First-Order-Reversal-Curve Analysis of Nanoscale Magnetic Materials


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Magnetic nanowires, nanodots and nanoparticles are an important class of nanostructured magnetic materials. These structures are ideal candidates for important technological applications in spintronics, high density recording media, microwave electronics, permanent magnets, and for medical diagnostics and targeted drug delivery applications. These materials also represent an experimental playground for fundamental studies of magnetic interactions and magnetization mechanisms at the nanoscale level. One of the most interesting configurations to study is a periodic array of magnetic nanowires since both the size of the wires and their arrangement with respect to one another can be controlled. Inter-wire coupling in nanowire arrays is important because it significantly affects magnetization switching. The magnetic characterization of materials is usually made by measuring a hysteresis loop, however it is not possible to obtain information of interactions or coercivity distributions from the hysteresis loop alone. First-order-reversal-curves (FORC) provide a means for determining the relative proportions of reversible and irreversible components of the magnetization in arrays of magnetic nanowires. In this paper we will discuss the synthesis of magnetic nanowire arrays, the FORC measurement and analysis technique and present results for an array of nickel (Ni) nanowires.

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Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2014: Graphene, CNTs, Particles, Films & Composites
Published: June 15, 2014
Pages: 513 - 516
Industry sector: Advanced Materials & Manufacturing
Topic: Materials Characterization & Imaging
ISBN: 978-1-4822-5826-4