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000009174 084__ $$2WoS$$aPhysics, Condensed Matter
000009174 1001_ $$0P:(DE-HGF)0$$aGürlich, C.$$b0
000009174 245__ $$aVisualizing supercurrents in ferromagnetic Josephson junctions with various arrangements of 0 and pi segments
000009174 260__ $$aCollege Park, Md.$$bAPS$$c2010
000009174 300__ $$a094502
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000009174 520__ $$aJosephson junctions with ferromagnetic barrier can have positive or negative critical current depending on the thickness d(F) of the ferromagnetic layer. Accordingly, the Josephson phase in the ground state is equal to 0 (a conventional or 0 junction) or to pi (pi junction). When 0 and pi segments are joined to form a "0-pi junction," spontaneous supercurrents around the 0-pi boundary can appear. Here we report on the visualization of supercurrents in superconductor-insulator-ferromagnet-superconductor (SIFS) junctions by low-temperature scanning electron microscopy (LTSEM). We discuss data for rectangular 0, pi, 0-pi, 0-pi-0, and 20 x (0-pi-) junctions, disk-shaped junctions where the 0-pi boundary forms a ring, and an annular junction with two 0-pi boundaries. Within each 0 or pi segment the critical current density is fairly homogeneous, as indicated both by measurements of the magnetic field dependence of the critical current and by LTSEM. The pi parts have critical current densities j(c)(pi) up to 35 A/cm(2) at T = 4.2 K, which is a record value for SIFS junctions with a NiCu F-layer so far. We also demonstrate that SIFS technology is capable to produce Josephson devices with a unique topology of the 0-pi boundary.
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000009174 7001_ $$0P:(DE-HGF)0$$aScharinger, S.$$b1
000009174 7001_ $$0P:(DE-Juel1)VDB59925$$aWeides, M.$$b2$$uFZJ
000009174 7001_ $$0P:(DE-Juel1)VDB3107$$aKohlstedt, H.$$b3$$uFZJ
000009174 7001_ $$0P:(DE-HGF)0$$aMints, R.G.$$b4
000009174 7001_ $$0P:(DE-HGF)0$$aGoldobin, E.$$b5
000009174 7001_ $$0P:(DE-HGF)0$$aKoelle, D.$$b6
000009174 7001_ $$0P:(DE-HGF)0$$aKleiner, R.$$b7
000009174 77318 $$2Crossref$$3journal-article$$a10.1103/physrevb.81.094502$$bAmerican Physical Society (APS)$$d2010-03-03$$n9$$p094502$$tPhysical Review B$$v81$$x1098-0121$$y2010
000009174 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.81.094502$$gVol. 81, p. 094502$$n9$$p094502$$q81<094502$$tPhysical review / B$$v81$$x1098-0121$$y2010
000009174 8567_ $$uhttp://dx.doi.org/10.1103/PhysRevB.81.094502
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