Back to Search
Start Over
(Keynote Paper) Mono-Domain Ferrites and Their Implications
- Source :
- IEEE Transactions on Magnetics. 56:1-7
- Publication Year :
- 2020
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2020.
-
Abstract
- Neutron depolarization experiments have shown that the intragranular magnetic domain structure of polycrystalline ferrites exhibits a marked grain size dependence. Below a grain size of around $3~\mu \text{m}$ , the magnetic domain structure changes from the two-domain to the mono-domain state. Ferrites composed of mono-domain grains exhibit low dissipation at megahertz frequencies. This is attributed to the absence of intragranular domain wall movement, i.e., a microscopic origin for dissipation in ferrites has been identified. The implications of this clear observation and evidence for a transition from the mono- to two-domain state in ferrites for micromagnetic theory when a single particle becomes monodomain, as well as for the initial permeability mechanisms in polycrystalline ferrites, are discussed.
- Subjects :
- 010302 applied physics
Materials science
Condensed matter physics
Magnetic domain
Dissipation
01 natural sciences
Grain size
Electronic, Optical and Magnetic Materials
Domain wall (magnetism)
0103 physical sciences
Domain (ring theory)
Particle
Neutron
Crystallite
Electrical and Electronic Engineering
Subjects
Details
- ISSN :
- 19410069 and 00189464
- Volume :
- 56
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Magnetics
- Accession number :
- edsair.doi...........fbe294d90859f498d1d28398c7519674