Abstract
The experimental and theoretical situation regarding the coefficient
D
in the spin wave dispersion law for metals,
h
ω
q
=
Dq
2
, is briefly reviewed. Particular attention is paid to the correlation of
D
with other magnetic properties of metals and alloys such as the Curie temperature. A calculation of
D
is then reported for a simple cubic lattice to illustrate the factors influencing
D
, such as the effective interaction between the itinerant electrons and the number of electrons per atom. The correlation of
D
with the Curie temperature is also obtained for this model. On the basis of these results as well as those of Penn (1966) a test is made of the stability of the ferromagnetic ground state by considering a phase diagram relating the reduced effective interaction with the number of electrons per atom. The stability or instability is discussed separately for the several regions in this diagram. As a result it is concluded that Penn’s analysis of this problem may be insufficient in some cases and it is conjectured that the stability of the ferromagnetic ground state is determined by the sign of
D
.
Reference8 articles.
1. A ntonini B. Lowde R . D. & Stringfellow M. W . 1966 To be published.
2. Spin waves and the stoner criterion for weakly ferromagnetic alloys
3. P hys;Rev.,1966
4. Proc. P hys;Lowde R .;Soc.,1964
5. Rev. 1952 85 P hys
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