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Magnetic interactions of iron nanoparticles in arrays and dilute dispersions
Dorothy Farrell1, Yuhang Cheng, R William McCallum
1Physics Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890, USA.
Abstract:
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.
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Ferromagnetism
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Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.