis er et magnetisk metamateriale som består av vekselvirkende nanomagneter arrangert i spesielle geometrier. Slike systemer har kompleks dynamikk og egenskaper man ofte ser i databehandlingssystemer [1]. ...

    • Fabrication of Large Area Artificial Spin Ice Systems 

      Stalsberg, Marte Pedersen (Master thesis, 2021)
      Artificial spin ice (ASI) er en type konstruerte materialer, bestående av magneter av nanostørrelse som har fått mye oppmerksomhet det siste tiåret. Fordi vekselvirkninger mellom nanomagnetene skaper magnetisk frustrasjon ...

    • Fabrication of Supermagnetic Metamaterials 

      Rosvoll, Susanne (Master thesis, 2021)
      De siste årene har studier innen magnetiske metamaterialer funnet tegn på supermagnetisme i enkelte magnetsystemer, noe som gjør feltet attraktivt både for forskning og framtidig teknologi. For å muliggjøre bruken av disse ...

    • Flatspin: A large-scale artificial spin ice simulator 

      Jensen, Johannes Høydahl; Strømberg, Anders; Lykkebø, Odd Rune Strømmen; Penty, Arthur George; Lealiaert, Jonathan; Själander, Magnus; Folven, Erik; Tufte, Gunnar (Journal article; Peer reviewed, 2022)
      We present flatspin, a novel simulator for systems of interacting mesoscopic spins on a lattice, also known as artificial spin ice (ASI). A generalization of the Stoner-Wohlfarth model is introduced, and combined with a ...

    • Interplay between bulk and edge-bound topological defects in a square micromagnet 

      Slöetjes, Samuel Dingeman; Digernes, Einar; Olsen, Fredrik Kjemperud; Chopdekar, Rajesh V.; Retterer, Scott T.; Folven, Erik; Grepstad, Jostein (Journal article; Peer reviewed, 2018)
      A field-driven transformation of a domain pattern in a square micromagnet, defined in a thin film of La0.7Sr0.3MnO3, is discussed in terms of creation and annihilation of bulk vortices and edge-bound topological defects ...

    • Investigating domains in modified square artificial spin ice using magnetic force microscopy and simulations 

      Holm, Gunvor (Master thesis, 2023)
      Kunstige spinn-is er magnetiske metamaterialer med unike emergente egenskaper, som gjør de til gode kandidater for nye typer datamaskiner. Å forstå mer av oppførselen til disse materialene er essensielt for å utvikle de ...