Magnetic measurements on single acicular particles of γFe2O3
- 1 January 1980
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 16 (1) , 62-67
- https://doi.org/10.1109/tmag.1980.1060543
Abstract
Measurements of the remanent coercive force Hrhave been made upon large numbers of individual 'tape' particles of &Fe2O3. The greatest range of values of Hrsound for any one sample was 300<Hr<1100 0e, and other samples of different origins gave rather similar results. Using the data for two sets of samples, together with other known factors, the remanent loops of the corresponding tapes were synthesized. The synthesized loops resembled the experimental loops, but the remanent coercive forces were larger by 20 to 60 0e: very good agreement was obtained for one sample. The effect of a.c. demagnetization was investigated. This showed that particles of the highest Hrwere undoubtedly single, but that many of lower Hrwere multiple. Particles of similar morphologies have been observed in recording tape. A value for Hrof 1100 0e is shown to be consistent with the magnetization reversing by the buckling process.Keywords
This publication has 5 references indexed in Scilit:
- Measurements on single magnetic particlesIEEE Transactions on Magnetics, 1978
- On the Coercivity of γFe2O3 ParticlesJournal of Applied Physics, 1967
- Angular Variation of the Magnetic Properties of Elongated Single-Domain Iron ParticlesJournal of Applied Physics, 1960
- Critical Size and Nucleation Field of Ideal Ferromagnetic ParticlesPhysical Review B, 1957
- An Approach to Elongated Fine-Particle MagnetsPhysical Review B, 1955