The size effect in the equation of state for nanostructures

Warda, K.

doi:10.1088/0953-8984/21/34/345301

Cited by 6 publications

(7 citation statements)

References 35 publications

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“…From both approaches, differences in the ν exponent of Fe 0.5 Mn 0.1 Al 0.4 nanoparticles with respect to that of the pure Ising model agree with Harris and Fisher arguments. Finally, we want to stress that, even though thermodynamical models can be indeed used in the study of nanostructures [56] and they can reproduce experimental features, special attention must be paid regarding critical behavior depending on the approximations of the model.…”

Section: Discussionmentioning

confidence: 99%

Pseudocritical behavior of ferromagnetic pure and random diluted nanoparticles with competing interactions: Variational and Monte Carlo approaches

et al. 2011

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phases that can be found such as ferromagnetic, antiferromagnetic, superparamagnetic, cluster glass, SG and RSG depending on stoichiometry, microstructure, degree of dilution, atomic disorder, magnetic field and temperature. Typical Ising spin glass systems like those based on FeAl [6,7,9,20] and FeMnAl [11,12,15] are good candidates to study SG and RSG related properties through Isingbased theoretical models where good agreement with experimental results has been achieved. In particular, pure SG and RSG behaviors, in ternary FeMnAl alloys, arise from several ingredients including random atomic distribution of the alloy constituent elements in the crystalline structure, dilution provided by Al atoms giving rise to bond randomness and, finally, competition among the different exchange integrals involved. On this last respect, competition is given, essentially, by the difference

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Section: Discussionmentioning

confidence: 99%

Pseudocritical behavior of ferromagnetic pure and random diluted nanoparticles with competing interactions: Variational and Monte Carlo approaches

et al. 2011

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“…The mean value of magnetization m for the inhomoge-neous system for a thin solid film with the thickness n of monoatomic layers can be expressed [1] by…”

Section: Description Of Model and Resultsmentioning

confidence: 99%

“…For thin layers the magnetization exhibits the dependence on the number of monolayers in the F M layer. When the number of F M layers increases, the magnetization tends towards the bulk value for the 3D system [1]. The transport properties were examined by means of the equivalent network of resistors for an Fe/Cr/Fe/Cr four layer cells and the equation of state.…”

Section: Discussionmentioning

confidence: 99%

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The Magnetic Equation of State and Transport Properties in Reduced Dimensions

Warda

Wojtczak

2017

Acta Phys. Pol. A

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Basing our considerations on magnetic equation of state applied to the description of magnetic systems of confined geometry we developed the model of calculations of the electrical resistivity for metallic multilayers. It was shown that in the transport of charge in ferromagnetic material d-electrons play an important role. The key parameters in the presented model are: the width of the electron energy band and the shift of the energy level for two spin orientations as well as the Fermi energy and size of the sample (the thickness of magnetic and nonmagnetic layers and the total number of layers). The presented results of calculations for temperature dependence of magnetoresistance are in qualitative agreement with the available experimental data. The model calculations introduced in this paper can be applied to current-in-plane geometry as well as to current-perpendicular-to-plane geometry. The calculations are valid within the limitations of the resistor network model.

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“…insight in this aim (however out of the scope of this work); a different approach would be to consider both population in the equation of state of the system. 17 …”

Section: Simple Cubic Cell With Aligned Easy Axesmentioning

confidence: 99%

A Two-Population Analysis of the Magnetic Dipolar Interaction in Superparamagnetic Systems: A Monte Carlo Study

Serantes¹,

Pereiro²,

Baldomir³

2012

j nanosci nanotechnol

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To understand the influence of the magnetic dipolar interaction on the blocking temperature (T(B)) of superparamagnetic systems, usual models treat the dipolar energy as an additional term to the single-particle anisotropy energy barrier. However, such approaches cannot describe non-monotonic T(B)(c) dependences as reported both experimental and theoretically. Therefore, alternative approaches should be explored. For such a purpose, in this work we investigate a simple approach based on splitting the total population of the system into two subgroups, depending on its relative orientation (parallel- or antiparallel-aligned) with respect to the applied magnetic field direction. The suitability of such approach was explored by means of a Monte Carlo technique that provided us with a good insight into the properties of the system. Our results indicate that this two-population analysis can be a promising way to understand the SPM behaviour of interacting nanomagnetic systems.

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The size effect in the equation of state for nanostructures

Cited by 6 publications

References 35 publications

Pseudocritical behavior of ferromagnetic pure and random diluted nanoparticles with competing interactions: Variational and Monte Carlo approaches

Pseudocritical behavior of ferromagnetic pure and random diluted nanoparticles with competing interactions: Variational and Monte Carlo approaches

The Magnetic Equation of State and Transport Properties in Reduced Dimensions

A Two-Population Analysis of the Magnetic Dipolar Interaction in Superparamagnetic Systems: A Monte Carlo Study

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