Controlling the electromagnetic proximity effect by tuning the mixing between superconducting and ferromagnetic order

Stewart, Rhea; Flokstra, M. G.; Rogers, Matthew; Satchell, Nathan; Burnell, Gavin; Miller, Donald L.; Luetkens, H.; Prokscha, T.; Suter, A.; Morenzoni, E.

doi:10.1103/physrevb.100.020505

Cited by 18 publications

(13 citation statements)

References 31 publications

(42 reference statements)

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“…However, the recent theoretical and experimental works [30][31][32][33][34] unveiled one more unusual consequence of the proximity effect in S/F structures which is responsible for the anomalous enhancement of the stray magnetic fields generated in the superconducting subsystem even for the case of uniform in-plane magnetization in the F layer. This phenomenon called an electromagnetic proximity effect (EPE) is based on the fact that the Cooper pairs penetrating into the F layer interact with the magnetization field 4πM , which results in a formation of Meissner screening current inside the ferromagnet.…”

Section: Introductionmentioning

confidence: 99%

Giant electromagnetic proximity effect in superconductor/ferromagnet superlattices

Putilov,

Mironov,

Mel'nikov

et al. 2022

Preprint

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We show that in superlattices with alternating superconducting (S) and ferromagnetic (F) layers the spontaneous magnetic field induced in the superconducting layers due to the electromagnetic proximity effect becomes dramatically enhanced compared to the previously studied S/F bilayers. The effect reveals itself for the in-plane orientation of the magnetic moments both for ferromagnetic and anti-ferromagnetic ordering of the moments in the F layers. In the finite size samples the magnetic field decays from the sample surface towards the bulk of the structure, and the decay length strongly depends on the relative orientation of the sample surface, the layers planes and magnetic moments in the F layers. The obtained results provide additional insights into experimental data on the neutron scattering in Nb/Gd superlattices.

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Section: Introductionmentioning

confidence: 99%

Giant electromagnetic proximity effect in superconductor/ferromagnet superlattices

Putilov,

Mironov,

Mel'nikov

et al. 2022

Preprint

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“…Early attempts to study thin films of YBCO, for example, had limited success due to the large surface roughness [35]. Recently, improvements in thin film growth combined with experimental observations and theoretical predictions of proximity effects in superconductor-ferromagnet (S /F ) based heterostructures have renewed interest for characterizing the field expulsion profile in detail [38][39][40][41][42][43][44]. The PNR measurements and analysis performed here are expandable to a wide range of conventional and unconventional superconducting systems, and layered heterostructures containing both superconducting and nonsuperconducting layers.…”

Section: Introductionmentioning

confidence: 99%

Distortions to the penetration depth and coherence length of superconductor/normal-metal superlattices

Quarterman

Satchell

Kirby

et al. 2020

Phys. Rev. Materials

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Superconducting (S) thin film superlattices composed of Nb and a normal metal spacer (N) have been extensively utilized in Josephson junctions given their favorable surface roughness compared to Nb films of comparable thickness. In this work, we characterize the London penetration depth and Ginzburg-Landau coherence lengths of S /N superlattices using polarized neutron reflectometry and electrical transport. Despite the normal metal spacer layers being only approximately 8% of the total superlattice thickness, we surprisingly find that the introduction of these thin N spacers between S layers leads to a dramatic increase in the measured London penetration depth compared to that of a single Nb film of comparable thickness. Using the measured values for the effective inand out-of-plane coherence lengths, we quantify the induced anisotropy of the superlattice samples and compare to a single Nb film sample. From these results, we find that that the superlattices behave similarly to layered 2D superconductors.

show abstract

Section: Introductionmentioning

confidence: 99%

Distortions to the penetration depth and coherence length of superconductor/normal-metal superlattices

Quarterman,

Satchell,

Kirby

et al. 2020

Preprint

View full text Add to dashboard Cite

Superconducting (S ) thin film superlattices composed of Nb and a normal metal spacer (N ) have been extensively utilized in Josephson junctions given their favorable surface roughness compared to Nb thin films of comparable thickness. In this work, we characterize the London penetration depth and Ginzburg-Landau coherence length of S /N superlattices using polarized neutron reflectometry and electrical transport. Despite the normal metal spacer layer being significantly thinner than the coherence length, we find that the introduction of a thin N spacer between S layers leads to a dramatic increase in the London penetration depth and a decrease in the coherence length. Furthermore, the temperature dependence of the upper critical field suggests that the superlattices act as a layered 2D superconductor, despite the N thickness being more than a factor of two smaller than when such a 2D state is expected to occur. Using the measured values for the penetration depth and coherence length, we experimentally determine the Ginzburg-Landau parameter to quantify the superconducting disorder of the superlattice samples and compare to a single Nb thin film sample.

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Controlling the electromagnetic proximity effect by tuning the mixing between superconducting and ferromagnetic order

Cited by 18 publications

References 31 publications

Giant electromagnetic proximity effect in superconductor/ferromagnet superlattices

Giant electromagnetic proximity effect in superconductor/ferromagnet superlattices

Distortions to the penetration depth and coherence length of superconductor/normal-metal superlattices

Distortions to the penetration depth and coherence length of superconductor/normal-metal superlattices

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