Manufacturing and magnetic force microscopy characterization of magnetic nanowires and nanotubes
(2015)
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- Abstract
- The rapid development of Nanotechnology that tends to progressively replace present systems with novel miniaturized devices based on nano-objects induces an increasing demand for new types of nanomaterials with different structures and improved physical properties. This leads, along with other conceivable candidates, to the production of magnetic nanowires (NWs) and nanotubes (NTs) with unique magnetic properties. These nanomaterials have potential applications in microwave devices, chemical sensors, high density data storage devices, light emitters, etc... They also got an enormous attraction in biological and biomedical applications e.g. for hyperthermia usage to treat cancer cells. When it comes to the application of NW or NT arrays for data storage, there is a basic need of understanding and controlling the magnetization behavior and reversal process. In the present work, magnetic force microscopy (MFM) has been used to characterize low and medium packing density arrays of magnetic NWs and NTs manufactured by electrodeposition in nanoporous polycarbonate membranes. This was realized using a modified MFM setup allowing in-situ and in-field measurements. The influence of the material and geometrical parameters (composition, diameter, shape) on the magnetization reversal process was studied. It is demonstrated that in low density arrays, the dipolar interaction is negligible and that the switching field distribution broadening is mainly due to intrinsic parameters such as the size (diameter) distribution of the NWs. MFM also allows observing the magnetic reversal of individual NWs. This provides detailed information on the local dependence of the dipolar interaction on the inter-wire distance at the nanoscale, which cannot be done by standard magnetometry techniques.
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Tabasum, M. R. (2015). Manufacturing and magnetic force microscopy characterization of magnetic nanowires and nanotubes. https://hdl.handle.net/2078.5/190375