Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.17: Poster

Thursday, September 8, 2022, 16:00–18:00, P4

Magnetization patterns in biaxial Fe32Co68 core-shell nanostructures with hexagonal cross-section — •Anastasiia Korniienko¹, Alexis Wartelle², Matthias Kronseder³, Michael Foerster⁴, Miguel Ángel Niño⁴, Sandra Ruiz-Gomes⁴, Muhammad Waqas Khaliq^{4, 5}, and Christian H. Back¹ — ¹Technical Univ. of Munich, Garching, Germany — ²Univ. Grenoble Alpes, Grenoble, France — ³Univ. of Regensburg, Regensburg, Germany — ⁴Alba Synchrotron Light Facility, CELLS, Barcelona, Spain — ⁵Univ. of Barcelona, Barcelona, Spain

We fabricate nanostructures with a Fe32Co68 shell on GaAs nanorods with hexagonal cross-section. Such a FeCo alloy, deposited on the (110) GaAs planes (the rod's facets), shows a thickness-dependent spin-reorientation transition [1]. At a thickness of 32 monolayers, we expect our tube walls to feature a biaxial behavior, with distinct azimuthal components of magnetization. Here we use Photoemission Electron Microscopy in combination with X-ray Magnetic Circular Dichroism (XMCD-PEEM) to image the magnetic configuration of individual nanostructures [2]. The XMCD-PEEM imaging was done at remanence, between applications of magnetic fields and for different angles between the x-rays and the tube axis. Some of our nanostructures feature a large number of unexpectedly persistent magnetic domains. We observed a switching between almost longitudinal and azimuthal magnetization for some domains, confirming system's biaxial behavior.

[1] Muermann et al., J. Appl. Phys., 103, 07B528 (2008).

[2] Wyss et al., PRB 96, 024423 (2017).