Correlation of composition, aspect ratio and magnetic resistance of multilayer micro- and nanowires of the “ferromagnetic / diamagnetic” type

The results of study the giant magnetoresistance coefficient (GMR) in multilayer micro- and nanowires based on successively alternating ferromagnetic (Co, CoNi NiFe) diamagnetic (Cu) layers are presented paper. samples were obtained by electrochemical deposition into matrix pores. Aluminum oxide was used as matrices. To establish influence aspect ratio, matrices two types used: with a pore diameter 8 µm 170–200 nm variable thickness from 10 to 60 µm. Investigations GMR carried out measuring current-voltage characteristics external magnetic fields up 130 mT. When using type I (pore μm), positive (an increase electrical resistivity an field) noted, while when II nm), negative established (a decrease resistance field). This is due enhancement interactions spin-polarized electrons through copper layer RKKY exchange ratio. A significant effect composition CoNi, value noted. maximum (up –27.5 %) for CoNi-based nanowire system. use nanowires, electrolytically deposited aluminum ability control coefficients, opens perspective these objects sensitive elements (sensors) constant field, well devices storing information vertical principle.