Short-range order in Valenta model of thin films

Zasada, I.; Busiakiewicz, B.; Wojtczak, L.

doi:10.1016/j.jmmm.2006.09.009

Cited by 8 publications

(9 citation statements)

References 10 publications

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“…In the very last case the Hamiltonian matrix is fivediagonal; thus we should take into account both surface parameters 1 and 2 , and simple conditions (7) and (8) for the surface localization are not valid anymore. This also means that the effective coupling between layers now extends up to the second-neighboring layer which is described by offdiagonal element 2 .…”

Section: Dynamic Surface Localizationmentioning

confidence: 99%

“…In Figure 4 we show two spin-wave spectra for fcc(110) thin film consisting of 11 layers without (panel (a)) and with (panel (b)) NNN interactions. In the first case (Figure 4(a)) there are two surface states emerging from the bulk band in some region of the SBZ (please notice that even if NNN interactions are switched off the matrix is five-diagonal and conditions (7) and (8) are not valid). If NNN interactions are taken into account (Figure 4 It is also worth noticing that each surface mode is localized at both surfaces.…”

Section: Dynamic Surface Localizationmentioning

confidence: 99%

“…Magnetic thin films are the subject of intensive studies, both experimental [1][2][3][4][5] and theoretical [6][7][8][9][10], for more than half a century. This interest is stimulated by two main reasons: the huge progress in the fabrication technology of such structures [11] and the rich physics they exhibit.…”

Section: Introductionmentioning

confidence: 99%

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Propagation Effects in the Spin-Wave Spectrum of the Ferromagnetic Thin Film

Mamica

2015

Advances in Condensed Matter Physics

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Exchange spin waves propagating in magnetic thin films exhibit some dynamic effects, that is, the effects caused solely by the wave propagation. In this paper we put our attention in four phenomena of such kind: the surface (and subsurface) localization, the collapse of the bulk band into a single energy level, the reversal of the mode order in the spin-wave spectrum, and the dynamic separation of the thin film into two subsystems. We link these effects to properties of Hamiltonian matrix elements inherited from the spatial distribution of neighboring spins with respect to the film surface. We also provide necessary conditions for the occurrence of these effects.

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Section: Dynamic Surface Localizationmentioning

confidence: 99%

Section: Dynamic Surface Localizationmentioning

confidence: 99%

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Propagation Effects in the Spin-Wave Spectrum of the Ferromagnetic Thin Film

Mamica

2015

Advances in Condensed Matter Physics

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“…Therefore, for more than half a century the magnetic thin film has remained the subject of keen interest, additionally stimulated by the immense progress in the measurement techniques and fabrication technology of such systems [6][7][8][9][10][11][12]. A particular class of phenomena is related to in-plane propagation of spin waves, i.e.…”

Section: Introductionmentioning

confidence: 99%

Dynamic effects on the spin-wave spectrum of the bcc thin film

Mamica

2014

Eur. Phys. J. B

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Abstract. In the present paper we consider a ferromagnetic thin film with exchange interaction between nearest and next-nearest neighbours. Using a microscopic model based on the Heisenberg Hamiltonian we investigate how the propagation parallel to the surface of the film affects the spin-wave spectrum. Due to its wave-vector dependence the effective coupling between lattice planes parallel to the surface can be of ferromagnetic or antiferromagnetic character, or it can vanish completely, depending on the propagation of spin waves. When the effective coupling vanishes, the film separates into subsystems in which spin waves propagate independently. Antiferromagnetic effective coupling for certain wave vectors implies reversed mode order in the spectrum (with the optical mode at the bottom and the acoustic one at the top). Interestingly, this effect occurs also when all the exchange interactions in the considered system are ferromagnetic.

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“…Next, different levels of extensions for the original Valenta model have been proposed in connection with its applicability for magnetic thin films description. The most important one is connected with the improvement of the entropy construction in the self consistent way when the correlations are taken into account [13]. Another kind of extension is connected with introduction of the reaction field instead of the standard molecular field.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Nano-Structures in Valenta Model

Zasada,

Busiakiewicz

2009

Preprint

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The ferromagnetic nano-structures are recently of great interest for modern investigations. A comparison of the experimental data and theoretical results shows that the use of the standard molecular field approximation is insufficient for the description of nano-structure properties. Therefore, we use the effective field approach in order to show the usefulness of the Valenta model generalized in this way. The agreement between experiment and theory is then excellent.The magnetization profiles and the calculated Curie temperatures are presented for the systems consisting of Ni and Co layers with different configuration of the surfaces and interfaces including terraces and wires. We have shown that the position in the system as well as the kind of neighbouring layers and their mutual interactions can determine the shape of magnetization profiles.The use of the Valenta model allows us to present all dependences in the layer resolved mode.

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Short-range order in Valenta model of thin films

Cited by 8 publications

References 10 publications

Propagation Effects in the Spin-Wave Spectrum of the Ferromagnetic Thin Film

Propagation Effects in the Spin-Wave Spectrum of the Ferromagnetic Thin Film

Dynamic effects on the spin-wave spectrum of the bcc thin film

Ferromagnetic Nano-Structures in Valenta Model

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