The system of two magnetic (M) layers divided by nonmagnetic (N) spacer is considered. Roughness in interface region is introduced employing model proposed by Bruno and Chappert. Presence of roughness leads to modification of interface exchange parameter and interface anisotropy in comparison to samples with ideal interface. The magnetisation distribution and Curie temperature has been calculated using Green function formalism for systems consisting of Fe or Co standing for M and Cu or Au standing for N, respectively. Parameters corresponding to GaAs have been taken into account to characterize the substrate. The results obtained show decreasing of Curie temperature and shift of magnetisation curve with increasing of roughness parameter.
The effect of change of basic magnetic properties with introduced roughness of surface and interface regions of magnetic exchange-coupled bilayers is investigated. PACS : 75.60; 75.70 In the last decade, properties of metallic multilayers consisting of alternating magnetic and nonmagnetic layers have generated a great deal of interest because of growing technological importance in view of applications of such materials for information storage, magnetic heads and propagation elements and developments in experimental techniques. Experimental studies have revealed correlation between magnetic properties of layered systems and quality of their surfaces and interface[1]. However, little theoretical work has been devoted to the investigation of the influence of roughness of internal surfaces and interface on the observed properties of magnetic layered systems. In this paper we show, employing simple models of surface and interface roughness, in what way the basic characteristic of exchangecoupled magnetic bilayers with rough surfaces and interface change in comparison to the same properties calculated for the systems with ideal surfaces.We investigate properties of the system consisting of two ferromagnetic layers separated by a metallic nonmagnetic spacer. The thickness of each ferromagnetic layer is equal to N monatomic planes. We assume that the interaction between spins in lattice sites (ν, j) and (ν , j ) includes the nearest-neighbour exchange term, the anisotropy term and the Zeeman Hamiltonian, namelywhere ν ∈ (1, 2N ) denotes the number of monatomic plane and j defines the position of lattice point in the plane ν. H eff is the sum of the external uniform field oriented perpendicularly to the surface and the demagnetising field. We assume that the exchange parameter J νjν j is either equal to the exchange parameter J for bulk medium if νν ∈ (1, N − 1) and (N + 2, 2N ) or it is equal to the parameter * ) Presented at 12
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