Holographic vector field electron tomography of three-dimensional nanomagnets

Daniel Wolf 1 Nicolas Biziere 2 Sebastian Sturm 1 David Reyes 3 Travis Wade 4 Tore Niermann 5 Jonas Krehl 1 Bénédicte Warot-Fonrose 6 Bernd Büchner 1 Etienne Snoeck 6 Christophe Gatel 6 Axel Lubk 1
1 IFW Dresden - Leibniz Institute for Solid State and Materials Research
2 CEMES-MEM - Matériaux et dispositifs pour l'Electronique et le Magnétisme
CEMES - Centre d'élaboration de matériaux et d'études structurales
3 CEMES - Centre d'élaboration de matériaux et d'études structurales
4 LSI - Laboratoire des Solides Irradiés
5 TUB - Technische Universität Berlin
6 CEMES-I3EM - Interférométrie, In situ et Instrumentation pour la Microscopie Electronique
CEMES - Centre d'élaboration de matériaux et d'études structurales
Abstract : Complex 3D magnetic textures in nanomagnets exhibit rich physical properties, e.g., in their dynamic interaction with external fields and currents, and play an increasing role for current technological challenges such as energy-efficient memory devices. To study these magnetic nanostructures including their dependency on geometry, composition, and crystallinity, a 3D characterization of the magnetic field with nanometer spatial resolution is indispensable. Here we show how holographic vector field electron tomography can reconstruct all three components of magnetic induction as well as the electrostatic potential of a Co/Cu nanowire with sub 10 nm spatial resolution. We address the workflow from acquisition, via image alignment to holographic and tomographic reconstruction. Combining the obtained tomographic data with micromagnetic considerations, we derive local key magnetic characteristics, such as magnetization current or exchange stiffness, and demonstrate how magnetization configurations, such as vortex states in the Co-disks, depend on small structural variations of the as-grown nanowire.
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Daniel Wolf, Nicolas Biziere, Sebastian Sturm, David Reyes, Travis Wade, et al.. Holographic vector field electron tomography of three-dimensional nanomagnets. Communications Physics, 2019, 2 (1), ⟨10.1038/s42005-019-0187-8⟩. ⟨hal-02267703⟩

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