Superparamagnetism versus superspin glass behavior in dilute magnetic nanoparticle systems

Chen, Xi; Bedanta, Subhankar; Petracic, O.; Kleemann, W.; Sahoo, Sarbeswar; Cardoso, S.

doi:10.1103/physrevb.72.214436

Cited by 144 publications

(92 citation statements)

References 26 publications

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“…This type of behaviour has been reported previously where a Langevin function with a linear term has been fit to particles dispersed in a diamagnetic matrix, where the system should behave superparamagentically but the particle sizes calculated from the magnetic moments of the particles are unrealistic for a Langevin function fit (i.e. sub-nanometer [12]). This is also a similar result to our study of producing Ni nanoparticles from the decomposition of Ni(COD) 2 by varying the temperature where a two-term Langevin function is fit to the scaled data but produced particle sizes suggesting sub-nanomater clusters had formed [33].…”

Section: Samples 1 2 Andsupporting

confidence: 64%

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Controlling nickel nanoparticle size in an organic/metal–organic matrix through the use of different solvents

2013

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(2013) 'Controlling nickel nanoparticle size in an organic/metal-organic matrix through the use of di erent solvents. ', Nanoscale., 5 (24). pp. 12212-12223. Further information on publisher's website:http://dx.doi.org/10.1039/c3nr04883gPublisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. (0) atoms from the Ni(COD)2. Materials are characterised with a combination of X-ray diffraction, electron microscopy and magnetometry and it is found that samples made using a halocarbon solvent resulted in clustered bulk Ni particles (size ≤ 10 nm) with anomalously high superparamagnetic blocking temperatures. Using an isocyanide solvent produces smaller (size ∼ 1 nm), well dispersed particles that show little evidence of superparamagnetic blocking in the range of temperatures investigated (> 2 K). In all samples there is another component which dominates the magnetic response at low temperatures and shows an interesting temperature dependent scaling behaviour when plotted as M vs B/T which we believe is related to the organo-metallic matrix that the particles are trapped within. We propose that the enhanced blocking temperature of particles synthesised using halocarbon solvents can be attributed to inter-particle dipolar interactions and nanoparticle-matrix exchange interactions.

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Section: Samples 1 2 Andsupporting

confidence: 64%

“…Nanoparticles that are dispersed within a matrix can show some very interesting magnetic properties that are related to interactions between the moments on each particle. Competing interactions and changes in particle size can cause a system to show superparamagnetic, super spin glass or super ferromagnetic properties [11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Controlling nickel nanoparticle size in an organic/metal–organic matrix through the use of different solvents

2013

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“…Such a decomposition into two uncoupled subsystems, SPM and SSG, was proposed by Chen et al [54] for the samples with high size dispersivity. Probably, this is the result of the interplay between the inhomogeneous distribution, which would lead to formation of SSG on percolating clusters, and the presence of the glassy matrix which diminishes the dipolar interactions that might induce the SSG state for the tiniest nanoparticles [55].…”

Section:  mentioning

confidence: 99%

“…What is puzzling is the prevalence of single particle behavior at low temperatures and of collective behavior at high temperatures. To explain that, we have to invoke the model of two independent subsystems [54]. One subsystem is made of weakly interacting clusters that progressively freeze starting at relatively high temperatures (with the relaxation time obeying Vogel-Fulcher/scaling law dependence) with only a fraction of the superspins participating to the SSG [53].…”

Section:  mentioning

confidence: 99%

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

et al. 2017

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Abstract:The specific dynamic magnetic response and magnetic relaxation phenomena in magnetite-based glass-ceramics by controlled crystallization of Fe-rich borosilicate glasses with 25 wt% Fe 2 O 3 , in the presence of two types of nucleating agents, Cr 2 O 3 and P 2 O 5 , were investigated. The magnetic response is complex and shows contributions arising from two subsystems: a system with collective characteristics, superspin-glass like, and another one with single particle characteristics (superparamagnetic) with dipolar interaction. The nucleating agents have strong influence on the characteristic temperatures and anisotropy energy.

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“…The presence of SSG moment is revealed by a significant memory effect in a stop-and-wait protocol of measurement. 5,6 The memory effect turns out to be depending on the temperature.…”

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confidence: 99%

Spontaneous exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9

Maity¹,

Goswami²,

Bhattacharya³

et al. 2013

Journal of Applied Physics

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Superparamagnetism versus superspin glass behavior in dilute magnetic nanoparticle systems

Cited by 144 publications

References 26 publications

Controlling nickel nanoparticle size in an organic/metal–organic matrix through the use of different solvents

Controlling nickel nanoparticle size in an organic/metal–organic matrix through the use of different solvents

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

Spontaneous exchange bias in a nanocomposite of BiFeO3-Bi2Fe4O9

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