On the pinning of magnetic domain walls by lattice defects in Ni and Ni-alloys

Vacancy-Impurity Interaction during and after Quenching of Ni-5 wt% Mn Alloy

“…4) seemed to be the outcome of two mechanisms having opposite effects on x,,, and H,,, namely, the release of vacancies from impurity traps formed during quenching and their subsequent agglomeration at deeper traps in complex aggregates or microscopic voids at higher annealing temperatures [ 181. The latter process seemed to impose a heavily pinning action on the magnetic domain walls, preventing them from normal detachment from fixation points and leak out the magnetic pressure exerted by the magnetic field on domain walls [7]. This effect tends to decrease the maximum magnetic susceptibility (x,,,) while increasing the magnetic coercivity (Her), which was actually observed in this stage (see Fig.…”

Gradually Devitrified Co-Based Metallic Glass As a Model Material for Testing Néel's Theory of the Rayleigh Rule

“…Comparison of the experimental and calculated values of the parameter p is usually considered as a practical numerical test for the validity of the model used by Neel. However, the experimental values of this parameter, measured till now for numerous monoand poly-crystalline soft and hard magnets, are much larger than those expected from Néel's theory (see, e.g., [4][5][6]). For example, in the experiment performed by Porteseil [4] on Fe-Si single crystal rectangular frames, each containing a single active Bloch wall, the value of the parameter p was obtained as 260 which is more than two orders of magnitude larger than the expected value of 1.6.…”