The magnetic contribution to specific heat in thin ferromagnetic films

Wojtczak, L.; Urbaniak-Kucharczyk, A.; Mielnicki, J.; Mrygoń, B.

doi:10.1002/pssa.2210760112

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…We now introduce the k-space which is usually considered in the case of the thin film geometry [22]. We assume the usual notation, k for 3D systems and h for 2D subsystems so that k = (τ, h) where τ labels the subsystems.…”

Section: The Basic Concept Of the Reaction Field Approachmentioning

confidence: 99%

“…The details of T α ν j τ h transformation are discussed in [22]. Now, we present the detailed calculations leading to the expressions for λ and other quantities which are necessary to describe our system.…”

Section: The Basic Concept Of the Reaction Field Approachmentioning

confidence: 99%

“…For the coefficients T ντ we have the well-known equations [22] T ν+1,τ + T ν−1,τ = (2 cos ϑ τ ) T ντ for ν = 2, 3, . .…”

Section: The Basic Concept Of the Reaction Field Approachmentioning

confidence: 99%

“…Then the Green function approach allows us to obtain the average value of spin component z, i.e. S z ν , given by (A.9) where H m ν takes now its value (6) with λ given by (22) where s and G(s) are given by ( 20) and ( 21), respectively.…”

Section: Appendix a Green Function Approachmentioning

confidence: 99%

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Ferromagnetic nanostructures in the generalized Valenta model

Busiakiewicz¹,

Zasada²,

Wojtczak³

2008

J. Phys.: Condens. Matter

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Ferromagnetic nanostructures are an area of great interest for modern physics. A comparison of experimental data and theoretical results shows that the use of the standard molecular field approximation is insufficient for the description of the nanostructure properties. Therefore in the present paper we use the reaction field approach in order to test the Valenta model generalized in this way. The agreement between experiment and theory is then excellent.

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Section: The Basic Concept Of the Reaction Field Approachmentioning

confidence: 99%

Section: The Basic Concept Of the Reaction Field Approachmentioning

confidence: 99%

“…For the coefficients T ντ we have the well-known equations [22] T ν+1,τ + T ν−1,τ = (2 cos ϑ τ ) T ντ for ν = 2, 3, . .…”

Section: The Basic Concept Of the Reaction Field Approachmentioning

confidence: 99%

Section: Appendix a Green Function Approachmentioning

confidence: 99%

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Ferromagnetic nanostructures in the generalized Valenta model

Busiakiewicz¹,

Zasada²,

Wojtczak³

2008

J. Phys.: Condens. Matter

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“…It can be noted that in the case of S = 112 (6) can be written in the simple form [15] tgh[ (3/P)1/2 sin a ] ' -2 for T < T,(n, c ) and G = 112 for T > T,(n, c ) .…”

Section: Spin Autocorrelation Timementioning

confidence: 98%

Mössbauer lineshape in the case of diluted ferromagnetic alloy thin films

Urbaniak-Kucharczyk

Osetek

1989

Physica Status Solidi (b)

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A. URBANIAK-KUCHARCZYK and Z. OSETEKThe theory of Mossbauer line shape in fluctuating environment is applied to the case of thin film of a diluted alloy. The distribution of the spin autocorrelation time characterizing the line shape in the vicinity of phase transition point across the sample is calculated. It is shown that the change of concentration of magnetic atoms in diluted alloys leads to a variety of Mossbauer spectra a t the same sample temperature. All the results obtained are calculated for the particular case of S = 1/2 and for a film with b.c.c. lattice, aIthough another crystallographic Iattices may be consider as well.Die Theorie der MoBbauer-Linienform in fluktuierenden Systemen wird auf dunne Schichten aus verdunnten ferromagnetischen Legierungen angewandt. Die Auto-Spinkorrelationszeit, die die Linienform in der Umgebung des Phaseniibergangs charakterisiert, wird in Abhangigkeit von der Schichtdicke berechnet. Es wird gezeigt, daB bei fester Probentemperatur die b d e r u n g der Konzentration der magnetischen Atome in der ferromagnetischen Legierung zu verschiedenen MOBbaner-Spektren fuhrt. Die erhaltenen Ergebnisse werden fur den speziellen Fall S = 1/2 und fur ein k.r.z.-Gitter berechnet, obwohl auch andere Gittertypen einbezogen werden konnen. IntroductionThe effect of time-dependent perturbations on the lineshape of Mossbauer y-rays has been actively investigated since the work of Bradford and Marshall [l]. Special attention was payed to the region of temperatures not far from the critical temperature of magnetic samples 12 to 41.Recently the problem of magnetic properties of diluted ferromagnetic alloys is of great interest [5 to 71. The object of the present paper is the extension of earlier theoretical results concerning thin magnetic films as well as diluted alloys for the case of the Mossbauer lineshape. Spin Autocorrelation TimeTime-dependent or dynamic properties of magnetic samples in the vicinity of a phase transition point are related to spin fluctuations which can be detected in the Mossbauer experiment because they induce corresponding fluctuations in the hyperfine field. This in turn leads to the Mossbauer line broadeningif the field fluctuations are either too fast or too slow. The fundamental property of interest here is the spin autocorrelation time describing the shape of a Mossbauer line [l, 8,

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Synthesis and characterization of a three-dimensional framework built up of paradodecatungstate-B clusters and transition metals as linkers

Yang

Zhang

et al. 2012

Struct Chem

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The magnetic contribution to specific heat in thin ferromagnetic films

Cited by 5 publications

References 3 publications

Ferromagnetic nanostructures in the generalized Valenta model

Ferromagnetic nanostructures in the generalized Valenta model

Mössbauer lineshape in the case of diluted ferromagnetic alloy thin films

Synthesis and characterization of a three-dimensional framework built up of paradodecatungstate-B clusters and transition metals as linkers

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