Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition  

作　　者：CHENG Hao YANG Wei LIU Hong LI HongLian WANG LingJiang 

机构地区：[1]School of Electronic and Information Engineering,Chengdu University

出　　处：《Chinese Science Bulletin》2013年第6期598-602,共5页

摘　　要：A "T" shaped micro-gap was fabricated by mechanical polishing between two Cu film electrodes on the surface of single-sided bonded copper.A nano-gap was then fabricated in the prepared micro-gap by resistance feedback controlled electroplating.Finally Ni 80 Fe 20 ferromagnetic nanocontacts of several sizes were fabricated in the prepared nano-gap by resistance feedback controlled electroplating.The magnetoresistance of each Ni 80 Fe 20 ferromagnetic nanocontact was not related to its size.Fabrication of the Ni 80 Fe 20 ferromagnetic nanocontacts in the nano-gap can reduce the contribution of magnetostriction to the magnetoresistance.The magnetoresistance values of the Ni 80 Fe 20 ferromagnetic nanocontacts were as high as those of the Ni ferromagnetic nanocontacts.This implies that the contribution of magnetostriction to the ballistic magnetoresistance of the ferromagnetic nanocontacts can be neglected.The ferromagnetic nanocontacts fabricated in this study,and in other cases,have two anisotropic interfaces on the sides of the nanocontacts.However,the magnetic field can alter the contribution of the interaction between the two anisotropic interfaces to the ballistic magnetoresistance of the ferromagnetic nanocontacts,and this effect can not be ruled out yet.A ＂T＂ shaped micro-gap was fabricated by mechanical polishing between two Cu film electrodes on the surface of single-sided bonded copper. A nano-gap was then fabricated in the prepared micro-gap by resistance feedback controlled electroplating. Final- ly Ni80Fe20 ferromagnetic nanocontacts of several sizes were fabricated in the prepared nano-gap by resistance feedback controlled electroplating. The magnetoresistance of each Ni80Fe20 ferromagnetic nanocontact was not related to its size. Fabrication of the NisoFe2o ferromagnetic nanocontacts in the nano-gap can reduce the contribution of magnetostriction to the magnetoresistance. The magnetoresistance values of the Ni80Fe20 ferromagnetic nanocontacts were as high as those of the Ni ferromagnetic nanocon- tacts. This implies that the contribution of magnetostriction to the ballistic magnetoresistance of the ferromagnetic nanocontacts can be neglected. The ferromagnetic nanocontacts fabricated in this study, and in other cases, have two anisotropic interfaces on the sides of the nanocontacts. However, the magnetic field can alter the contribution of the interaction between the two anisotropic interfaces to the ballistic magnetoresistance of the ferromagnetic nanocontacts, and this effect can not be ruled out yet.

关 键 词：铁磁 制造 反馈电阻 反馈控制 磁致伸缩 各向异性 小间隙 机械抛光 

分 类 号：O482.5[理学—固体物理] TP212[理学—物理]