Large Effects of Magnetic Field on Josephson Currents Through Antiferromagnetic Barriers
Abstract
Ferromagnetism being known to have a detrimental effect on superconductivity, we consider the Josephson current amplitude for junctions built up of antiferromagnetic metallic weak links. It is assumed that the latter consist of ferromagnetic layers with magnetizations aligned alternatively along perpendicular-to-the-layers direction. Currents between two superconducting electrodes flow along the layers. Such antiferromagnetic structure realizes itself in mixed valence manganites (the so-called A-phase), in an array of parallel ferromagnetic domains, or even in artificial GMR heterostructures. It is shown that even minor canting of magnetic moments in the presence of magnetic fields causes remarkable oscillations in the value of the Josephson current amplitude.
- Publication:
-
Physical Phenomena at High Magnetic Fields-IV
- Pub Date:
- July 2002
- DOI:
- 10.1142/9789812777805_0109
- Bibcode:
- 2002pphm.conf..424G