Spin imbalance enhanced magnetoresistance in Co-Al-Co double-tunnel junctions

Author

Shyu, J.H. ; Tang, F.Y. ; Yao, Y.D. ; Chen, J.W.

Author_Institution

Dept. of Phys., Nat. Taiwan Univ., Taipei, Taiwan

fYear

2005

fDate

4-8 April 2005

Firstpage

1997

Lastpage

1998

Abstract

Spin-valve effect is a method that utilizes two ferromagnetic electrodes composed of parallel and antiparallel magnetization alignments to control transports of spin-polarized current. The enhancement of magnetoresistance by spin imbalance in Co-Al-Co double tunnel junctions with a superconductor as the central island. Since the central island is superconducting, the resultant nonequlibrium spin density strongly suppresses superconductivity which strongly affects the magnetoresistance. Electron-beam lithography and three-angle shadow evaporation techniques were used to prepare the samples.

Keywords

aluminium; cobalt; electron beam lithography; evaporation; ferromagnetic materials; magnetisation; spin polarised transport; spin valves; tunnelling magnetoresistance; type I superconductors; Co-Al-Co; antiparallel magnetization; central island; double-tunnel junctions; electron-beam lithography; ferromagnetic electrodes; parallel magnetization; spin density; spin imbalance enhanced magnetoresistance; spin-polarized current; spin-valve effect; superconductor; three-angle shadow evaporation; Electrodes; Electrons; Enhanced magnetoresistance; Josephson junctions; Magnetic fields; Magnetization; Physics; Superconductivity; Tunneling magnetoresistance; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Print_ISBN

0-7803-9009-1

Type

conf

DOI

10.1109/INTMAG.2005.1464437

Filename

1464437