Accidental printing effect of magnetic recording tapes using ultrafine particles of acicular γ-Fe2O3
- 1 December 1970
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 6 (4), 808-811
- https://doi.org/10.1109/tmag.1970.1066988
Abstract
Five kinds of acicular &-Fe2O3powder of which axial length varies from 0.17 to 0.80 &m with almost the same axial ratio are manufactured. The variance of coercive force and printing effect as the average axial length of the particles varies is shown. Coercive force of which particle axial length is about 0.35 &m shows maximum value. The printing effect increases according to the decrease of axial length. The printing effect increases with contacting time. The temperature dependence of coercive force and remanent magnetization are measured from 25 to 200&C. These two properties decrease as the temperature increases, but the decreasing inclination becomes steeper as the axial length is smaller. The relationship between the printing effect and the decreasing inclination of coercive force is nearly linear. From the temperature dependence of the printing effect, the activation energy of the printing effect can be calculated. The activation energy of the smallest particle is about 0.05 eV and the others are about 0.15 eV. This measured activation energy is discussed in connection with the relaxation equation.Keywords
This publication has 3 references indexed in Scilit:
- Influence of Crystallite Size on the Magnetic Properties of Acicular γ-Fe2O3 ParticlesJournal of Applied Physics, 1968
- Quantitative Determination of the Interaction Fields in Aggregates of Single-Domain ParticlesJournal of Applied Physics, 1961
- Virtues and Weaknesses of the Domain ConceptReviews of Modern Physics, 1945