https://doi.org/10.1140/epjp/s13360-025-06467-x
Regular Article
Anomalous excess loss in soft magnetic composites
Departament de Física, Universitat Autònoma de Barcelona, 08193, Bellaterra, Barcelona, Spain
Received:
3
March
2025
Accepted:
23
May
2025
Published online:
14
June
2025
The AC loss W per cycle per unit volume of soft magnetic composite samples consisting of soft ferromagnetic particles partially insulated among them is often considered as a sum of hysteresis loss 
, classical loss 
, and excess loss 
. Analyzing the measured frequency dependence of excess loss 
at a given amplitude of flux density 
using widely accepted formulas proposed for soft ferromagnetic sheets results in extremely large number 
of active magnetic objects at 
and extremely small parameter 
relating to the distribution of pinning fields to these objects. Careful analysis and conceptual discussion are presented in this paper to explain the anomalous excess loss in such samples. Being derived under non-physical assumptions, the mentioned formulas for excess loss of soft magnetic composites are conceptually questioned.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
