Investigation of Magnetic Properties in Iron-Based Nanocrystalline Alloys by Mössbauer Effect and Magnetization Measurements

Hesse, J.; Hupe, O.; Hofmeister, Clara; Bremers, Heiko; Чуев, М. А.; Afanas’ev, A. M.

doi:10.1007/978-94-010-0151-9_13

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…In the case of both Nb and Mo systems, the presence of superparamagnetic fluctuations is undoubtedly evidenced by the broadening of the outer sextet and by a rapid emergence of a quadrupolar doublet, as shown in figures 1(a) and 2(a), respectively. Similar results were reports also in [11,12]. When the volumetric crystalline fraction increases, the system progressively behaves as an interacting assembly of singledomain magnetic grains, i.e.…”

Section: Discussionsupporting

confidence: 88%

“…At higher nanograin concentrations the particle-particle interaction leads to a collective magnetic behaviour, i.e. by an external field induced super-ferromagnetism [11]. The temperature dependences of hyperfine field, particularly that of nanocrystalline grains, are discussed on the basis of structural features.…”

Section: Introductionmentioning

confidence: 98%

“…Only the results published for Fe-Zr-Cu-B alloys with different metalloid concentration [8,9] and for Fe 92 Zr 8 [10] referring to one particular heat treatment are available. More recently, Fe 86−x Cu 1 Nb x B 13 (x = 4, 5, 7) nanocrystalline alloys obtained under different annealing conditions were investigated with the help of Mössbauer spectrometry and magnetization measurements [11]. Using a novel approach to the fitting of Mössbauer spectra [12,13] evidence for superparamagnetic behaviour at low nanograin concentrations was given.…”

Section: Introductionmentioning

confidence: 99%

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Temperature behaviour of iron nanograins in Nanoperm-type alloys

Miglierini

Grenèche

2003

J. Phys.: Condens. Matter

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The evolution of hyperfine interactions with temperature is studied for Fe 80 M 7 Cu 1 B 12 (M = Mo, Nb and Ti) nanocrystalline alloys with the help of 57 Fe Mössbauer spectrometry. The nanocrystalline structure features an amorphous residual matrix surrounding the crystalline nanograins of bcc-Fe. In addition, interfacial regions comprising atoms located on the surface of nanocrystals are considered. Special attention is paid to the temperature behaviour of hyperfine magnetic fields of the nanograins. The temperature dependence of hyperfine magnetic fields pointed out significant differences between bulk and nanosized bcc-Fe, suggesting a decrease in the corresponding magnetic ordering temperature. The higher the crystalline content is, the lower the difference between the hyperfine fields of bulk bcc-Fe and nanocrystalline Fe grains. This tendency is observed for M = Nb and Ti whereas it is completely opposite for M = Mo. The present results are explained in terms of mechanical stresses induced during the transformation from the amorphous to the nanocrystalline state, thus excluding a significant number of impurities diffused into the nanocrystalline grains.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Temperature behaviour of iron nanograins in Nanoperm-type alloys

Miglierini

Grenèche

2003

J. Phys.: Condens. Matter

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“…These nanograins are of nearly the same size exhibiting a rather narrow size distribution and are well separated from each other. This fact has been checked using transmission electron microscopy [8,9]. Additionally we used the fact that the nanograins consist of pure bcc iron.…”

Section: The Alloy Samples and Magnetization Measurementsmentioning

confidence: 99%

The huge influence of nanograins on the magnetic properties of iron-based Fe–Cu–Nb–B nanocrystalline alloys

Bremers¹,

Hupe²,

Hofmeister³

et al. 2005

J. Phys.: Condens. Matter

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In 1995 Skorvanek and O'Handley presented the first experimental evidence for a huge influence of nanograins on the magnetization of a nanostructured alloy. In this contribution experiments are described, performed on ascast amorphous and nanostructured Fe 79 Cu 1 Nb 7 B 13 alloys. In order to get nanostructured samples with different nanograin contents the samples were annealed at different properly chosen temperatures in vacuum. This led to the formation of nanograins embedded in a residual amorphous matrix. These nanograins consist of pure bcc Fe of about 5-6 nm in diameter. Their content can be enhanced without markedly changing their size when annealing at slightly higher temperatures. So an alloy series with the same nominal composition but different nanograin contents and residual amorphous matrices, i.e. a series of nanostructured alloys, was obtained. Our aim was to study the influence of increasing nanograin concentration on the magnetic properties of the coupled system amorphous matrix plus nanograins. We describe magnetization measurements over a wide temperature range, below and above the Curie temperature of the initial amorphous matrix. In a next step these measurements are evaluated in a molecular field approach assuming two different coupled ferromagnetic systems assigned to the amorphous matrix and the nanograins.

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Investigation of Magnetic Properties in Iron-Based Nanocrystalline Alloys by Mössbauer Effect and Magnetization Measurements

Cited by 2 publications

References 11 publications

Temperature behaviour of iron nanograins in Nanoperm-type alloys

Temperature behaviour of iron nanograins in Nanoperm-type alloys

The huge influence of nanograins on the magnetic properties of iron-based Fe–Cu–Nb–B nanocrystalline alloys

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