Synthesis and magnetic properties of multilayer

Ni/Cu and NiFe/Cu nanowires

 

R S LIU1,2,*, S C CHANG1, I BAGINSKIY2, S F HU2,3 and

C Y HUANG2,4

1Department of Chemistry, National Taiwan University, Taipei 106, Taiwan

2Taiwan Spin Research Center, National Chung Cheng University, Chia-Yi 621, Taiwan

3National Nano Device Laboratories, Hsinchu 300, Taiwan

4National Taiwan Normal University, Taipei 116, Taiwan

E-mail:  rsliu@ntu.edu.tw

 

Abstract. Highly ordered composite nanowires with multilayer  Ni/Cu and NiFe/Cu have been fabricated by pulsed electrodeposition into nanoporous alumina membrane. The diameter of wires can be easily varied by pore size of alumina, ranging from 30 to 100 nm. The applied potential and the duration of each potential square pulse determine the thickness of the metal layers. The nanowires have been characterized by transmission electron microscopy (TEM), magnetic force microscopy (MFM), and vibrating sample magnetometer (VSM) measurements. The MFM images indicate that every ferromagnetic layer separated by Cu layer was present as single isolated domain-like magnet. This

technique has potential use in the measurement and application of magnetic nanodevices.

 

Keywords. Nanowires; Ni/Cu; NiFe/Cu; anodic aluminum oxide.

 

PACS Nos 73.63.Bd; 75.30.Gw; 75.75.+a