Reentrance phenomenon in superconductor/ferromagnet nanostructures and their application in superconducting spin valves for superconducting electronics

Сидоренко, А. С.

doi:10.1063/1.4995623

Cited by 8 publications

(4 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Artificial heterostructures with alternating superconducting (S) and ferromagnetic (F) layers are currently attracting great attention due to a diverse set of proximity effects [1][2][3][4][5], including the Larkin-Ovchinnikov-Fulde-Ferrell phase, π-phase superconductivity and triplet pairing. These effects show how ferromagnetism influences the superconducting properties of the S/F heterostructures.…”

mentioning

confidence: 99%

Magnetic proximity effect in Nb/Gd superlattices seen by neutron reflectometry

et al. 2019

View full text Add to dashboard Cite

We have used spin-polarized neutron reflectometry to investigate the magnetization profile of superlattices composed of ferromagnetic Gd and superconducting Nb layers. We have observed a partial suppression of ferromagnetic (F) order of Gd layers in [Gd(dF )/Nb(25nm)]12 superlattices below the superconducting (S) transition of the Nb layers. The amplitude of the suppression decreases with increasing dF . By analyzing the neutron spin asymmetry we conclude that the observed effect has an electromagnetic origin -the proximity-coupled S layers screen out the external magnetic field and thus suppress the F response of the Gd layers inside the structure. Our investigation demonstrates the considerable influence of electromagnetic effects on the magnetic properties of S/F systems.Artificial heterostructures with alternating superconducting (S) and ferromagnetic (F) layers are currently attracting great attention due to a diverse set of proximity effects [1-5], including the Larkin-Ovchinnikov-Fulde-Ferrell phase, π-phase superconductivity and triplet pairing. These effects show how ferromagnetism influences the superconducting properties of the S/F heterostructures. Converse proximity effects in which superconductivity influences ferromagnetism have received less attention. Such magnetic proximity effects are expected in systems where the F and S transition temperatures, T F and T c , are comparable, which is the case for heterostructures of cuprate high-T c superconductors and ferromagnetic manganates [6][7][8][9], and for some bulk compounds [10][11][12]. However, because of the chemical and electronic complexity of these materials, simple model systems for magnetic proximity effects are highly desirable.

show abstract

mentioning

confidence: 99%

Magnetic proximity effect in Nb/Gd superlattices seen by neutron reflectometry

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The proximity effect between superconductors and ferromagnets has been investigated intensively in recent years [1,2], giving rise to the field of superconducting spintronics [3,4]. Among the emergent phenomena are π-junctions [5,6], reentrant and multiperiodic reentrant superconductivity [7,8], the triplet proximity effect [9][10][11], and implementations of superconducting switches and spin valves based on either the singlet or triplet proximity effect [12][13][14][15][16][17][18]. Furthermore, the spin-dependent density of states due to the proximity of a magnetic insulator is central for obtaining unprecedentedly high thermoelectric performance at low temperatures [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of field-dependent spin splitting at ferromagnetic insulator–superconductor interfaces

Machon¹,

Wolf²,

Beckmann³

et al. 2022

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

We present a combined experimental and theoretical work that investigates the magnetic proximity effect at a ferromagnetic insulator–superconductor (FI–S) interface. The calculations are based on the boundary condition for diffusive quasiclassical Green’s functions, which accounts for arbitrarily strong spin-dependent effects and spin mixing angles. The resulting phase diagram shows a transition from a first-order to a second-order phase transition for large spin mixing angles. The experimentally found differential conductance of an EuS-Al heterostructure is compared with the theoretical calculation. With the assumption of a uniform spin mixing angle that depends on the externally applied field, we find good agreement between theory and experiment. The theory depends only on very few parameters, mostly specified by the experimental setup. We determine the effective spin of the interface moments as J ≈ 0.74ℏ.

show abstract

“…One type of magnetic nanostructure with wide potential use is the spin valve [ 14 – 15 ], consisting of several magnetic films separated by a magneto-resistive layer. Due to the exchange interaction with the adjacent antiferromagnetic nanofilm, one of the layers has constant magnetization.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics modeling of the influence forming process parameters on the structure and morphology of a superconducting spin valve

Vakhrushev¹,

Fedotov²,

Boian³

et al. 2020

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

This work is a study of the formation processes and the effect of related process parameters of multilayer nanosystems and devices for spintronics. The model system is a superconducting spin valve, which is a multilayer structure consisting of ferromagnetic cobalt nanolayers separated by niobium superconductor nanolayers. The aim was to study the influence of the main technological parameters including temperature, concentration and spatial distribution of deposited atoms over the nanosystem surface on the atomic structure and morphology of the nanosystem. The studies were carried out using the molecular dynamics method using the many-particle potential of the modified embedded-atom method. In the calculation process the temperature was controlled using the Nose–Hoover thermostat. The simulation of the atomic nanolayer formation was performed by alternating the directional deposition of different composition layers under high vacuum and stationary temperature conditions. The structure and thickness of the formed nanolayers and the distribution of elements at their interfaces were studied. The alternating layers of the formed nanosystem and their interfaces are shown to have significantly different atomic structures depending on the main parameters of the deposition process.

show abstract

Reentrance phenomenon in superconductor/ferromagnet nanostructures and their application in superconducting spin valves for superconducting electronics

Cited by 8 publications

References 46 publications

Magnetic proximity effect in Nb/Gd superlattices seen by neutron reflectometry

Magnetic proximity effect in Nb/Gd superlattices seen by neutron reflectometry

Experimental and theoretical study of field-dependent spin splitting at ferromagnetic insulator–superconductor interfaces

Molecular dynamics modeling of the influence forming process parameters on the structure and morphology of a superconducting spin valve

Contact Info

Product

Resources

About