Inverted near-surface hysteresis loops in annealed Fe80.5Nb7B12.5 ribbons

Magnetic-field behavior of heterogeneous magnetic materials

“…At last, one can note that we had also observed the abnormal MOKE hysteresis loops (up to partially and completely inverted hysteresis loops) for the annealed at T ¼ 380-550 1C Fe 80.5 Nb 7 B 12.5 ribbons [10][11][12]. The bulk hysteresis loops of these ribbons (in contrast to the thin-film Co/Ni/Fe and Fe/Zr/Fe samples) had the usual forms.…”

Abnormal near-surface magnetic properties of heterogeneous (amorphous/nanocrystalline) Fe80.5Nb7B12.5 ribbons

“…1b) inverted. We have explained this phenomenon by considering a two-phase model with two nonidentical phases, both having uniaxial anisotropy, and interface antiferromagnetic exchange between those [17].…”

Local magnetization profile and geometry magnetization effects in microwires as determined by magneto-optical Kerr effect

“…[18][19][20][21][22] Such unusual loops are interpreted considering either magnetostatic or exchange interaction between layers with non-identical magnetic phases (i.e., both having uniaxial in plane anisotropy or even ferro/antiferro character). In the present case, inverted loops are a consequence of the strong local demagnetizing fields.…”

“…[16][17][18][19][20][21][22] To understand it, we should consider that the measured loop actually represents magnetization against applied magnetic field, where the presence of additional field component, particularly local demagnetizing fields, is not taken into account. In our present case of thick wires, the local inverted loops in the region, close but not at the very end of the microwires, denote the existence of a significant local redistribution of magnetic moments.…”