Some Magnetic Properties of Thin Ferromagnetic Films Exchange Coupled through Metallic Nonmagnetic Spacer

Urbaniak-Kucharczyk, A.

doi:10.1002/1521-3951(199709)203:1<195::aid-pssb195>3.0.co;2-f

Cited by 8 publications

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“…In order to take into account the roughness in the surface region in the same way as for the interface, the surface planes are approximated by diluted magnetic alloys with the effective nearest neighbours number z eff ¼ zð1 À rÞ; where z is the coordination number. Employing the Green function method [5] such magnetic properties as magnetisation distribution across the layer, the Curie temperature and the spin-wave parameter and their dependence on the spacer thickness have been determined.In the calculations the FCC nonmagnetic spacer with interaction parameters taken for Cu was considered [6]. …”

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Magnetisation distribution in magnetic bilayers with rough surfaces and interface

Urbaniak-Kucharczyk

Alvarado

2004

Journal of Magnetism and Magnetic Materials

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Magnetisation distribution in magnetic bilayers with rough surfaces and interface

Urbaniak-Kucharczyk

Alvarado

2004

Journal of Magnetism and Magnetic Materials

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“…Following the usual procedures of the Green function method [13,14] we write the equation for the magnetization in v-th layer where with where the form of Ε(ki, h) in the first order random phase approximation (RPA) and the system of equations determining ki are given in [15].…”

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Magnetic Characteristics of the System of Exchange Coupled Layers

Urbaniak-Kucharczyk

Machowski

2000

Acta Phys. Pol. A

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“…Numerical calculations have been performed for fcc nonmagnetic spacer with interaction parameters taken for Cu [3]. Results obtained show that positions and relative intensities of resonance lines change with the change of roughness parameter.…”

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“…In Fig. 2b the oscillatory dependence of Curie temperature calculated as a function of the spacer thickness for (111) nonmagnetic spacer and ideal bilayer [3] is compared with Curie temperature obtained for films with rough surface and interface. The results show decreasing fluctuation of investigated quantities for samples with rough surfaces and interface in comparison with dependencies obtained for films with ideal surfaces.…”

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“…P (q z ) plays the role of structural form factor due to the roughness i.e., the phase factor along the z direction averaged over the rough surface. In the present work χ(q z ) has been calculated in the single band approximation [3] and the form factor P (q z ) is approximated by the following function of interface roughness parameter r [4] P (q z ) = (1 − 2r) + 2r cos q z a 2 .…”

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Magnetic Properties of Exchange-coupled ?Bilayers? with Rough Surfaces and Interface

Urbaniak-Kucharczyk¹,

Staniucha²

2004

Czech J Phys

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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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Some Magnetic Properties of Thin Ferromagnetic Films Exchange Coupled through Metallic Nonmagnetic Spacer

Cited by 8 publications

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Magnetisation distribution in magnetic bilayers with rough surfaces and interface

Magnetisation distribution in magnetic bilayers with rough surfaces and interface

Magnetic Characteristics of the System of Exchange Coupled Layers

Magnetic Properties of Exchange-coupled ?Bilayers? with Rough Surfaces and Interface

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