Title :
Crystallographic alignment of nanoparticles during self-assembly
Author :
Kan, Shihai ; Sachan, Madhur ; Kirchhoff, Jennifer ; Majetich, Sara
Author_Institution :
Dept. of Phys., Carnegie Mellon Univ., Pittsburgh, PA, USA
Abstract :
Here we report on the partial alignment of equiaxed hcp Co and CoFe2O4 nanoparticles. In order to crystallographically orient the particles, Brownian rotation must dominate Neel rotation during array formation. The Neel relaxation rate is proportional to exp[KV/kT], where V is the particle volume and kT is the thermal energy. The Brownian relaxation rate is proportional to the effective viscosity and to V/kT.
Keywords :
cobalt; cobalt compounds; ferrites; ferromagnetic materials; magnetic particles; nanoparticles; self-assembly; viscosity; Brownian relaxation rate; Brownian rotation; Co; CoFe2O4; Neel relaxation rate; Neel rotation; array formation; effective viscosity; equiaxed hcp Co nanoparticles; equiaxed hcp CoFe2O4 nanoparticles; partial alignment; particle volume; thermal energy; Anisotropic magnetoresistance; Cobalt; Crystallography; Heating; Magnetic anisotropy; Nanoparticles; Perpendicular magnetic anisotropy; Phased arrays; Self-assembly; Temperature;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1463517
