Experimental Determination of the Magnitudes of the Elemental Magnetic Domains of Nickel and Iron. Directional Coagulation of Aerosols II (1) (Experimentelle Bestimmung der GroeBe der magnetischen Elementargebiete von Nickel und Eisen. Gerichtete Koagulation von Aerosolen II (1)),
Abstract
While the characteristics of dia- and paramagnetism can be explained almost completely from the magnetic properties of the single atoms, the characteristics evident with ferromagnetic materials (size, field dependent value of the permeability, appearance of hysteresis phenomena, and a Curie temperature) can be understood only if the mutually alternating effects between adjacent atoms are conisdered. There are no 'ferromagnetic' atoms, but ferromagnetic phenomena appear only when there is a multitude of atoms in a particular geometric arrangement. In the classical theory of ferromagnetism, which was developed essentially by P. WEISS, it is assumed that the moments of the individual atoms of small regions (elemental domains) will act together in the same direction because of the mutual relations between the atoms. The moments of the elemental domain that arise in this way though, cancel themselves out by their mutually random directions in a crystal, so that in the absence of an external field it does not show any magnetic moment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 09, 1978
- Accession Number
- ADA053514
Entities
People
- August Winkel
- D. Beischer
Organizations
- Office of Naval Intelligence