CALCULATION OF MAGNETIZATION VS TEMPERATURE CURVES FOR FERRIMAGNETIC MATERIALS
Abstract
The equations implicit in Neel's molecular-field theory of ferrimagnetism are set out in con siderable detail. The general equations which pertain to magnetic structures th crystallo graphic long-range order are derived, and the specific pair of transcendental equations which must be satisfied in the case of two sets of antiparallel magnetic spins is written down in a form which is amenable to solution by automatic computer methods. The dominant interaction is expressed in terms of the magnetic transition temperature, while the two smaller interactions are given as fractions of the dominant one. A computation of the shapes of the curves of the magnetization as a function of temperature shows that, while magnetic and neutron diffraction measurements can determine quite precisely the value of a linear function of these fractions, the actual values of the individual fractions are less precisely determined. It follows than any experimental deviation from the calculated curves is due to an inadequacy of the theory rather than to incorrect values of the parameters. Finally, methods of attack for computation of more complex cases are discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1963
- Accession Number
- AD0407420
Entities
People
- E. Prince
Organizations
- United States Naval Research Laboratory