The magnetic properties of disordered Fe–Al alloy system

Oubelkacem, A.; Essaoudi, I.; Ainane, A.; Dujardin, F.; Sousa, J. Ricardo de; Saber, M.

doi:10.1016/j.physa.2010.04.033

“…В последние годы к сплавам Fe-Al интерес вновь усилился, поскольку они проявляют важные для практического применения высокие технологические свойства [2]. Кроме того, в них можно изучать критическое поведение системы при фазовых переходах [3,4], например, между ферромагнитной, парамагнитной и спин-стеклоподобной фазами [5,6].…”

Section: Introductionunclassified

Ближний порядок в "неупорядоченных" твердых растворах алюминия в α-железе

Ершов¹,

Клейнерман²,

Лукшина³

et al. 2023

Физика Твердого Тела

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The atomic structure of soft magnetic iron-aluminum alloys is studied by X-ray diffraction and nuclear gamma-resonance spectroscopy. The concentration dependence of the body-centered cubic lattice constant and the short-range order (SRO) parameters in the region of a disordered solid solution is monitored. It is shown that in the concentration range from 3 to 18 at.% Al, the lattice constant increases almost linearly. Discrete decomposition of nuclear gamma resonance spectra makes it possible to determine such SRO parameters as the relative fractions of contributions from coordinations without Al atoms and with one, two, and three Al atoms in the first and second coordination shells. The deviation of the values of these fractions from the average statistical probabilities indicates the presence of a chemical order in the arrangement of atoms. The largest deviations are observed at 12 and 15 at.% Al. Conditions of preliminary heat treatment, such as quenching from the paramagnetic state and holding in the ferromagnetic state, give very similar values of the SRO parameters. The method is characterized by a high resolution in the hyperfine field, while having a rather high sensitivity for determining the intensity of individual contributions.

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“…In recent years, interest in Fe-Al alloys has increased again, since they exhibit high technological properties that are important for practical applications [2]. In addition, they can be used to study the critical behavior of a system upon phase transitions [3,4], for example, between ferromagnetic, paramagnetic, and spin-glasslike phases [5,6].…”

Section: Introductionmentioning

confidence: 99%

Short-range order in "disordered" aluminum solid solutions in α-iron

Ershov

¹

,

Kleinerman

²

,

Lukshina

³

et al. 2023

Physics of the Solid State

2

0

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The atomic structure of soft magnetic iron-aluminum alloys is studied by X-ray diffraction and nuclear gamma-resonance spectroscopy. The concentration dependence of the body-centered cubic lattice constant and the short-range order (SRO) parameters in the region of a disordered solid solution is monitored. It is shown that in the concentration range from 3 to 18 at.% Al, the lattice constant increases almost linearly. Discrete decomposition of nuclear gamma resonance spectra makes it possible to determine such SRO parameters as the relative fractions of contributions from coordinations without Al atoms and with one, two, and three Al atoms in the first and second coordination shells. The deviation of the values of these fractions from the average statistical probabilities indicates the presence of a chemical order in the arrangement of atoms. The largest deviations are observed at 12 and 15 at.% Al. Conditions of preliminary heat treatment, such as quenching from the paramagnetic state and holding in the ferromagnetic state, give very similar values of the SRO parameters. The method is characterized by a high resolution in the hyperfine field, while having a rather high sensitivity for determining the intensity of individual contributions Keywords: soft magnetic alloys, disordered Fe-Al solid solution, local ordering, X-ray diffraction, Mossbauer effect, distribution of atoms over coordination shells.

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“…Recent studies have also shown that Fe-Al alloys are promising candidates for data storage, due to the presence of some magnetic patterns appearing at room temperature [2][3][4]. At the same time, the magnetic properties of Fe-Al alloys are strongly linked to their chemical structure, since depending on composition and synthesis method, they can behave either as a ferromagnet or a paramagnet at room temperature [5][6][7]. It is also possible to induce in these compounds new types of cooperative phenomena, such as superparamagnetism and reentrant spin glass like phases [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Cluster size effects in the magnetic properties of Fe$_p$-Al$_{q=1-p}$ alloys

Santos-Filho,

Santos,

Batista

et al. 2019

Preprint

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A spin-1/2 Ising model, defined in the body centered cubic lattice, is used to describe some of the thermodynamic properties of Fep-Alq alloys, with p + q = 1. The model assumes, besides the nearest-neighbor exchange coupling, the existence of further next-nearest-neighbor superexchange interactions, where the latter ones depend on the aluminum atoms cluster size. The Ising system so considered is studied by employing Monte Carlo simulations, using a hybrid algorithm consisting of one single-spin Metropolis move together with one single-cluster Wolff algorithm allied, in addition, with single histograms procedures and finite-size scaling techniques. Quite good fits to the experimental results of the ordering critical temperature, as a function of Al concentration in the range 0 ≤ q < 0.7, are obtained and compared to more recent theoretical approaches done on the same alloys.

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The magnetic properties of disordered Fe–Al alloy system

Cited by 15 publications

References 17 publications

Ближний порядок в "неупорядоченных" твердых растворах алюминия в α-железе

Ближний порядок в "неупорядоченных" твердых растворах алюминия в α-железе

Short-range order in "disordered" aluminum solid solutions in α-iron

Cluster size effects in the magnetic properties of Fe$_p$-Al$_{q=1-p}$ alloys

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The magnetic properties of disordered Fe–Al alloy system

Cited by 15 publications

References 17 publications

Ближний порядок в "неупорядоченных" твердых растворах алюминия в &alpha;-железе

Ближний порядок в "неупорядоченных" твердых растворах алюминия в &alpha;-железе

Short-range order in &quot;disordered&quot; aluminum solid solutions in α-iron

Cluster size effects in the magnetic properties of Fe$_p$-Al$_{q=1-p}$ alloys

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Product

Resources

About

Ближний порядок в "неупорядоченных" твердых растворах алюминия в α-железе

Ближний порядок в "неупорядоченных" твердых растворах алюминия в α-железе

Short-range order in "disordered" aluminum solid solutions in α-iron