The study of magnetoresistance and magnetic properties in [(CoO/NiO)/NiFe/Cu/NiFe] spin-valve thin films

[(CoO/NiO)/NiFe/Cu/NiFe] spin-valve 박막에서의 자기저항효과와 자기적 특성에 대한 연구

We have studied the magnetoresistance phenomena on spin valve thin films of antiferromagnetic NiO/CoO. Interlayer coupling oscillates between the antiferrocoupling and ferrocoupling with the variation of Cu thickness. The exchange coupling strength between NiO (antiferromagnetic) and NiFe(ferromagnetic) as a function of NiO texture and interface roughness is investigated by CoO insertion. CoO has significantly higher anisotropy in the (111) plane and interface roughness. It seems that the MR-ratio is increased by CoO inserted films. From the AFM and XRD data, the increase of MR-ratio and exchange field is influenced by the roughness of CoO.