SKM 2023 – scientific programme

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DS: Fachverband Dünne Schichten

DS 12: Poster

DS 12.49: Poster

Wednesday, March 29, 2023, 17:00–19:00, P3

Growth of CoO Thin Films for Application in Superconductor - Magnet Heterostructures — •Amy McGlinchey — Trinity College Dublin, Ireland

Cobalt monoxide, CoO, is an antiferromagnet (AF) with a Néel temperature of 293K. It is utilised to pin the magnetisation of Co layers via exchange bias and is employed in magnetic heterostructures. The interaction between ferromagnet (F) and AF layers is predicted to generate long-range spin-triplet superconductivity in F-S-AF heterostructures [1]. CoO is a good candidate for the AF due to its low Néel temperature, which facilitates in-field cooling through the transition improving magnetic homogeneity. For the most part, CoO is synthesized by the oxidation of Co thin films or using techniques such as spray pyrolysis and pulsed laser deposition. In this work, we focus on the growth of CoO by molecular beam epitaxy, investigating the crystalline quality of the CoO as a function of deposition conditions. We have optimised these conditions to grow single crystalline CoO(100) thin films on MgO(100) substrates. As a second step towards a F-S-AF heterostructure, we also investigate the superconducting properties of Nb grown on CoO films. Due to the proximity effect, the properties of the niobium - especially at low thickness relevant to heterostructures - will be influenced by the CoO magnetic and interface structure [2]. 1. L. G. Johnsen et al., Phys. Rev. B, 103, L060505 (2021). 2. G. A. Bobkov et al., Phys. Rev. B, 106, 144512 (2022).