Effect of interparticle interactions in (Fe0.26Ni0.74)50B50magnetic nanoparticles

Zysler, R.D.; Ramos, C.A.; Biasi, E. De; Romero, H.; Ortega, Ada; Fiorani, D.

doi:10.1016/s0304-8853(00)00368-1

Cited by 66 publications

(42 citation statements)

References 18 publications

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“…4. Evidently, magnetization does not saturate even at the maximum field value of 10 T. Such type of nonsaturation behaviour of magnetization under a high field is usually found in spin glass/cluster-spin glass systems with competing exchange interactions below the spin freezing temperature [2,28]. The maximum values of magnetization taken in the obtained magnetic field of 10 T are 19.2 emu/g for W250 and 15.8 emu/g for S250.…”

Section: ((mentioning

confidence: 75%

Magnetism of amorphous Fe ₂ O ₃ nanopowders synthesized by solid‐state reactions

Zbořil

Machala

Mashlan

et al. 2004

phys. stat. sol. (c)

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PACS 75.50. Kj, 75.75+a, 76.80.+y, 81.07.Wx Monodispersed amorphous Fe 2 O 3 nanoparticles with the size ranging from 1 to 4 nm have been prepared by thermally induced oxidative decomposition of Prussian Blue, Fe 4 [Fe(CN) 6 ] 3 , in air. Amorphous nanopowders exhibit specific magnetic behaviour strongly affected by interparticle interactions and extremely low particle size with a high contribution of the surface anisotropy as illustrated by temperature dependent and external field Mössbauer spectroscopy and magnetization measurements (4-300 K). Some of the properties are in close similarity to those of spin glasses including the fast thermal variation of superparamagnetic fraction in the Mössbauer spectra, or the particle size independence of the blocking temperature, and non-saturation of magnetization even at 5 K and magnetic field of 10 T. The reduced value of internal magnetic hyperfine field (∼49 T at 5 K) and no indications of the tetrahedral Fe 3+ sites in the 5T/5K external field Mössbauer spectra are the principal found differences in comparison with the magnetic behaviour of nanocrystalline γ-Fe 2 O 3 .

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Section: ((mentioning

confidence: 75%

Magnetism of amorphous Fe ₂ O ₃ nanopowders synthesized by solid‐state reactions

Zbořil

Machala

Mashlan

et al. 2004

phys. stat. sol. (c)

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“…[6][7][8][9][10][11][12][13] It is difficult to experimentally establish the precise type of glassy ordering or blocking because many of the magnetic signatures are similar. There are, however, some subtle differences.…”

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confidence: 99%

Spin glass or random anisotropy?: The origin of magnetically glassy behavior in nanostructured GdAl2

Shand

Stark

Williams

et al. 2005

Journal of Applied Physics

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Initially crystalline GdAl2 was mechanically milled for long times to produce a highly chemically disordered phase with approximately 8-nm grains. Analysis of dc magnetization measurements using an Arrott plot and the approach to saturation suggest the presence of significant random anisotropy. ac susceptibility measurements showed that the shift in the peak temperature with frequency usually seen in magnetically glassy and superparamagnetic systems was virtually undetectable in the 10–1000-Hz frequency range. Based on these results, we believe that this material represents an interacting system with random anisotropy, where the anisotropy is the result of surface and interface asymmetries.

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“…On the other hand, the M(T) curve under FC condition of the powder sample, where strong interparticle interactions are present, behaves very differently, i.e., the magnetization decreases at low temperatures (Figure 2(b)). This curve shape is typical of spin-glass and cluster-glass systems where interactions frustrate the magnetic order, giving the observed magnetization curve [25,26]. These interparticle interactions probably also frustrate the magnetic order of the particle surface spins, reinforcing the magnetization reduction effect.…”

Section: Resultsmentioning

confidence: 72%

Anomalous Magnetization Enhancement and Frustration in the Internal Magnetic Order on (Fe0.69Co0.31)B0.4 Nanoparticles

2012

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Abstract:We have studied the internal magnetic order of 3-nm (Fe 0.69 Co 0.31 ) 0.6 B 0.4 amorphous nanoparticles. These nanoparticles were dispersed in a non-magnetic matrix (non-interacting nanoparticles) to contrast them with the powder samples, where strong interparticle interactions are present. In similar fashion to the bulk alloy, this system exhibits a saturation magnetization maximum as a function of Fe composition near 69 at% Fe for the powder and dispersed samples at all temperatures. The saturation magnetization (M S ) of the dispersed sample shows anomalous behavior, revealing frustration in the internal magnetic order of the particles. Unexpectedly, the M S of the non-interacting sample at low temperatures is larger than the corresponding bulk alloy or the calculated value of M S for the same Fe-Co composition. By contrast, the powder sample has low M S values and it is approximately constant in temperature.

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Effect of interparticle interactions in (Fe0.26Ni0.74)50B50magnetic nanoparticles

Cited by 66 publications

References 18 publications

Magnetism of amorphous Fe ₂ O ₃ nanopowders synthesized by solid‐state reactions

Magnetism of amorphous Fe ₂ O ₃ nanopowders synthesized by solid‐state reactions

Spin glass or random anisotropy?: The origin of magnetically glassy behavior in nanostructured GdAl2

Anomalous Magnetization Enhancement and Frustration in the Internal Magnetic Order on (Fe0.69Co0.31)B0.4 Nanoparticles

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Effect of interparticle interactions in (Fe0.26Ni0.74)50B50magnetic nanoparticles

Cited by 66 publications

References 18 publications

Magnetism of amorphous Fe 2 O 3 nanopowders synthesized by solid‐state reactions

Magnetism of amorphous Fe 2 O 3 nanopowders synthesized by solid‐state reactions

Spin glass or random anisotropy?: The origin of magnetically glassy behavior in nanostructured GdAl2

Anomalous Magnetization Enhancement and Frustration in the Internal Magnetic Order on (Fe0.69Co0.31)B0.4 Nanoparticles

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Magnetism of amorphous Fe ₂ O ₃ nanopowders synthesized by solid‐state reactions

Magnetism of amorphous Fe ₂ O ₃ nanopowders synthesized by solid‐state reactions