Abstract
The anomalous magnetic aftereffect (AMAE) is a non-monotonic time dependence of the magnetization of a ferromagnetic material for constant thermodynamic parameters such as temperature and external magnetic field. The first observations of AMAE made for a-Fe(C) many years ago were attributed to the reversible aftereffect associated with the diffusion of C-atoms in Fe. However, the reversible aftereffect is not typical for permanent magnet materials. We measured the time dependence of magnetization of the two-phase permanent magnet Nd4Fe77B19 for different magnetic prehistories. Depending on the prehistory the magnetic viscosity S can be positive as well as negative, even for the same “coordinate”, (J,H), i.e. the system does not always move directly towards the thermal equilibrium state. In particular the samples spontaneously remagnetize after being field demagnetized. The driving force for this effect may be similar as that for thermal remagnetization. For certain magnetic prehistories we find the AMAE, i.e. the magnetization J(t) can not always be described by a formula S ln(1 + t/to). This observation as well as the effects of spontaneous remagnetization will be discussed in terms of magnetic interactions.
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Müller, KH., Wolf, M., Handstein, A., Eckert, D., Andrikidis, C., Collocott, S. (1997). Anomalous Magnetic Aftereffect. In: Hadjipanayis, G.C. (eds) Magnetic Hysteresis in Novel Magnetic Materials. NATO ASI Series, vol 338. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5478-9_24
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DOI: https://doi.org/10.1007/978-94-011-5478-9_24
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