Magnetic and Transport Properties of Nb/PdNi Bilayers

Author

Matsuda, Ken-ichi ; Niwa, Hirotaka ; Akimoto, Yosuke ; Uemura, Testuya ; Yamamoto, Masafumi

Author_Institution

Hokkaido Univ., Sapporo

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

3529

Lastpage

3532

Abstract

We investigated the superconducting proximity effect in both Nb(35 nm)/PdNi superconductor (S)-ferromagnet (F) bilayer and Nb-Nb(10 nm)/PdNi-Nb (S-SF-S) variable-thickness bridges (VTBs). In Nb(35 nm)/PdNi(d_F nm) SF bilayer, non-monotonic behavior of the superconducting transition temperature T_c was observed as a function of PdNi thickness, d_F. This non-monotonic behavior of T_c can be interpreted from the view point of damped oscillatory superconducting order parameter induced in F-layer, and the effective exchange energy E_ex extracted from the data was approximately 150 K. On the other hand, in VTBs, it was found that the superconducting critical current I_c was monotonically decreased with increasing d_F.

Keywords

critical currents; ferromagnetic materials; lead alloys; magnetic multilayers; nickel alloys; niobium; proximity effect (superconductivity); superconducting thin films; superconducting transition temperature; Nb-PdNi; critical current; magnetic properties; size 10 nm; size 35 nm; superconducting proximity effect; superconducting transition temperature; superconductor-ferromagnet bilayer; superconductor-ferromagnet heterostructures; transport properties; Bridges; Josephson junctions; Magnetic properties; Niobium; Proximity effect; Sputtering; Superconducting epitaxial layers; Superconducting films; Superconducting magnets; Superconducting transition temperature; Proximity effect; superconducting films; superconductor-ferromagnet heterostructures;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.899972

Filename

4278196