• 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, ...
    • 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 ...
    • 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 ...
    • Shape-imposed anisotropy in antiferromagnetic complex oxide nanostructures 

      Bang, Ambjørn Dahle; Hallsteinsen, Ingrid; Chopdekar, Rajesh V.; Olsen, Fredrik Kjemperud; Slöetjes, Samuel Dingeman; Kjærnes, Kristoffer; Arenholz, Elke; Folven, Erik; Grepstad, Jostein (Journal article; Peer reviewed, 2019)
      In this study, we report on a shape-imposed magnetic anisotropy in micro- and nanostructures defined in antiferromagnetic (AF) LaFeO3 (LFO) thin films. Two distinct types of structures are investigated: embedded magnets ...
    • Tailoring the magnetic order in a supermagnetic metamaterial 

      Slöetjes, Samuel Dingeman; Urdahl, Hans Henrik; Grepstad, Jostein; Folven, Erik (Journal article; Peer reviewed, 2017)
      The emergent magnetism in close-packed assemblies of interacting superparamagnetic particles is commonly referred to as supermagnetism. The magnetic characteristics of such systems are determined by the dipolar coupling ...
    • Temperature and Orientation Dependent Exchange Coupling in Epitaxial Oxide Micromagnets 

      Lee, Michael S.; Wynn, Thomas A.; Folven, Erik; Chopdekar, Rajesh V.; Scholl, Andreas; Retterer, Scott; Grepstad, Jostein; Takamura, Yayoi (Journal article; Peer reviewed, 2017)
      Soft x-ray photoemission electron microscopy with an in situ magnetic field has been used to study the relationship between ferromagnetic and antiferromagnetic spin alignment and the switching/reversal field of epitaxial ...
    • Topological Defects and Dipolar Magnetism in Magnetic Nanostructures 

      Slöetjes, Samuel Dingeman (Doctoral theses at NTNU;2020:69, Doctoral thesis, 2020)
      In this work, magnetism in micro- and nanoscale magnetic structures has been explored. We focus on two different topics, topological defects and dipolar magnetism. As a model system for the study of interacting topological ...