APPLICATION OF SPIN WAVE THEORY TO THREE MAGNETIC SALTS

Journal Article · Sun Dec 01 04:00:00 EST 1963 · Proc. Phys. Soc. (London)

DOI:https://doi.org/10.1088/0370-1328/82/6/319· OSTI ID:4133183

Low, G G

Numerical calculations, based on spin wave theory, were carried out in connection with the magnetic properties of two simple ferromagnetic salts, EuO and EuS, and the antiferromagnetic compound MnF/sub 2/. The resulting predictions regarding magnetization and specific heat were compared with experiment over a wide temperature range. The calculations envisage the possibility that more than one set of exchange interactions may be involved and in the case of MnF/sub 2/ allowance is made for a temperature dependent anisotropy field. Account is taken of two-magnon dynamical interactions and renormalized spin wave energies are used in evaluating the magnon populations. The effects of kinematical interactions between spin waves are, however, ignored. It is found that the theoretical estimates of magnetization appear to fit experiment over a temperature range extending to about three-quarters of the Curie or Neel temperature of the system concerned. Specific heat calculations, on the other hand, seem to depart from the experimentally observed values at a much lower temperature, of the order of one-third the critical temperature. The calculations on EuO and EuS confirm the general model for the exchange constants of these salts proposed by McGuire, Argyle, Shafer, and Smart and by Gorter and his co-workers. (auth)

• Research Organization: Atomic Energy Research Establishment, Harwell, Berks, Eng.
• NSA Number: NSA-18-005870
• OSTI ID: 4133183
• Journal Information: Proc. Phys. Soc. (London), Journal Name: Proc. Phys. Soc. (London) Vol. Vol: 82
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANISOTROPY
EUROPIUM OXIDES
EUROPIUM SULFIDES
FERROMAGNETIC MATERIALS
INTERACTIONS
LATTICES
MAGNETIC PROPERTIES
MAGNETISM
MAGNONS
MANGANESE FLUORIDES
NUMERICALS
PHYSICS
QUANTUM MECHANICS
SALTS
SPECIFIC HEAT
SPIN
SPIN WAVES
TEMPERATURE