(1) Department of Applied Physics, Tianjin University, 300072 Tianjin, China
Abstract:
We review the recently discovered tunnel-type giant magnetoresistance (GMR) in ferromagnetic metalinsulator granular thin
films, which is the magnetoresistance (MR) associated with the spin-dependent tunneling between two ferromagnetic metal particles.
The theoretical and experimental results including electrical resistivity, magnetoresistance and their temperature dependence
are described. Limitations to the applications of the ferromagnetic metalinsulator granular films are also discussed. Additionally,
a brief survey of another two magnetic properties, high-frequency property and giant Hall effect (GHE) associated strongly
with the granular structures is also presented.