Ballistic versus diffusive magnetoresistance of a magnetic point contact
Abstract
The quasiclassical theory of a nanosize point contacts (PC's) between two ferromagnets is developed. The maximum available magnetoresistance values in PC's are calculated for ballistic versus diffusive transport through the area of a contact. In the ballistic regime the magnetoresistance in excess of a few hundred percent is obtained for the iron-group ferromagnets. The necessary conditions for realization of so large a magnetoresistance in PC's, and the experimental results by García et al. are discussed.
- Publication:
-
Physical Review B
- Pub Date:
- March 2001
- DOI:
- 10.1103/PhysRevB.63.104428
- arXiv:
- arXiv:cond-mat/0207648
- Bibcode:
- 2001PhRvB..63j4428T
- Keywords:
-
- 75.70.Cn;
- 75.50.Cc;
- Magnetic properties of interfaces;
- Other ferromagnetic metals and alloys;
- Condensed Matter - Materials Science;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 4 pages, TEX, 1 Figure