Theoretical single-domain size of NiZn ferrite

The critical radical, Rc, below which a spherical particle of NiZn ferrite becomes a single domain in zero applied field, is computed by minimizing the energy under the only constraint that the magnetization configurations have a cylindrical symmetry. The rigorous result for an isolated particle is Rc = 22.3 nm. Several theories are used to correct for the soft environment of closely-packed particles, thus increasing Rc up to 0.727 µm. This value, however, is still too small to account for the experimental value of 1.4 ± 0.05 µm in NiZn ferrite, which means that the problem of the effect of the soft environment needs a more careful theoretical study

MAGNETIC STRUCTURE IN OBLIQUELY DEPOSITED Co-Au FILMS

Les couches minces de Co-Au de différentes compositions, déposées obliquement sous incidence de 40° et 60°, ont été étudiées. Les couches se caractérisent par un facteur de qualité Q > 1 ; les domaines en rubans "forts" se manifestent dans tous les échantillons ; les rubans faibles ont aussi pu être observés dans quelques couches déposées sous l'angle 40°.The magnetic properties and domain structure of Co-Au films of various compositions, deposeted at angles of incidence of 40° and 60° have been studied. Values of Q ranged from just under to well over 1. Strong stripe domains were obdserved in all specimens. Some specimens contained weak stripe domains as well

Magnetism and magnetic materials

SIGLEAvailable from British Library Document Supply Centre- DSC:88/04345(Magnetism) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

AN FIM-ATOM PROBE AND TEM STUDY OF ALNICO PERMANENT MAGNETIC MATERIAL

Alnico 8 specimens have been studied both in the thermomagnetically aged and further heat treated condition using the field ion microscope (FIM) and high voltage electron microscope. The results are compared with those produced by Hetherington et al., [1] on Alnico 5 and Zhu et al., [2] on Alnico 8

Magneto-acoustic and Barkhausen emission in ferromagnetic materials

Available from British Library Document Supply Centre- DSC:9091.9F(AERE-R--11876) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo