2004
DOI: 10.1209/epl/i2003-10121-4
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Influence of the stray field of a magnetic dot on the nucleation of superconductivity in a disk

Abstract: We have investigated the nucleation of superconductivity in an Al mesoscopic disk, with a magnetic dot on the top. The dot is magnetized perpendicularly, and its magnetic field is inhomogeneous. The Al disk and magnetic dot are separated by an insulating layer, which ensures that there is only magnetic interaction between them. This hybrid superconductor/ferromagnet structure exhibits the maximum critical temperature for a finite value of the perpendicular applied magnetic field, which is parallel to the magne… Show more

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Cited by 14 publications
(12 citation statements)
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“…The observed periodic cusp-like behavior of the T c (H ext ) dependence was attributed to the field-induced transition between states with different vorticity similar to that of mesoscopic superconductors in a uniform magnetic field. However, the stray field, induced by the magnetized dot, was shown to be responsible for a peculiar asymmetry of the oscillatory T c (H ext ) phase boundary and a shift of the main T c maximum towards nonzero H ext values [54,133,134,135]. The mentioned abrupt modification of the preferable nucleation regime when sweeping H ext can lead to a double change in the slope of the T c (H ext ) envelope from T c0 /H Fig.…”
Section: Little-parks Oscillations In Mesoscopic Samplesmentioning
confidence: 99%
“…The observed periodic cusp-like behavior of the T c (H ext ) dependence was attributed to the field-induced transition between states with different vorticity similar to that of mesoscopic superconductors in a uniform magnetic field. However, the stray field, induced by the magnetized dot, was shown to be responsible for a peculiar asymmetry of the oscillatory T c (H ext ) phase boundary and a shift of the main T c maximum towards nonzero H ext values [54,133,134,135]. The mentioned abrupt modification of the preferable nucleation regime when sweeping H ext can lead to a double change in the slope of the T c (H ext ) envelope from T c0 /H Fig.…”
Section: Little-parks Oscillations In Mesoscopic Samplesmentioning
confidence: 99%
“…The transition from the GVS to a set of Φ 0 -vortices is caused by the reduced axial symmetry of squares and triangles and ensures that a vortex pattern conforms to the symmetry imposed by the boundary of the sample.In this paper we investigate the onset of superconductivity in a mesoscopic disk on which a magnetic triangle with out-of-plane magnetization is placed. The nucleation of superconductivity in hybrid superconductor/ferromagnet disks and loops has been studied previously, both experimentally and theoretically, as these are a good model system to gain insight into the interplay between superconductivity and magnetism in the context of magnetic vortex pinning and related phenomena [5,6,7,8]. In this paper we show that the symmetry of the magnetic triangle has a profound effect on the onset of superconductivity in the disk.…”
mentioning
confidence: 76%
“…As a result, superconductivity can be sustained in the sample up to very large FM-magnetization (as the slope ∂G/∂M decreases in 2). Note that this is not the case if FM has perpendicular magnetization, when total flux Φ F M captured by SC is positive and FM-induced vortices destroy superconductivity in the heart of the sample [8,9]. The experiment of Ref.…”
mentioning
confidence: 97%
“…The SC material is characterized by its coherence length at zero temperature, which we take as ξ(0) = 100nm (typical value for mesoscopic Al samples [8]), and FM material by its saturation magnetization M . In our calculations, the FM is positioned at the center of the SC square, and since its stray field has opposite polarity at the FM-poles (see inset (a) in Fig.…”
mentioning
confidence: 99%
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