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Large interfacial exchange fields in a thick superconducting film coupled to a spin-filter tunnel barrier


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Authors

Pal, A 
Blamire, MG 

Abstract

The differential conductance of NbN/GdN/TiN superconductor / ferromagnetic insulator / normal metal junctions, with a thick NbN layer shows a large zero-field voltage offset interpreted as a spin-filtered Zeeman splitting of the NbN density of states (DOS) by an effective exchange field (H₀) from the GdN. The splitting increases linearly with applied field (H_ext) enabling the relative sign of H₀ and H_ext to be determined. We show that the short NbN coherence length concentrates H₀ at the NbN/GdN interface and eliminates any averaging over the GdN domain structure leading to a large zero-field splitting.

Description

Keywords

51 Physical Sciences, 5104 Condensed Matter Physics

Journal Title

Physical Review B - Condensed Matter and Materials Physics

Conference Name

Journal ISSN

1098-0121
1550-235X

Volume Title

92

Publisher

American Physical Society (APS)
Sponsorship
This work was supported by the ERC Advanced Investigator Grant (Superspin).