Josephson Junctions With Centered Step and Local Variation of Critical Current Density

Weides, Martin

doi:10.1109/tasc.2009.2019049

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…The model discussed in this paper on the basis of 0-π junctions can be extended, e.g., to SIFS junctions having step-like j c (x) profile 35 , or laterally ordered ferromagnetic domains.…”

Section: Discussionmentioning

confidence: 99%

Magnetic interference patterns in 0-Pi SIFS Josephson junctions: effects of asymmetry between 0 and Pi regions

Kemmler,

Weides,

Weiler

et al. 2009

Preprint

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We present a detailed analysis of the dependence of the critical current Ic on the magnetic field B of 0, π, and 0-π superconductor-insulator-ferromagnet-superconductor Josephson junctions. Ic(B) of the 0 and π junction closely follows a Fraunhofer pattern, indicating a homogeneous critical current density jc(x). The maximum of Ic(B) is slightly shifted along the field axis, pointing to a small remanent in-plane magnetization of the F-layer along the field axis. Ic(B) of the 0-π junction exhibits the characteristic central minimum. Ic however has a finite value here, due to an asymmetry of jc in the 0 and π part. In addition, this Ic(B) exhibits asymmetric maxima and bumped minima. To explain these features in detail, flux penetration being different in the 0 part and the π part needs to be taken into account. We discuss this asymmetry in relation to the magnetic properties of the F-layer and the fabrication technique used to produce the 0-π junctions.

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“…The model discussed in this paper on the basis of 0-π junctions can be extended, e.g., to SIFS junctions having step-like j c (x) profile 35 , or laterally ordered ferromagnetic domains.…”

Section: Discussionmentioning

confidence: 99%

Magnetic interference patterns in 0-Pi SIFS Josephson junctions: effects of asymmetry between 0 and Pi regions

Kemmler,

Weides,

Weiler

et al. 2009

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Various 0-0 (I c,1 , I c,2 > 0), π-π (I c,1 , I c,2 < 0) and 0-π (I c,1 > 0, I c,2 < 0) SIFS JJs based on diluted NiCu alloy were already fabricated and studied by us [8,11,12,13]. In comparison with other types of 0-π JJs, such as SFS or d-wave/s-wave [14,15], the intrinsic capacitance of SIFS JJs makes these JJs underdamped, so that one can study the dynamics, make spectroscopy [16] or use them in macroscopic quantum circuits [1].…”

mentioning

confidence: 99%

“…Various 0-0 (I c,1 , I c,2 > 0), π-π (I c,1 , I c,2 < 0) and 0-π (I c,1 > 0, I c,2 < 0) SIFS JJs based on a diluted NiCu alloy were already fabricated and studied by us [8,[11][12][13].…”

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confidence: 99%

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Critical current diffraction pattern of SIFS Josephson junctions with a step-like F-layer

Weides

Peralagu

Kohlstedt

et al. 2010

Supercond. Sci. Technol.

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We present the latest generation of superconductor-insulator-ferromagnetsuperconductor Josephson tunnel junctions with a step-like thickness of the ferromagnetic (F) layer. The F-layer thicknesses d 1 and d 2 in both halves were varied to obtain different combinations of positive and negative critical current densities j c,1 and j c,2 . The measured dependences of the critical current on applied magnetic field can be well described by a model which takes into account different critical current densities (obtained from reference junctions) and different net magnetization of the multidomain ferromagnetic layer in both halves.

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Magnetic interference patterns in0−πsuperconductor/insulator/ferromagnet/superconductor Josephson junctions: Effects of asymmetry between 0 andπregions

Kemmler

Weides²,

Weiler

et al. 2010

Phys. Rev. B

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We present a detailed analysis of the dependence of the critical current I c on an in-plane magnetic field B of 0, , and 0-superconductor-insulator-ferromagnet-superconductor Josephson junctions. I c ͑B͒ of the 0 and the junction closely follows a Fraunhofer pattern, indicating a homogeneous critical current density j c ͑x͒. The maximum of I c ͑B͒ is slightly shifted along the field axis, pointing to a small remanent in-plane magnetization of the F-layer along the field axis. I c ͑B͒ of the 0-junction exhibits the characteristic central minimum. I c , however, has a finite value here, due to an asymmetry of j c in the 0 and the part. In addition, this I c ͑B͒ exhibits asymmetric maxima and bumped minima. To explain these features in detail, flux penetration being different in the 0 part and the part needs to be taken into account. We discuss this asymmetry in relation to the magnetic properties of the F-layer and the fabrication technique used to produce the 0-junctions.

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Josephson Junctions With Centered Step and Local Variation of Critical Current Density

Cited by 4 publications

References 23 publications

Magnetic interference patterns in 0-Pi SIFS Josephson junctions: effects of asymmetry between 0 and Pi regions

Magnetic interference patterns in 0-Pi SIFS Josephson junctions: effects of asymmetry between 0 and Pi regions

Critical current diffraction pattern of SIFS Josephson junctions with a step-like F-layer

Magnetic interference patterns in0−πsuperconductor/insulator/ferromagnet/superconductor Josephson junctions: Effects of asymmetry between 0 andπregions

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