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Magnetic nanoparticles reveal unique magnetic properties and relaxation phenomena which make them relevant for data storage, electronic and mechanical engineering, and biomedical applications1,2. Whereas the implementation of nanomagnetic properties into technological applications is progressing rapidly, understanding the microscopic origin of phenomena such as magnetization enhancement or decrease, magnetic anisotropy and the related magnetization distribution in individual nanoparticles, and interparticle interactions leading to aggregation or even ordered assemblies of nanoparticles is fundamentally challenging and needs intensive research. Polarized neutrons are an excellent, microscopic probe for spatial and time-resolved studies of magnetism. In this contribution, I will present examples of our recent studies of magnetic nanoparticles on different scales, ranging from atomic magnetic structures to the mesoscale intraparticle magnetization, and interparticle interactions in well-ordered arrays of magnetic nanocubes. References: [1] S. D. Bader, Rev. Mod. Phys. 78, 1 (2006); DOI: 10.1103/RevModPhys.78.1 [2] Q. A. Pankhurst et al., J. Phys. D: Appl. Phys. 36, R167 (2003); DOI: 10.1088/0022-3727/36/13/201

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Sabrina Disch, Department Chemie, University of Cologne
Seminar Room of the Institute of Physics 2
Contact: P. v. Loosdrecht