Inhomogeneous magnetism induced in a superconductor at a superconductor-ferromagnet interface

Krivoruchko, V. N.; Koshina, E. A.

doi:10.1103/physrevb.66.014521

Cited by 78 publications

(70 citation statements)

References 31 publications

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“…On the other hand, recent theoretical studies have focused on the inverse proximity effect, i.e. the induction of a magnetic moment in a superconductor in contact with a ferromagnet [8,9,10,11]. This phenomenon has been analyzed in Refs.…”

Section: Introductionmentioning

confidence: 99%

Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit

2005

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The inverse proximity effect, i.e. the induction of a magnetic moment in the superconductor in superconductor-ferromagnet (S/F) junctions is studied theoretically. We present a microscopic approach which combines a model Hamiltonian with elements of the well established quasiclassical theory. With its help we study systems with arbitrary degree of disorder, interface transparency and thickness of the layers. In the diffusive limit we recover the result of previous works: the direction of the induced magnetization M is opposite to the one of the F layer. However, we show that in the ballistic case the sign of M may be positive or negative depending on the quality of the interface and thickness of the layers. We show that, regardless of its sign, the penetration length of the magnetic moment into the superconductor is of the order of the superconductor coherence length, which demonstrates that the effect has a superconducting origin.

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Section: Introductionmentioning

confidence: 99%

Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit

2005

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“…e.g., [3]). It has been shown theoretically [4][5][6] that at S/F interface under the influence of exchange field a change in the density of states take place due to the differences for electrons with spin up and spin down. Later it was shown that the sign and magnitude of magnetic moment arising in the superconductor were highly dependent on the parameters of S/F interface such as transparency, presence of impurities and the thicknesses of layers [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Magnetic proximity effect at the interface between a cuprate superconductor and an oxide spin valve

Ovsyannikov

Демидов

Khaydukov

et al. 2016

J. Exp. Theor. Phys.

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“…The first is that the observed ferromagnetism induced in the S-layer has the same sign as that in the F-layer, which is in line with the prediction of ref. [3]. Considering the fact that we have a fully spin polarized ferromagnet CFS as the F-layer, the leakage or tunneling of same sign ferromagnetism into S-layer 3 is more likely rather than the opposite sign induced ferromagnetism 4,5 .…”

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confidence: 99%

“…The two macroscopic quantum states in S and F layers influence each other via the penetration of superconducting (proximity effect) 2 and ferromagnetic (inverse proximity effect) [3][4][5] order through their common interface. In presence of strong enough magnetic fields, the vortices in the S-layer can couple with the magnetic domains of the F-layer leading to interesting effects of domain wall pinning of the vortices and vice-a-versa, and domain wall superconductivity [6][7][8][9][10] .…”

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Giant coercivity enhancement and dimensional crossover of superconductivity in Co₂FeSi-NbN nanoscale bilayers

et al. 2013

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Proximity coupling and magnetic switching dynamics are shown to be correlated in bilayers (B) of fully spin polarized ferromagnet (F) Co 2 FeSi and superconductor (S) NbN. The upper critical field derived from resistivity measurements shows a dimensional crossover with a reduced effective thickness of the S layer. At temperatures (T) << superconducting T c , the measured M-H loops show two step switching; one at T-independent value 7 Oe and other at strongly T-dependent value becoming very large 1 kOe at 2 K. These results reveal induced ferromagnetism in S-layer at the S/F interface with vortex pinning influenced dynamics.PACS numbers: 74.45.+c, 74.78.-w, 74.25.Op 2The research field of superconducting (S) and ferromagnetic (F) bilayers (FSB), trilayers and multilayers has gained tremendous importance 1 due to their potential for magnetoeletronics related applications 2 ranging from spin valve to Josephson junctions based devices. The two macroscopic quantum states in S and F layers influence each other via the penetration of superconducting (proximity effect) 2 and ferromagnetic (inverse proximity effect) 3-5 order through their common interface. In presence of strong enough magnetic fields, the vortices in the S-layer can couple with the magnetic domains of the F-layer leading to interesting effects of domain wall pinning of the vortices and vice-a-versa, and domain wall superconductivity [6][7][8][9][10] . Most of such studies have been carried out with ferromagnetic component consisting of 3d transition metals like Fe, Co and Ni, and their alloys. Bilayers of strongly type II superconductors with fully spin polarized ferromagnetic (FSPF) Heusler alloys, which ideally have only one spin state and can potentially show fascinating electronic properties, have not been studied yet. Recently, our group has explored the use of the Co-based Heusler compound (Co 2 MnSi) electrodes for efficient injection of pure spin currents into superconducting NbN 11 . NbN is a type II superconductor of short coherence length ( (0) 5 nm) and long penetration depth ( (0) 200 nm) while Co 2 FeSi (CFS) is a ferromagnet of the Heusler family with high magnetic ordering temperature 1150 K and saturation magnetization 6 µ B per formula unit 12 . In the present work we investigate the nature of proximity coupling and its influence on magnetic switching dynamics in the hitherto unexplored NbN/Co 2 FeSi bilayers grown on (100) MgO.Thin film bilayers of superconducting NbN and CFS were deposited by pulsed laser ablation (PLD). The 35 nm thick NbN film first deposited on MgO at 200 0 C in nitrogen environment by ablating 99.99 % Nb target and then CFS layer of 35 nm thick was grown at the same temperature from a stoichiometric CFS target. To establish the magnetic ordering in CFS film, the FSB sample was annealed at 500 0 C for 1 hour. For comparison, a pure NbN film was also grown during the same PLD run. The other growth parameters for NbN and Co 2 FeSi layers can be found in our previous reports 13,14 . The crystalline quality and interf...

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Inhomogeneous magnetism induced in a superconductor at a superconductor-ferromagnet interface

Cited by 78 publications

References 31 publications

Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit

Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit

Magnetic proximity effect at the interface between a cuprate superconductor and an oxide spin valve

Giant coercivity enhancement and dimensional crossover of superconductivity in Co₂FeSi-NbN nanoscale bilayers

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Inhomogeneous magnetism induced in a superconductor at a superconductor-ferromagnet interface

Cited by 78 publications

References 31 publications

Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit

Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit

Magnetic proximity effect at the interface between a cuprate superconductor and an oxide spin valve

Giant coercivity enhancement and dimensional crossover of superconductivity in Co2FeSi-NbN nanoscale bilayers

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Giant coercivity enhancement and dimensional crossover of superconductivity in Co₂FeSi-NbN nanoscale bilayers