摘要
NiO(70 nm)/NiFeCo(5 nm)/Cu(2 nm)/NiFeCo(5 nm)spin-valve multilayers were prepared by electron beam evaporation.It is found that the magnetoresistive(MR)ratio of the as-deposited films is relatively small(about 1.6%)and there is no apparent biasing in MR curves of as-deposited multilayers due to weak exchange coupling.Through heat treatment at a proper temperature in a magnetic field,the exchange field of the materials increases and the multilayers show good exchange-biased spin-valve MR character with MR value reaching about 2.5%.The proper temperature range for annealing is 200-250℃.With further increasing temperature,MR ratio drops rapidly.
作者
LU Zhi-hong
LI Tie
QIU Jin-jun
XUN Kun
SHEN Hong-lie
LI Zuo-yi
SHEN De-fang
卢志红;李铁;邱进军;荀坤;沈鸿烈;李佐宜;沈德芳(Optic Disc and Magnetic Material Laboratory,Shanghai Institute of Metallurgy,Chinese Academy of Sciences,Shanghai 200050;Functional Material Laboratory,Shanghai Institute of Metallurgy,Chinese Academy of Sciences,Shanghai 200050;Department of Solid State Electronics,Huazhong University of Science and Technology,Wuhan 430074)
