Surface and Interparticle Effects in Amorphous Magnetic Nanoparticles

Zysler, Roberto D.; Biasi, E. De; Ramos, C.A.; Fiorani, D.; Romero, H.

doi:10.1007/0-387-26018-8_8

Cited by 19 publications

(20 citation statements)

References 32 publications

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“…All the M FC curves show continuous increase of the magnetization with decrease in temperature (Fig. 5), similar to the behaviour observed in non-interacting system [42,43,46]. Needless to say that M FC assumes a constant value at very low temperatures in system containing interacting magnetic particles [44].…”

Section: Article In Presssupporting

confidence: 52%

“…This noteworthy feature in M ZFC vs T plots has also been found in amorphous nanoparticles of Fe-Ni-B and Co-Ni-B alloy system of average size of 3 nm [42]. Moreover, Monte-Carlo simulations undertaken by assuming core-shell model further confirm the strong influence of the disordered shell spin in determining the magnetic behaviour of non-interacting particles [43].…”

Section: Article In Pressmentioning

confidence: 75%

“…7c. However, at 5 K, the M-H plots contain stretched S-or eye-like shapes matching well with the typical behaviour of feebly interacting nanoparticles [43]. Clearly, the hysteresis loops are broaden with increase enclosed area.…”

Section: Article In Pressmentioning

confidence: 80%

See 2 more Smart Citations

Sol–gel synthesis and anomalous magnetic behaviour of NiO nanoparticles

Thota

Kumar

2007

Journal of Physics and Chemistry of Solids

164

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Section: Article In Presssupporting

confidence: 52%

Section: Article In Pressmentioning

confidence: 75%

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Sol–gel synthesis and anomalous magnetic behaviour of NiO nanoparticles

Thota

Kumar

2007

Journal of Physics and Chemistry of Solids

164

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“…Thus, the magnetic interactions in the Co-W NPs increase as the amount of Co increases because particles are bigger and closer. These results of the magnetic interactions in the Co-W NPs are well supported by analysis of the variation of the FC-ZFC curves' height ratios, 56 which show the same trend. That is, FC-ZFC curves' height ratios for the a series are almost equal and they decrease as t Co increases for the b series samples.…”

Section: A Superparamagnetic Co-w Particlessupporting

confidence: 68%

Structural and Magnetic Properties of Amorphous Co–W Alloyed Nanoparticles

Figueroa

2014

Springer Theses

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W-capped Co nanoparticles dispersed in an alumina matrix are studied by means of high-resolution transmission electron microscopy, extended x-ray absorption fine structure, SQUID-based magnetic measurements, dc magnetization, ac magnetic susceptibility, and x-ray magnetic circular dichroism. Results show the formation of amorphous Co-W alloy nanoparticles, the magnetic properties of which are modified by the amount of W or Co present in the samples. The average Co magnetic moment depends on the number of W atoms surrounding it. Co-W particles show superparamagnetic behavior and are described as an array of noninteracting particles with random anisotropy axes and an average moment per particle proportional to the particle volume and to the average Co moment for each alloy composition. Values of the magnetic anisotropy constant of the particles are on the order of 10 6 erg/cm 3 , higher than that of bulk Co. Evidence of short-range ordering within each amorphous particle is found that provides insight of the origin of their magnetic anisotropy.

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“…In the case of Fe-Ni alloy composites however the amount of Fe-and Ni-oxides is much lower compared to the Fe-composites. This is due to the nature of precursor solution that forms with increasing Al 2 O 3 content [23]. The precursor gel is highly basic due to the presence of NH 4 OH which leads to the formation of Fe(OH) 3 and this increases with increasing Al 2 O 3 content.…”

Section: Structural Characterizationmentioning

confidence: 97%