Journal
PHYSICAL REVIEW B
Volume 92, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.180510
Keywords
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Funding
- ERC Advanced Investigator Grant (Superspin)
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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 by an effective exchange field (H-0) from the GdN. The splitting increases linearly, with applied field (H-ext) enabling the relative sign of H-0 and H-ext to be determined. We show that the short NbN coherence length concentrates H-0 at the NbN/GdN interface and eliminates any averaging over the GdN domain structure leading to a large zero-field splitting.
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