Penetration depth of Cooper pairs in the IrMn antiferromagnet
BUZDIN, A. I.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Sechenov First Moscow State Medical University
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Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Sechenov First Moscow State Medical University
Idioma
en
Article de revue
Este ítem está publicado en
Physical Review B. 2021, vol. 104, p. 054413
American Physical Society
Resumen en inglés
Suppression of superconductivity due to the proximity effect between a superconductor and a ferromagnet can be partially alleviated when a Cooper pair simultaneously samples different directions of the short-range exchange ...Leer más >
Suppression of superconductivity due to the proximity effect between a superconductor and a ferromagnet can be partially alleviated when a Cooper pair simultaneously samples different directions of the short-range exchange field. The superconductor's critical temperature, TC, is therefore expected to partially recover when the ferromagnet is in a multi-domain state, as opposed to a single-domain state. Here, we discuss series of experiments performed with ferromagnet(Pt/Co)/spacer(IrMn and Pt)/superconductor(NbN) heterostructures. By tuning the various parameters in play, e.g., superconducting coherence length-to-thicknesses ratio, and domain sizes, we obtained up to 10% recovery of the superconducting critical temperature ΔTC/TC. This large-scale recovery made novel investigations possible. In particular, from the spacer thickness-dependence of ΔTC/TC, it was possible to deduce the characteristic length for Cooper pair penetration in an IrMn antiferromagnet. This information is crucial for electronic transport, and up to now has been difficult to access experimentally for antiferromagnets.< Leer menos
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