α”-Fe16N2 has been emerging as one of promising candidates of rare-earth free permanent magnet because of its large magnetocrystalline anisotropy (Ku > 1.0 × 107 erg/cc), and large saturation magnetization (4πMs > 2.4 T). An integrated synthesis technique is developed, including a direct foil-substrate bonding step, an ion implantation step and a two-step post-annealing process.
K. Wu, J. P. Wang, and co-workers reported a characterization technique to measure the saturation magnetization of magnetic nanoparticles in liquid phase directly. Besides, this technique predicts the average hydrodynamic size, the dominating relaxation processes of particles, and the distinction between single- and multicore particles. It can be applied as building blocks in nanoparticle characterization devices. [Read More]
A simple and sensitive method for the detection of influenza A virus based on giant magnetoresistance (GMR) biosensor is developed. This assay employs monoclonal antibodies to viral nucleoprotein (NP) in combination with magnetic nanoparticles (MNPs). Presence of influenza virus allows the binding of MNPs to the GMR sensor and the binding is proportional to the concentration of virus. Binding of MNPs onto the GMR sensor causes change in the resistance of sensor, which is measured in a real time electrical readout.