On the modelling of the anhysteretic magnetization of soft magnetic materials

SILVEYRA JM; CONDE GARRIDO JM

New Orleans, Los Angeles, USA

Congreso; 2022 MMM-Intermag Joint Conference; 2022

We present a simple anddeterministic method for finding the modelling parameters of the single andeven the double-Langevin-Weiss function.Contrary to what has previously beenassumed, the single-Langevin-Weiss function can provide a good description ofany homogeneous material, even nanocrystalline alloys with strong transverseuniaxial anisotropy (Fig. 1). The overlooked key is to allow the Weissmolecular field to be negative.For non-homogeneous soft magnets, weshow that the anhysteretic magnetization can accurately be described by thedouble-Langevin-Weiss function, corresponding to two sets of magnetic moments. Themodel is accurate not only for materials exhibiting a double-peak semi-logmagnetization derivative curve (such as in grain-oriented steels in theirrolling direction), but even for materials with a double-peak differentialsusceptibility curve (such as in silicon steels under compressive stress, Fig.2). The overlooked key for the latter case, is to allow an antiferromagnetic arrangementof both sets of moments.