Experimental investigation of μ*-effect near the grain boundaries in grain-oriented silicon steel sheets

Influence of grain boundaries on orientation of spontaneous magnetization inside domains in the Fe-3%Si ferromagnetic sheets

“…The grain boundaries play an important role in the formation of magnetic properties and domain structure of polycrystalline ferromagnetics [1][2][3]. In particular, net magnetization and core losses inside grains in grain-oriented silicon steel sheets become inhomogeneous [4][5][6]. One of the main reasons of this influence, parallel with varying texture from grain to grain [4], is magnetostatic field H m , generated by the grain boundaries [1,2,4].…”

“…One of the main reasons of this influence, parallel with varying texture from grain to grain [4], is magnetostatic field H m , generated by the grain boundaries [1,2,4]. Under the H m action, the vectors M S can deviate from the easy directions near the grain boundaries (µ * -effect) even in materials of Fe-3%Si type with comparably large magnetic crystallography anisotropy constant K 1 [1,5,6]. Previously, an appearance of such magnetostatic effects near the grain boundaries was expected also in saturated state [5].…”

“…without formation of flux-closure structures near the boundary. Such an ideal domain structure (the perfect domain continuity) [1,2,6,7] forms inside grains of investigated material at comparably small values of imaginary magnetic charges:…”