Title :
Magnetotransport in exchange-coupled magnetite junctions
Author :
Chopdekar, Rajesh V. ; Hu, Guohan ; Ford, Alexandra C. ; Suzuki, Yuri
Author_Institution :
Sch. of Appl. Phys., Cornell Univ., Ithaca, NY, USA
fDate :
7/1/2004 12:00:00 AM
Abstract :
Epitaxial magnetic junctions of theoretically half-metallic electrode material magnetite were fabricated with a cobalt chromite paramagnetic insulating tunnel barrier. This spinel structure barrier was chosen to be isostructural to the magnetite electrodes. Highly crystalline trilayers with low surface roughness were grown. Strong exchange coupling between the electrodes is observed across the barrier. Magnetoresistance measurements are reminiscent of a single ferromagnetic layer and not a junction.
Keywords :
cobalt alloys; diffusion barriers; exchange interactions (electron); ferromagnetic materials; insulating materials; magnetic epitaxial layers; magnetoresistance; paramagnetic materials; surface roughness; cobalt chromite paramagnetic; crystalline trilayers; electrode material magnetite; epitaxial magnetic junctions; exchange coupling; exchange-coupled magnetite junctions; ferromagnetic layer; half-metallic material; insulating tunnel barrier; magnetite electrodes; magnetoresistance measurements; magnetotransport; spin polarized electrode; spinel structure barrier; surface roughness; tunnel junctions; Cobalt; Crystalline materials; Crystallization; Electrodes; Insulation; Magnetic materials; Magnetoresistance; Paramagnetic materials; Rough surfaces; Surface roughness; Half metallic; magnetite; spin polarized electrode; tunnel junctions;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.829168
