Electron beam evaporation of superconductor-ferromagnet heterostructures



Bromley, D, Wright, AJ, Jones, LAH, Swallow, JEN, Beesley, T, Batty, R, Weatherup, RS, Dhanak, VR and O'Brien, L
(2022) Electron beam evaporation of superconductor-ferromagnet heterostructures. SCIENTIFIC REPORTS, 12 (1). 7786-.

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Abstract

We report on the electronic and magnetic properties of superconductor-ferromagnet heterostructures fabricated by electron beam evaporation on to unheated thermally oxidised Si substrates. Polycrystalline Nb thin films (5 to 50 nm thick) were shown to possess reliably high superconducting critical temperatures ([Formula: see text]), which correlate well with the residual resistivity ratio (RRR) of the film. These properties improved during ex-situ annealing, resulting in [Formula: see text] and [Formula: see text]RRR increases of up 2.2 K ([Formula: see text] 40% of the pre-annealed [Formula: see text]) and 0.8 ([Formula: see text] 60% of the pre-annealed RRR) respectively. Nb/Pt/Co/Pt heterostructures showed substantial perpendicular anisotropy in the ultrathin limit (≤ 2.5 nm), even in the extreme limit of Pt(0.8 nm)/Co(1 nm)/Pt(0.6 nm). These results point to the use of electron beam evaporation as route to line-of-sight deposited, low-thickness, high quality Nb-based superspintronic multilayers.

Item Type: Article
Uncontrolled Keywords: 51 Physical Sciences, 40 Engineering, 4018 Nanotechnology, 5104 Condensed Matter Physics
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 13 May 2022 07:54
Last Modified: 21 Jun 2024 08:18
DOI: 10.1038/s41598-022-11828-y
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3154714