• Antiferromagnetic Domain Structure in LaFeO3 Thin Films and Nanostructures 

      Folven, Erik (Doktoravhandlinger ved NTNU, 1503-8181; 2011:281, Doctoral thesis, 2011)
    • 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 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 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 ...
    • 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 ...
    • Large Area Patterning of Embedded Magnetic Nanostructures in Complex Oxide Thin Films 

      Mellbye, Aksel Skauge (Master thesis, 2015)
      Complex oxide materials exhibit a wide range of functional properties, making them interesting for future use in electronic and spintronic devices. Through nanopatterning of thin film structures, magnetic shape effects can ...
    • Magnetic domain configuration of (111)-oriented LaFeO3 epitaxial thin films 

      Hallsteinsen, Ingrid; Moreau, Magnus; Chopdekar, R.V.; Christiansen, Emil; Nord, Magnus Kristofer; Vullum, Per Erik; Grepstad, Jostein; Holmestad, Randi; Selbach, Sverre Magnus; Scholl, A; Arenholz, E; Folven, Erik; Tybell, Per Thomas Martin (Journal article; Peer reviewed, 2017)
      In antiferromagnetic spintronics control of the domains and corresponding spin axis orientation is crucial for devices. Here we investigate the antiferromagnetic axis in (111)-oriented LaFeO3/SrTiO3, which is coupled to ...
    • Magnetic domain formation in ultrathin complex oxide ferromagnetic/antiferromagnetic bilayers 

      Bang, Ambjørn Dahle; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Scholl, Andreas; Retterer, Scott T.; Vaz, Carlos; Tybell, Per Thomas Martin; Folven, Erik; Grepstad, Jostein (Journal article; Peer reviewed, 2018)
      In this study, we report on the magnetic domain formation in ultrathin blanket films and patterned micro- and nanostructures of ferromagnetic (FM) La0.7Sr0.3MnO3 single-layers and antiferromagnetic (AF)/ferromagnetic ...
    • Magnetic Force Microscopy of Magnetic Nanodisk Arrays at Room Temperature 

      Wang, Thorstein (Master thesis, 2019)
      De senere årene har verden opplevd en eksponentiell økning i energiforbruket relatert til informasjonsteknologi og data. Samtidig er det et intenst behov for å redusere verdenssamfunnets samlede energiforbruk. Dette gjør ...
    • Magnetic vortex dynamics in interacting micromagnets 

      Feiring, Mira Thoen (Master thesis, 2015)
      We have studied magnetic vortex oscillations in circular LSMO (lanthanum strontium manganite) disks by micromagnetic simulations. The simulations were performed using the MuMax3 software developed at the DyNaMat group ...
    • Micromagnetic modelling and magnetic force microscopy of supermagnetism in patterned nanomagnetic arrays 

      Strømberg, Anders (Master thesis, 2018)
      Advanced magnetic materials have played an important role in, and continue to pave the way for, innovative technological advancements. Modern day computers, sensors, and biomedicine would not be possible without the use ...
    • Micromagnetic Modelling of Thermally Induced Errors in Nanomagnetic Logic 

      Lee, Hanna Heggheim (Master thesis, 2018)
      Micromagnetic simulations have been used to study nanomagnet structures of La0.7Sr0.3MnO3 (LSMO) with the aim of use in nanomagnetic logic (NML). Studying the success rate of signal propagation in chains of nanomagnets has ...
    • Neel vector reorientation in ferromagnetic/antiferromagnetic complex oxide nanostructures 

      Bang, Ambjørn Dahle; Hallsteinsen, Ingrid; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Retterer, Scott T; Scholl, Andreas; Arenholz, Elke; Folven, Erik; Grepstad, Jostein (Journal article; Peer reviewed, 2019)
      In this study, we report on a temperature-driven antiferromagnetic (AF) spin reorientation transition in micro- and nanostructures of AF/ferromagnetic (FM) LaFeO3/La0.7Sr0.3MnO3 thin film bilayers. Using a combination of ...
    • Patterning and Characterization of Free-Standing Nanostructures in Magnetic Oxide Thin Films 

      Urnes, Marianne (Master thesis, 2016)
      Free-standing nanostructures consisting of lines measuring 650 nm wide and 4 mm long were produced over an area of 4x4 mm using electron beam lithography (EBL). The magnetic properties of the resulting structures was ...