Magnetization properties of CoCrPt alloy nanocylinders (nanowires and nanotubes) fabricated by low cost electrodeposition method have been investigated. Angular dependence of coercivity depicts curling mode of magnetization reversal process for CoCrPt nanowires (NWs) while for nanotubes (NTs) there is a transition from curling to coherent mode as a function of field angle. The effective anisotropy during reversal process is determined from a competition between the magnetostatic interactions, surface effects, and shape anisotropy in NTs while in NWs shape anisotropy is the dominant anisotropy. Furthermore, magnetization and remanence curves describe that the surface effects and dipolar coupling are increased in NTs as compared to the NWs due to their geometry. These results depict that the magnetization properties are influenced by the geometry of nanocylinders, which can become good candidate for ultrahigh density magnetic recording media.
Bibliographical noteFunding Information:
The project was supported by the State Key Project of Fundamental Research, Ministry of Sci. and Tech. (MOST Grant No.2006CB932200) and National Natural Science Foundation (NSFC Grant Nos.10874225 and 50721001) and Microfabrication Center of IOP.