Magnetotransport of magnetite nanoparticle arrays
Abstract
We combine a material self-assembly with conventional lithographic processes in order to fabricate magnetoelectronic devices composed of ordered three-dimensional arrays of magnetite (Fe3O4) nanoparticles. The device magnetoresistance reaches 35% at 60 K, corresponding to an electron spin polarization of 73%. Magnetoresistance of 12% remains at room temperature. Magnetoresistance decreases with both increasing temperature and bias voltage, however, the magnetoresistance of nanoparticle-based structures is only weakly dependent on the voltage—a favorable attribute for application to electronics.
- Publication:
-
Physical Review B
- Pub Date:
- January 2006
- DOI:
- 10.1103/PhysRevB.73.020402
- Bibcode:
- 2006PhRvB..73b0402Z
- Keywords:
-
- 75.47.-m;
- 75.75.+a;
- 73.63.Bd;
- Magnetotransport phenomena;
- materials for magnetotransport;
- Magnetic properties of nanostructures;
- Nanocrystalline materials