Blar i NTNU Open på forfatter "Digernes, Einar"

Viser treff 1-8 av 8

    • 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 ...

    • 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 ...

    • Magnetic Force Microscopy and Micromagnetic Simulations of Nanoscale Magnetic Structures and Modified Artificial Spin Ices 

      Langørgen, Amanda (Master thesis, 2020)
      Kunstige spinnis betegner magnetiske metamaterialer som består av koblede nanomagneter plassert i et gitter. De utgjør interessante system fordi de gir mulighet til å skreddersy magnetiske egenskaper. Videre har de et ...

    • 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 ...