Abstract
The mechanisms responsible for magnetic interaction between nanoparticles are described and modelled in the previous chapter of this book. Here, the collective superspin glass state resulting from such interaction is discussed, using a collection of experimental results. Superspin glasses display qualitatively similar dynamical magnetic properties as canonical spin glasses, including ageing, memory and rejuvenation phenomena. In the Introduction, the dynamical properties of spin and superspin glasses are illustrated and contrasted. These properties are discussed in more detail in Case studies, taking into account the nanoparticle concentration, size and size distribution, using results from studies of ferrofluids and compacts of γ-Fe2O3 particles. The Outlook section illustrates recent findings suggesting that the temperature dependence of the low-field isothermal remanent magnetization (IRM) and magnetization as a function of magnetic field (hysteresis or M-H) curves of superspin glasses include information on the superspin dimensionality and magnetic anisotropy. The possibility to engineer nanocomposites with tailored magnetic interaction and anisotropy is also discussed.
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Acknowledgements
The authors are grateful to all their co-workers. This chapter includes results obtained in collaboration with M. S. Andersson, G. Muscas, P. Anil Kumar, M. Hudl, as well as D. Peddis, G. Singh, J. A. de Toro and their respective groups. The Swedish Research Council (VR) is thanked for financial support.
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Mathieu, R., Nordblad, P. (2021). Collective Magnetic Behaviour. In: Peddis, D., Laureti, S., Fiorani, D. (eds) New Trends in Nanoparticle Magnetism. Springer Series in Materials Science, vol 308. Springer, Cham. https://doi.org/10.1007/978-3-030-60473-8_3
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