Superconducting magnetoresistance in Co/Nb/Co trilayers optimized through matching the involved length scales of the ferromagnet and superconductor

Aristomenopoulou, E.; Zeibekis, M; Σταμόπουλος, Δ.

doi:10.1016/j.jallcom.2015.12.252

Cited by 1 publication

(1 citation statement)

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“…The well known phenom enon of domain wall (DW) superconductivity, in which a lower average exchange field is experienced by Cooper pairs along the DWs, could account for some of these observations. Nonetheless, the explanations that are most con sistently put forward deal with the influence of magnetostatic stray fields [3,9,17]. An increase of the internal magnetic field (B in ) in the superconducting layer and enhanced move ment of vortex lines during transport are among the proposed effects of the appearance of these fields; both of which have been alternatively suggested as viable causes for stray field induced variations in resistance.…”

Section: Introductionmentioning

confidence: 99%

Internal flux dynamics and stray field-mediated coupling in the AC susceptibility response of Nb/Ni thin-film bilayers

Badilla¹,

Cornejo²

2018

J. Phys. D: Appl. Phys.

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The inphase ac magnetic susceptibility (X′) of Nb/Ni bilayers was measured using a small inplane magnetic field (the drive field). The sample's response changes considerably in the presence of perpendicular stray fields that arise during magnetization reversal of the Ni film. The interplay between stray fields and flux lines inside the superconductor is associated to an enhancement of vortex entrance and exit, suggesting an effective magnetic coupling of the ferromagnetic and superconducting components. As a DC field probes the different configurations of the Ni layer throughout its hysteresis loop, the X′ signal traces a curve with irreversible features that are analogous to those of wellknown magnetoresistance measurements. A modification of the measuring temperature provides access to various kinds of superconductor/ferromagnet interaction.

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Section: Introductionmentioning

confidence: 99%