Abstract
The method of spin-wave theory is used to study the magnetic properties of layered Heisenberg ferrimagnets. The internal energy and specific heat per site are calculated for different interlayer coupling strengths and temperatures. In the low temperature region θ (= K B T/6J) « θ 1 (= (2 + δ)/3), a characteristic temperature θ o = δ is given (δ is the ratio of ferrimagnetic interplanar coupling to planar coupling), the asymptotic expressions of internal energy anti specific heat are obtained for θ » θ o and θ « θ o , respectively. It is shown that the interlayer coupling has an important effect on the magnetic properties of ferrimagnets.
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