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Probe Recording in Magnetic Patterned Media
Abelmann, Leon,Siekman, Martin,Murillo, Rogelio,Groenland, J.P.J. (Hans) The Society of Information Storage Systems 2007 정보저장시스템학회논문집 Vol.3 No.2
In this paper we explain why future probe storage systems will use patterned media. As a model system, magnetic patterned media will be discussed, even though their data density is limited to about $7Tbit/in^2$. The first results on magnetic probe storage on patterned media are presented, and the problem of switching field distribution is discussed in detail. Finally we will present the first steps into two-dimensional coding for patterned media.
Magnetic Particle Spectrometry of Fe<sub>3</sub>O<sub>4</sub> Multi-Granule Nanoclusters
Pan, Lijun,Park, Bum Chul,Ledwig, Micheal,Abelmann, Leon,Kim, Young Keun IEEE 2017 IEEE transactions on magnetics Vol.53 No.11
<P>Magnetic particle imaging (MPI) is a novel high-resolution medical imaging method that does not use ionizing radiation, but safe iron oxide nanoparticles as contrast agents. By employing magnetite (Fe3O4) multi-granule nanoclusters (MGNCs), one has two control parameters: the diameter of the particles and that of granules in single particles. Here we investigate the effect of the size of the particles at constant granule size, as well as the effect of granule size at constant particle size on the magnetization reversal. The saturation magnetization Ms value increases with increasing granule diameter and particle diameter, while the coercivity Hc value reaches a maximum at a particle size of about 60 nm. MGNCs with an average particle size of 77 nm and granule diameter of 17 nm show a larger response in the higher harmonics compared to the commercial reference, FeraSpin R dispersion, at both 20 and 30 mT. This result demonstrates that the MGNC concept allows tailoring of the magnetic properties of the particles to the imaging conditions in MPI.</P>