Controlled superconducting vortex creation raises hope for a dissipationless memory device

Satchell, Nathan

doi:10.1088/1361-6668/aafa9a

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…Such stray fields are in some applications considered problematic, for example they can significantly distort the Fraunhofer pattern of ferromagnetic Josephson junctions reducing device functionality [33][34][35]. It is also possible, however, to engineer structures and devices in which the stray fields provide functionality, such as influencing the ferromagnetic domain structure or providing pinning sites for Abrikosov vortices [36][37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Absence of magnetic interactions in Ni–Nb ferromagnet–superconductor bilayers

Satchell

Quarterman

Borchers

et al. 2023

Supercond. Sci. Technol.

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Studies of ferromagnet-superconductor hybrid systems have uncovered magnetic interactions between the competing electronic orderings. The electromagnetic (EM) proximity effect predicts the formation of a spontaneous vector potential inside a superconductor placed in proximity to a ferromagnet. In this work, we use a Nb superconducting layer and Ni ferromagnetic layer to test for such magnetic interactions. We use the complementary, but independent, techniques of polarized neutron reflectometry and detection Josephson junctions to probe the magnetic response inside the superconducting layer at close to zero applied field. In this condition, Meissner screening is negligible, so our measurements examine only additional magnetic and screening contributions from proximity effects. We report the absence of any signals originating from EM proximity effect in zero applied field. Our observations indicate that either EM proximity effect is below the detection resolution of both of our experiments or may indicate a new phenomenon that requires extension of current theory. From our measurements, we estimate a limit of the size of the zero field EM proximity effect in our Ni–Nb samples to be ±0.27 mT.

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