Luis<i>et al.</i>Reply:

Luìs, Fernando; Pétroff, F.; Torrès, J.; Garcı́a, L. M.; Bartolomé, J.; Carrey, Julian; Vaurés, A.

doi:10.1103/physrevlett.90.059706

Cited by 53 publications

(100 citation statements)

References 4 publications

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“…This model predicted that the flipping of magnetic moment slows down with increasing dipole-dipole interaction. The superparamagnetic model with modified energy barrier was quite successful in interpreting experimental observations for different interacting particle systems [17][18][19] and has been recently confirmed by Monte Carlo simulations. 20 Interestingly, Mørup and Tronc 21 proposed a different form of effective energy barrier for the superparamagnetic model and successfully explained their experimental results obtained on weakly interacting ␥-Fe 2 O 3 particles.…”

Section: Introductionmentioning

confidence: 89%

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Memory effect and spin-glass-like behavior in Co-Ag granular films

Zhang

Zheng

et al. 2007

Phys. Rev. B

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The memory effect was clearly observed in dc-sputtered metallic, magnetic Co-Ag granular films, which indicates the existence of a spin-glass-like phase at low temperatures. However, the memory effect diminished dramatically after the films were annealed at 300°C for 1 h. It was also found that the memory effect weakened gradually with increasing volume fraction of magnetic clusters. The experimental results indicate that the dipolar interaction is not the major origin for the formation of low-temperature spin-glass-like ͑SGL͒ phase in metallic, magnetic granular materials. On the other hand, a Ruderman-Kittel-Kasuya-Yosida-like exchange interaction between the nanoparticles may be responsible for the collective SGL dynamics and the resulting memory effect.

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Section: Introductionmentioning

confidence: 89%

“…17,[37][38][39][40] Both models are quite successful in describing the memory effect in spin-glass systems. 27 We will not reiterate them here.…”

Section: Figmentioning

confidence: 99%

Memory effect and spin-glass-like behavior in Co-Ag granular films

Zhang

Zheng

et al. 2007

Phys. Rev. B

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“…Thus, the effective conductivity is given as Decomposition 29 and the sample conductivity is obtained from Eq. (6). The result depends obviously of the magnetic configuration, which is used as input to obtain the inter-particle conductivities (Eq.…”

Section: The Model and The Simulation Methodsmentioning

confidence: 99%

Correlation between tunneling magnetoresistance and magnetization in dipolar-coupled nanoparticle arrays

Kechrakos

Trohidou

2005

Phys. Rev. B

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The tunneling magnetoresistance (TMR) of a hexagonal array of dipolar coupled anisotropic magnetic nanoparticles is studied using a resistor network model and a realistic micromagnetic configuration obtained by Monte Carlo simulations. Analysis of the field-dependent TMR and the corresponding magnetization curve shows that dipolar interactions suppress the maximum TMR effect, increase or decrease the field-sensitivity depending on the direction of applied field and introduce strong dependence of the TMR on the direction of the applied magnetic field. For off-plane magnetic fields, maximum values in the TMR signal are associated with the critical field for irreversible rotation of the magnetization. This behavior is more pronounced in strongly interacting systems (magnetically soft), while for weakly interacting systems (magnetically hard) the maximum of TMR ( ) occurs below the coercive field ( ), in contrast to the situation for non-interacting nanoparticles () or in-plane fields. The relation of our simulations to recent TMR measurements in self-assembled Co nanoparticle arrays is discussed.

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“…frozen ferrofluids [2], discontinuous metal-insulator multilayers (DMIMs) [8,13], co-sputtered metal-insulator films [14], selforganized particle arrays on surfaces [15], focused ionbeam structured thin films [16] and mechanically alloyed materials [17].…”

Section: Introductionmentioning

confidence: 99%

Collective states of interacting ferromagnetic nanoparticles

Petracic

Chen

Bedanta

et al. 2006

Journal of Magnetism and Magnetic Materials

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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Luiset al.Reply:

Cited by 53 publications

References 4 publications

Memory effect and spin-glass-like behavior in Co-Ag granular films

Memory effect and spin-glass-like behavior in Co-Ag granular films

Correlation between tunneling magnetoresistance and magnetization in dipolar-coupled nanoparticle arrays

Collective states of interacting ferromagnetic nanoparticles

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