| Original Articles |
|
|
|
|
ON THE MAGNETIC ANISOTROPY OF THE Co AND γ-Fe2O3 ULTRAFINE PARTICLES
|
| LUO Helie;SUN Ke;NIE xiangfu* |
| Institute of Physics, Academia Sinica, Beijing, 100080
*Hebei Normal University, Shijiazhuang, 050016
|
|
| Cite this article: |
|
LUO Helie, SUN Ke, NIE xiangfu 1990 Chin. Phys. Lett. 7 369-372 |
|
|
|
Abstract The anisotropy constants K of γ-Fe2O3, Co-γ-Fe2O3 and Co ultrafine particles precipitated in Cu-Co alloy have been measured by wing the equations for describing the relaxation of superparamagnetic particles. It is found that the anisotropy constant K of Co-γ-Fe2O3 fine particles is greater than that of γ-Fe2O3 by about 50%; the K value of Co ultrafine particles of a radius equal to 36Å is greater than that of to 48Å by about 100%. This phenomenon has been interpreted as the existence of surface anisotropy of the Co ultrafine particles.
|
| Keywords:
75.60.Jp
|
|
|
Published: 01 August 1990
|
|
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
