Magnetic Materials: Novel Nanostructured Rare‐Earth‐Free Magnetic Materials with High Energy Products (Adv. Mater. 42/2013)
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The development of new magnetic materials is of paramount importance to surmount significant worldwide challenges in energy and environmental security. On page 6090, David J. Sellmyer, Balamurugan Balasubramanian, and co-workers report a novel hybrid nanomagnetic material having the highest energy product for permanentmagnet materials free of critical rare-earth elements or expensive Pt. This is achieved in a single-step process by assembling the easy-axis aligned high-anisotropy nanoparticles with a high-magnetization soft Fe-Co phase.Basal plane
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Magnetic nanoparticles (MNPs), including those of transition metals, such as iron oxide nanoparticles, cobalt oxide nanoparticles, and ferrite nanoparticles with diameters between 3 nm and 34 nm have been developed by a wet chemical method. These MNPs were modified with the functional groups, and introduced into cancer cells. SiO2-shelled ferrite nanoparticles have been discussed for the use in hyperthermia treatments on the basis of measurements of their AC magnetic susceptibilities.
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A permanent vertical magnetization should be obtained to counteract induced vertical magnetization due to the earth's background field during the Flash D demagnetization process. A vertical susceptibility is needed to calculate a extra-permanent magnetization, which is needed to control the permanent vertical magnetization in stage 2 of Flash D demagnetization and added to the final vertical permanent magnetization. Two susceptibilities were found in this paper. One is obtained from the extra-magnetization. The other is obtained by magnetic field measurement from the scaled physical vessel when the vessel is excited by vertical magnetic field. The initial susceptibility by the extra-magnetization was 0.101~0.109 and the one from the measured magnetic field was 0.122. Two susceptibilities have a good agreement each other. From this paper, it is found that the susceptibility is able to appllied to calculate the extr-magnetization.
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We present a simple polymer-mediated process of assembling magnetic FePt nanoparticles on a solid substrate. Alternatively absorbing the PEI molecule and FePt nanoparticles on a HO-terminated solid surface leads to a smooth FePt nanoparticle assembly with controlled assembly thickness and dimension. Magnetic measurements show that the thermally annealed FePt nanoparticle assembly as thin as three nanoparticle layers is ferromagnetic. The magnetization direction of this thin FePt nanoparticle assembly is readily controlled with the laser-assisted magnetic writing. The reported process can be applied to various substrates, nanoparticles, and functional macromolecules and will be useful for future magnetic nanodevice fabrication.
Nanodevice
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