HIGH-SENSITIVE GIANT MAGNETORESISTANCE IN PERMALLOY CU MULTILAYERS/

We report on giant magnetoresistance (GMR) of Si(100)/Cu-20nm/(Py-d(Py )/Cu-d(Cu))(100) where Py=Ni83Fe17, multilayer films prepared by face- to-face sputtering with 0.5 less than or equal to d(Cu)less than or eq ual to 3.5 nm and 0.5 less than or equal to d(Py)less than or equal to 10 nm. It has been shown that the GMR sensitivity depends on the rela tive changes of resistivity as well as on the value of the antiferroma gnetic interlayer exchange coupling strength J(AF) The highest GMR sen sitivity (0.5%/Oe) has been achieved for d(Cu)=2.1 nm and d(Py)=3.5 nm .