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

Avradeep Pal; M. G. Blamire

doi:10.1103/PhysRevB.92.180510

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

Avradeep Pal, M. G. Blamire

DOI 10.1103/PhysRevB.92.180510 · Physical Review B

T1

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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 by an effective exchange field (H0) from the GdN. The splitting increases linearly, with applied field (Hext) enabling the relative sign of H0 and Hext 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown