Magnetic interactions of iron nanoparticles in arrays and dilute dispersions.
The magnetic properties of monodisperse Fe nanoparticles with over 4 orders of magnitude difference in concentration are studied by a combination of ordinary and remanent hysteresis loops, zero field cooled magnetization as a function of temperature, and magnetic relaxation rates. We compare the behavior of dilute dispersions with different concentrations, dispersions, and arrays made from the same particles, and nanoparticle arrays with different particle sizes and separations. The results are related to theoretical predictions and are used to create a unified picture of magnetostatic interactions within the assemblies.
Farrell
Dorothy
D
Physics Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890, USA.
Cheng
Yuhang
Y
McCallum
R William
RW
Sachan
Madhur
M
Majetich
Sara A
SA