Interactions effects in granular powder systems

El‐Hilo, M.; Bsoul, Ibrahim; Rousan, Akram; Hudeish, A.Y.

doi:10.1016/j.jmmm.2003.12.752

Cited by 5 publications

(1 citation statement)

References 5 publications

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“…On the contrary, it limits the storage density of magnetic recording media. Our literature search has shown that studies on the interaction effects in BaFe systems are rather scarce [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Factors influencing the remanent properties of hard magnetic barium ferrites: Impurity phases and grain sizes

Topal

2008

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 99%

Factors influencing the remanent properties of hard magnetic barium ferrites: Impurity phases and grain sizes

Topal

2008

Journal of Magnetism and Magnetic Materials

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Size‐Dependent Nonlinear Weak‐Field Magnetic Behavior of Maghemite Nanoparticles

Montferrand

Lalatonne

Bonnin

et al. 2012

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The magnetic behavior at room temperature of maghemite nanoparticles of variable sizes (from 7 to 20 nm) is compared using a conventional super quantum interference device (SQUID) and a recently patented technology, called MIAplex. The SQUID usually measures the magnetic response versus an applied magnetic field in a quasi‐static mode until high field values (from –4000 to 4000 kA m−1) to determine the field‐dependence and saturation magnetization of the sample. The MIAplex is a handheld portable device that measures a signal corresponding to the second derivative of the magnetization around zero field (between –15 and 15 kA m−1). In this paper, the magnetic response of the size series is correlated, both in diluted and powder form, between the SQUID and MIAplex. The SQUID curves are measured at room temperature in two magnetic field ranges from –4000 to 4000 kA m−1 (–5T to 5T) and from –15 to 15 kA m−1. Nonlinear behavior at weak fields is highlighted and the magnetic curves for diluted solutions evolve from quasi‐paramagnetic to superparamagnetic behavior when the size of the nanoparticles increases. For the 7‐nm sample, the fit of the magnetization with the Langevin model weighted with log‐normal distribution corresponds closely to the magnetic size. This confirms the accuracy of the model of non‐interacting superparamagnetic particles with a magnetically frustrated surface layer of about 0.5 nm thickness. For the other samples (10‐nm to 21‐nm), the experimental weak‐field magnetization curves are modeled by more than one population of magnetically responding species. This behavior is consistent with a chemically uniform but magnetically distinct structure composed of a core and a magnetically active nanoparticle canted shell. Accordingly the weak‐field signature corresponds to the total assembly of the nanoparticles. The impact of size polydispersity is also discussed.

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Remanence properties and Mössbauer analysis of the strontium hexaferrite with copper deposited by sputtering

Santos-López,

Martínez,

Lobo-Guerrero

et al. 2024

J Mater Sci

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Interactions effects in granular powder systems

Cited by 5 publications

References 5 publications

Factors influencing the remanent properties of hard magnetic barium ferrites: Impurity phases and grain sizes

Factors influencing the remanent properties of hard magnetic barium ferrites: Impurity phases and grain sizes

Size‐Dependent Nonlinear Weak‐Field Magnetic Behavior of Maghemite Nanoparticles

Remanence properties and Mössbauer analysis of the strontium hexaferrite with copper deposited by sputtering

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