Saturation Magnetization in Copper-Nickel Alloys.

Ahern, S. A.; Sucksmith, Willie

doi:10.1088/0370-1301/69/10/411

Cited by 19 publications

(12 citation statements)

References 6 publications

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“…The magnetic moments for the out-of plane and in-plane component saturate at almost equal m ≈ 6.5 × 10 −6 emu corresponding to a saturation magnetization M = 130 kA/m. Using the density ρ = 8.92 g/cm 3 (bulk value) of the F-layer and the molar weight 60.6 g we can estimate the atomic saturation moment m at = 0.16µ B , in good agreement with m at = 0.15µ B found in literature 28 . In the inset of Fig.…”

Section: Magnetic Properties Of the F-layersupporting

confidence: 86%

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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Section: Magnetic Properties Of the F-layersupporting

confidence: 86%

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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show abstract

“…II A. The temperature dependence of the magnetization exhibits the paramagnetic to ferromagnetic transition at Curie temperatures which are somewhat lower than T C =180 K for Cu with 59 at°% Ni bulk material [39], namely, at T C = 100 K, 110 K and 118 K for samples #21 [40], Fig. 6) for d Cu = 10nm.…”

Section: Magnetic Properties Of the Ferromagnetic Alloy Layermentioning

confidence: 92%

Reentrant superconductivity in superconductor/ferromagnetic-alloy bilayers

et al. 2010

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We studied the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) like state established due to the proximity effect in superconducting Nb/Cu 41 Ni 59 bilayers. Using a special wedge-type deposition technique, series of 20-35 samples could be fabricated by magnetron sputtering during one run. The layer thickness of only a few nanometers, the composition of the alloy, and the quality of interfaces were controlled by Rutherford backscattering spectrometry, high resolution transmission electron microscopy, and Auger spectroscopy. The magnetic properties of the ferromagnetic alloy layer were characterized with superconducting quantum interference device (SQUID) magnetometry. These studies yield precise information about the thickness, and demonstrate the homogeneity of the alloy composition and magnetic properties along the sample series. The dependencies of the critical temperature on the Nb and Cu 41 Ni 59 layer thickness, T c (d S ) and T c (d F ), were investigated for constant thickness d F of the magnetic alloy layer and d S of the superconducting layer, respectively. All types of non-monotonic behaviors of T c versus d F predicted by the theory could be realized experimentally: from reentrant superconducting behavior with a broad extinction region to a slight suppression of superconductivity with a shallow minimum. Even a double extinction of superconductivity was observed, giving evidence for the multiple reentrant behavior predicted by theory. All critical temperature curves were fitted with suitable sets of parameters. Then, T c (d F ) diagrams of a hypothetical F/S/F spin-switch core structure were calculated using these parameters. Finally, superconducting spin-switch fabrication issues are discussed in detail in view of the achieved results.

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“…[7] for more details). As both the Curie temperature and the magnetic moment depend linearly on the concentration, an extrapolation [13] for 48% indicates a value E ex = 12 meV. Taking into account a mean free path in CuNi of about 1 nm, which corresponds to a electron diffusion coefficient D F of 5 cm 2 /s, this gives an estimated coherence length ξ F = 5.0 nm.…”

Section: Experimental Studymentioning

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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Saturation Magnetization in Copper-Nickel Alloys.

Cited by 19 publications

References 6 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

Reentrant superconductivity in superconductor/ferromagnetic-alloy bilayers

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

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