1,643,731 research outputs found
Spin Triplet Supercurrent in Co/Ni Multilayer Josephson Junctions with Perpendicular Anisotropy
We have measured spin-triplet supercurrent in Josephson junctions of the form
S/F'/F/F'/S, where S is superconducting Nb, F' is a thin Ni layer with in-plane
magnetization, and F is a Ni/[Co/Ni]n multilayer with out-of-plane
magnetization. The supercurrent in these junctions decays very slowly with
F-layer thickness, and is much larger than in similar junctions not containing
the two F' layers. Those two features are the characteristic signatures of
spin-triplet supercurrent, which is maximized by the orthogonality of the
magnetizations in the F and F' layers. Magnetic measurements confirm the
out-of-plane anisotropy of the Co/Ni multilayers. These samples have their
critical current optimized in the as-prepared state, which will be useful for
future applications.Comment: 4 pages, 4 figures, formatted in RevTeX version 4. Submitted to
Physical Review B on August 13th, 201
Proximity-induced density-of-states oscillations in a superconductor/strong-ferromagnet system
We have measured the evolution of the tunneling density of states (DOS) in
superconductor/ferromagnet (S/F) bilayers with increasing F-layer thickness,
where F in our experiment is the strong ferromagnet Ni. As a function of
increasing Ni thickness, we detect multiple oscillations in the DOS at the
Fermi energy from differential conductance measurements. The features in the
DOS associated with the proximity effect change from normal to inverted twice
as the Ni thickness increases from 1 to 5 nm.Comment: 4 pages, 4 figure
Critical Temperature Oscillations and Reentrant Superconductivity due to the FFLO like State in F/S/F Trilayers
Ferromagnet/Superconductor/Ferromagnet (F/S/F) trilayers, in which the
establishing of a Fulde-Ferrell Larkin-Ovchinnikov (FFLO) like state leads to
interference effects of the superconducting pairing wave function, form the
core of the superconducting spin valve. The realization of strong critical
temperature oscillations in such trilayers, as a function of the ferromagnetic
layer thicknesses or, even more efficient, reentrant superconductivity, are the
key condition to obtain a large spin valve effect, i.e. a large shift in the
critical temperature. Both phenomena have been realized experimentally in the
Cu 41 Ni 59 /Nb/Cu 41 Ni 59 trilayers investigated in the present work.Comment: 22 pages, 6 figure
Experimental f-value and isotopic structure for the Ni I line blended with [OI] at 6300A
We have measured the oscillator strength of the Ni I line at 6300.34 \AA,
which is known to be blended with the forbidden [O I] 6300 line, used
for determination of the oxygen abundance in cool stars. We give also
wavelengths of the two isotopic line components of Ni and Ni
derived from the asymmetric laboratory line profile. These two line components
of Ni I have to be considered when calculating a line profile of the 6300 \AA\
feature observed in stellar and solar spectra. We also discuss the labelling of
the energy levels involved in the Ni I line, as level mixing makes the
theoretical predictions uncertain.Comment: Accepted for publication in ApJLetter
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