Magnetoresistance of the ferromagnetic nanocontacts fabricated by electrodeposition

• Published in: Chinese science bulletin 2013-02, Vol.58 (6), p.598-602
• Main Authors: Cheng, Hao, Yang, Wei, Liu, Hong, Li, HongLian, Wang, LingJiang
• Format: Article
• Language: English
• Subjects: Anisotropy; Chemistry/Food Science; copper; Earth Sciences; electrodes; Engineering; Feedback; Ferromagnetism; Humanities and Social Sciences; Life Sciences; magnetic fields; Magnetoresistance; Magnetoresistivity; multidisciplinary; Nanocomposites; Nanomaterials; Nanostructure; nickel; Physics; Science; Science (multidisciplinary); 制造; 反馈控制; 反馈电阻; 各向异性; 小间隙; 机械抛光; 磁致伸缩; 铁磁
• ISSN: 1001-6538; 1861-9541
• DOI: 10.1007/s11434-012-5393-7

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.