Title :
Effects of "Chain-of-Spheres" configurations on magnetic properties for fine α-Fe. particles. II. Study on intergrain-misfitting effect
Author_Institution :
Mitsui-Toatsu Chemicals Inc., Yokohama-City, Japan
fDate :
9/1/1987 12:00:00 AM
Abstract :
For fine α-Fe particles prepared from acicular α-FeOOH.particles industrially, intergrain-misfitting effects (taken as a concept of "crystalline-defects") were numerically studied by a "Chain-of-Spheres" Fanning-Model[:CSFM]. CSFM is based on an "interaction-anisotropy" developed by Jacobs and Bean and modified recently by the author to apply to various types of particle-morphology. Theoretical results are compared with experiments. It is shown that the introduction of "crystalline-defects" into the theory provides linear decreasing of coercivity for the chain aligned along an external field and its smooth angular-variation. This trend explains the experimentally-observed behaviour for very fine α-Fe.particles. An application of the model theory for multigrain-type particles is discussed and compared with experimental results.
Keywords :
Magnetic recording; Chemicals; Crystallization; Crystallography; Iron alloys; Jacobian matrices; Magnetic anisotropy; Magnetic properties; Perpendicular magnetic anisotropy; Surface morphology; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1987.1065564