The model of ferromagnetism which can be considered as a generalization of the Heisenberg, Stoner, and modified Zener models is applied to the case of thin magnetic films. Calculations are presented within the frame of a Green function formalism of the magnetization distribution across the layer and the thickness dependence of the Curie temperature. The case of h.c.p. thin films with strong surface anisotropy in the high-temperature region has been discussed in detail.

The model of indirect interaction between localized spins via conduction electrons in thin magnetic films is applied to the calculation of the interlayer exchange coupling parameter. The case of the spacer layer of f.c.c. structure is analyzed in detail. The oscillatory character of the exchange coupling parameter as a function of the spacer thickness as well as of the thickness of the magnetic layer is found for various orientations of the spacer.

No abstract

The magnetic contribution to the specific heat of thin ferromagnetic films is discussed. The numerical calculations made for the special case of S.C. crystallographic lattice and 8 = 112 reveal that the specific heat is larger in thin films than in bulk materials in contrary to the behaviour of another properties, e.g. magnetization or electrical resistivity.Der magnetische Beitrag zur spezifischen Wlrme dunner ferromagnetischer Schichten wird diskutiert. Numerische Rechnungen fiir den Spezialfall des simplen kubischen kristallographischen Gitters und S = 112 zeigen, daB die spezifische Wirme in diinnen Schichten groBer als im Volumenmaterial ist, im Gegensatz zu anderen Eigenschaften, wie Magnetisierung oder elektrischer Widerstand.

The thin diluted ferromagnetic film with sc symmetry is considered in the thirdorder Matsudaira approximation. The equations for the description of magnetisation and various correlation functions have been derived and the results of the numerical calculations have been presented. In particular the critical temperature, the critical concentration, the magnetisation and various correlation functions are discussed in detail for various film thicknesses and for several magnetic atom concentrations.

No abstract

No abstract

System of two magnetic layers with nonuniform distribution of anisotropy parameter and exchange coupled by nonmagnetic spacer is studied by means of the Green function approach. Our attention is focussed on the elementary excitations and low temperature magnetisation behavior. The spin wave parameter B in the Bloch law T 3/2 is found as an oscillatory function of a spacer thickness. The eects of damping leading to non-zero line-width of ferromagnetic resonance peaks are also taken into account. As a result the dependence of resonance line-width on parameters characterizing system under consideration is obtained for the case of uniform anisotropy parameter and for quadratic distribution of this parameter in magnetic layers, respectively.