Browsing NTNU Open by Author "Grepstad, Jostein"

Now showing items 21-27 of 27

    • 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 ...

    • 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 ...