Magnetoresistance of trilayer films with Fe3O4

Abstract The magnetoresistance of [Co/M/Fe 3 O 4 ](M=Pt, Cu, TiN) trilayer films has been investigated. The high-quality Fe 3 O 4 film prepared by the magnetron spattering method using Ar–H 2 gas has been used. The GMR effect has been observed only for [Co/Cu/Fe 3 O 4 ]. The GMR values are 0.1% and 0.7% at RT and 4.2 K, respectively. The magnetoresistance effect for trilayers using Fe 3 O 4 film is discussed, considering the current ratio among three layers.