Magnetic superconductors

Buzdin, A. I.; Bulaevskiǐ, L. N.; Kulich, M; Panyukov, Sergey

doi:10.1070/pu1984v027n12abeh004085

Cited by 84 publications

(95 citation statements)

References 102 publications

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“…In Sec. II, we demonstrate that, in the case of thin F layer and small domain wall thickness, the problem is somewhat similar to that of the domain wall superconductivity in ferromagnetic superconductor 8,9 . For the case when the superconducting coherence length ξ s exceeds the DW thickness w, we expect a very strong local increase of T c (see Sec.…”

Section: Introductionmentioning

confidence: 89%

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Theory of domain-wall superconductivity in superconductor/ferromagnet bilayers

Houzet

Buzdin

2006

Phys. Rev. B

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We analyze the enhancement of the superconducting critical temperature of superconducting/ferromagnetic bilayers due to the appearance of localized superconducting states in the vicinity of magnetic domain walls in the ferromagnet. We consider the case when the main mechanism of the superconductivity destruction via the proximity effect is the exchange field. We demonstrate that the influence of the domain walls on the superconducting properties of the bilayer may be quite strong if the domain wall thickness is of the order of superconducting coherence length.

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Section: Introductionmentioning

confidence: 89%

“…In Ref. 8, the zero temperature critical field was obtained in the context of magnetic superconductors. Here, we revise the result and obtain the phase diagram at finite temperature.…”

Section: Narrow Domain Wallmentioning

confidence: 99%

Theory of domain-wall superconductivity in superconductor/ferromagnet bilayers

Houzet

Buzdin

2006

Phys. Rev. B

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“…At the Fermi level, the wave-vector mismatch is δk = k F E ex /E F where k F and E F are the Fermi wave-vector and energy. The Andreev pairs have therefore a non-zero momentum, which induces an oscillation of the pair density as a function of the distance to the interface [3,4,5]. In a diffusive ferromagnetic metal, the oscillation goes together with a decay on the same length scale, i.e.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling spectroscopy of the superconducting proximity effect in a diluted ferromagnetic alloy

et al. 2005

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We studied the proximity effect between a superconductor (Nb) and a diluted ferromagnetic alloy (CuNi) in a bilayer geometry. We measured the local density of states on top of the ferromagnetic layer, which thickness varies on each sample, with a very low temperature Scanning Tunneling Microscope. The measured spectra display a very high homogeneity. The analysis of the experimental data shows the need to take into account an additional scattering mechanism. By including in the Usadel equations the effect of the spin relaxation in the ferromagnetic alloy, we obtain a good description of the experimental data.

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“…The basic one reveals when the superconducting (S) electrodes are separated by a ferromagnetic (F) layer. The exchange field inside the ferromagnet produces the spatial oscillations of the Cooper pair wave function, and depending on the ratio between the oscillation period and the F-layer thickness the ground state phase is equal to 0 or π (these cases are referred as 0 or π JJs, respectively) [9][10][11]. A peculiar situation is realized when the thickness d of the ferromagnet varies along the junction in a way that in some parts of the ferromagnet the value of d corresponds to the 0 state while in other parts to the π state (see Ref.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Josephson effect controlled by an Abrikosov vortex

et al. 2017

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The possibility of a fast and precise Abrikosov vortex manipulation by a focused laser beam opens the way to create laser-driven Josephson junctions. We theoretically demonstrate that a vortex pinned in the vicinity of the Josephson junction generates an arbitrary ground state phase which can be equal not only to 0 or π but to any desired ϕ 0 value in between. Such ϕ 0 junctions have many peculiar properties and may be effectively controlled by the optically driven Abrikosov vortex. Also we theoretically show that the Josephson junction with the embedded vortex can serve as an ultrafast memory cell operating at sub THz frequencies. I. INTRODUCTIONJosephson junctions (JJs) with nonzero spontaneous phase difference between the superconducting electrodes in the ground state (the so-called π , ϕ 0 , and ϕ JJs) have become the subject of intensive theoretical and experimental study during the past decade [1,2]. The most striking feature of such junctions is their ability to generate a current in the superconducting circuit, thus acting as a phase battery [3][4][5][6]. In addition, relatively small variation of the system parameters may provoke dramatic changes in the ground state phase difference, which is believed to provide new effective tools for controlling the currents in microelectronic devices (see, e.g., Refs. [7,8]).There are several generic mechanisms leading to the spontaneous appearance of nonzero Josephson phase. The basic one reveals when the superconducting (S) electrodes are separated by a ferromagnetic (F) layer. The exchange field inside the ferromagnet produces the spatial oscillations of the Cooper pair wave function, and depending on the ratio between the oscillation period and the F-layer thickness the ground state phase is equal to 0 or π (these cases are referred as 0 or π JJs, respectively) [9][10][11]. A peculiar situation is realized when the thickness d of the ferromagnet varies along the junction in a way that in some parts of the ferromagnet the value of d corresponds to the 0 state while in other parts to the π state (see Ref. [12] and references therein). If there is only a slight difference between the areas of the "0" and "π " regions the phase frustration can result in the appearance of a state with the spontaneous phase difference φ = ±ϕ = 0,π which is degenerate (ϕ JJ) (see Ref.[13] and references therein). A similar effect takes place in Josephson junctions with the current injectors acting as an effective source of the phase jumps along the junction (see and references therein). One can also obtain a ϕ 0 JJ, where the ground state phase φ = ϕ 0 is not degenerate, e.g., using the JJs with broken inversion symmetry [17]. In this case the superconducting current I through the junction should not be necessarily an odd function of the phase difference φ and can take the form I = I c sin(φ + ϕ 0 ) [17]. Such situation is realized in the S|F|S junctions with strong spin-orbit coupling (see and references therein) or complicated noncollinear distribution of the magnetization (see an...

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Magnetic superconductors

Cited by 84 publications

References 102 publications

Theory of domain-wall superconductivity in superconductor/ferromagnet bilayers

Theory of domain-wall superconductivity in superconductor/ferromagnet bilayers

Scanning tunneling spectroscopy of the superconducting proximity effect in a diluted ferromagnetic alloy

Anomalous Josephson effect controlled by an Abrikosov vortex

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