Electromagnetic proximity effect in superconductor/ferromagnet bilayers with in-plane magnetic texture

Bespalov, A. A.

doi:10.1016/j.physc.2022.1354032

Cited by 3 publications

(1 citation statement)

References 52 publications

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“…The key observable predictions of the EM proximity effect are (i) B x decays with λ L , (ii) A EM oscillates in amplitude and sign with the thickness of the F layer, and (iii) A EM (and hence observable B x ) is present even in the absence of an applied magnetic field. The theoretical description of the additional screening currents caused by EM proximity effect is also considered and expanded to structures other than a F-S bilayer [9][10][11][12][13][14]. For example, the EM proximity effect also predicts the response of the F-F-S superconducting spin-valve structure [11] studied experimentally [2].…”

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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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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Side‐Gate Modulation of Supercurrent in InSb Nanoflag‐Based Josephson Junctions

Turini,

Salimian,

Carrega

et al. 2024

Physica Status Solidi (b)

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InSb nanoflags, due to their intrinsic spin–orbit interactions, are an interesting platform in the study of planar Josephson junctions. Ballistic transport, combined with high transparency of the superconductor/semiconductor interfaces, is reported to lead to interesting phenomena such as the Josephson diode effect. The versatility offered by the planar geometry can be exploited to manipulate both carrier concentration and spin–orbit strength by electrical means. Herein, experimental results on InSb nanoflag‐based Josephson junctions fabricated with side gates placed in close proximity to the junction are presented. It is shown that side gates can efficiently modulate the current through the junction, both in the dissipative and in dissipation‐less regimes, similar to what is obtained with a conventional back gate. Furthermore, the side gates can be used to influence the Fraunhofer interference pattern induced by the presence of an external out‐of‐plane magnetic field.

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