Publisher's Note: Universal and scaled relaxation of interacting magnetic nanoparticles [Phys. Rev. B<b>70</b>, 172411 (2004)]

Chen, Xi; Sahoo, Sushrisangita; Kleemann, W.; Cardoso, S.; Freitas, P. P.

doi:10.1103/physrevb.70.219902

Cited by 20 publications

(37 citation statements)

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“…We find excellent agreement with extracted values for n from experimental relaxation curves in our DMIM samples [32]. (3) Relaxation curves, m(t), of a SFM sometimes show a peculiar behavior after rapidly FC the sample.…”

Section: Superferromagnetic (Sfm) Orderingsupporting

confidence: 71%

“…While SSG samples exhibit n < 1, SFM systems appear to have values n > 1 [32]. In the latter case m(t) obeys a power law,…”

Section: Superferromagnetic (Sfm) Orderingmentioning

confidence: 99%

“…One finds SSG behavior for a nominal thickness t n < 1.1 nm, while a SFM state is encountered at t n > 1.1 nm. Moreover, a crossover to a random field domain state (RFDS) is found at lower temperatures [32] in the SFM state. The borders of this phase diagram have recently been specified to be 0.5 < t n < 0.7 nm for SPM-to-SSG [21] and 1.6 < t n < 1.8 nm for SFM-to-percolated FM [35].…”

Section: Superferromagnetic (Sfm) Orderingmentioning

confidence: 99%

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Collective states of interacting ferromagnetic nanoparticles

Petracic

Chen

Bedanta

et al. 2006

Journal of Magnetism and Magnetic Materials

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158

129

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Discontinuous magnetic multilayers [CoFe/Al 2 O 3 ] are studied by use of magnetometry, susceptometry and numeric simulations. Soft ferromagnetic Co 80 Fe 20 nanoparticles are embedded in a diamagnetic insulating a-Al 2 O 3 matrix and can be considered as homogeneously magnetized superspins exhibiting randomness of size (viz. moment), position and anisotropy. Lacking intra-particle core-surface ordering, generic freezing processes into collective states rather than individual particle blocking are encountered. With increasing particle density one observes first superspin glass and then superferromagnetic domain state behavior. The phase diagram resembles that of a dilute disordered ferromagnet. Criteria for the identification of the individual phases are given.

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Section: Superferromagnetic (Sfm) Orderingsupporting

confidence: 71%

“…While SSG samples exhibit n < 1, SFM systems appear to have values n > 1 [32]. In the latter case m(t) obeys a power law,…”

Section: Superferromagnetic (Sfm) Orderingmentioning

confidence: 99%

Section: Superferromagnetic (Sfm) Orderingmentioning

confidence: 99%

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Collective states of interacting ferromagnetic nanoparticles

Petracic

Chen

Bedanta

et al. 2006

Journal of Magnetism and Magnetic Materials

Self Cite

158

129

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“…These theoretical predictions have been recently confirmed by measurements of relaxation in granular magnetic films. 10,11 The evolution towards an equilibrium state in relaxation phenomena is expected to approach a certain stationary regime. Generally the word stationary indicates a process described by time-independent parameters.…”

Section: Introductionmentioning

confidence: 99%

Power-law decay in first-order relaxation processes

2005

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Starting from a simple definition of stationary regime in first-order relaxation processes, we obtain that experimental results are to be fitted to a power-law when approaching the stationary limit. On the basis of this result we propose a graphical representation that allows the discrimination between power-law and stretched exponential time decays. Examples of fittings of magnetic, dielectric and simulated relaxation data support the results. 76.20.+q, 76.90.+d, 75.40.Mg

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“…The magnetization data were collected at 10 and 79 K. At 10 K there is a continuous increase of the magnetization even after 2.5 h, during which about 25% of the FC magnetization (in µ 0 H = 10 mT) was reached. We have fitted the low-temperature M(t) dependence by the follow equation [17]:…”

Section: Relaxation Of DC Magnetizationmentioning

confidence: 99%

Direct evidence of the low-temperature cluster-glass magnetic state of Nd2/3Ca1/3MnO3 perovskite

Feher

Desnenko

Fertman

et al. 2012

Low Temperature Physics

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In the presented study we have revealed a giant exchange bias in a colossal magnetoresistance Nd 2/3 Ca 1/3 MnO 3 perovskite at low temperatures, evident of an intrinsic exchange coupling in this compound. The phenomena found confirms our previous assumption that the low-temperature magnetic structure of the compound is represented by small (nanosized) ferromagnetic clusters immersed within the charge-ordered antiferromagnetic matrix. Magnetic behavior of the Nd 2/3 Ca 1/3 MnO 3 perovskite is consistent with a cluster-glass magnetic state and does not agree with a classical spin-glass state observed in a variety of disordered magnetic systems. We think that the cluster-glass magnetic behavior of Nd 2/3 Ca 1/3 MnO 3 originates from the selforganized phase-separated state of the compound. The Cole-Cole analysis of the dynamic susceptibility at lowtemperatures has shown extremely broad distribution of relaxation times, indicating that spins are frozen at a "macroscopic" time scale. Slow relaxation of the zero-field-cooled magnetization has been experimentally revealed as well. This slow relaxation confirms the cluster-glass magnetic state of the compound. Two strongly different relaxation mechanisms were found: the first one is characteristic for temperatures below the freezing temperature T g ∼ 60 K, the second one is characteristic for higher temperatures. PACS

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Publisher's Note: Universal and scaled relaxation of interacting magnetic nanoparticles [Phys. Rev. B70, 172411 (2004)]

Cited by 20 publications

References 0 publications

Collective states of interacting ferromagnetic nanoparticles

Collective states of interacting ferromagnetic nanoparticles

Power-law decay in first-order relaxation processes

Direct evidence of the low-temperature cluster-glass magnetic state of Nd2/3Ca1/3MnO3 perovskite

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