Microwave absorption properties of the core/shell-type iron and nickel nanoparticles

Lü, Bo; Dong, Xiyang; Huang, Hui; Zhang, Xue Feng; Zhu, X.G.; Lei, Junpeng; Sun, Jian

doi:10.1016/j.jmmm.2007.10.030

Cited by 304 publications

(146 citation statements)

References 31 publications

(51 reference statements)

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“…Moreover, although bi-magnetic core/shell structures composed of soft/soft materials have been shown to also have appealing applications (e.g., in biosensors, hyperthermia, microwave absorption and magnetic resonance imaging) [89,[315][316][317]], they will not be discussed in this review. Similarly, nanoparticles with surface anisotropy effects [318][319][320] will not be considered in this review, even if they could be viewed as a purely "magnetic" (i.e., not structural) soft/hard core/shell configurations.…”

Section: Static Magnetic Propertiesmentioning

confidence: 99%

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

et al. 2015

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A B S T R A C TThe applications of exchange coupled bi-magnetic hard/soft and soft/hard ferromagnetic core/shell nanoparticles are reviewed. After a brief description of the main synthesis approaches and the core/shell structural-morphological characterization, the basic static and dynamic magnetic properties are presented. Five different types of prospective applications, based on diverse patents and research articles, are described: permanent magnets, recording media, microwave absorption, biomedical applications and other applications. Both the advantages of the core/shell morphology and some of the remaining challenges are discussed.

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Section: Static Magnetic Propertiesmentioning

confidence: 99%

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

et al. 2015

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“…Overall, the complex permittivities of the prepared samples are lower than those of the ferromagnetic metal nanoparticles. In our former reports, the ε value of the paraffin matrix composites containing Fe nanoparticles is about 16 and that of Ni nanoparticle was measured around 14 over 2-18 GHz [23]. Metal alloy nanoparticles always show lower real permittivity than corresponding mono metals.…”

Section: Resultsmentioning

confidence: 81%

“…Generally the relative permeability can be expressed as µ = 1 + (M/H), where M is the magnetization and H is the external magnetic field. According to this basic equation, it is can be seen that the lower permeability values of (Ni, Al)/AlN nanoparticles than that of pure Ni nanoparticles [23] result from the decreasing saturation magnetization of (Ni, Al)/AlN nanoparticles with nonmagnetic ingredients. Several peaks, such as that at 3.2, 6.0 and 11.2 GHz, are observed in the curve of µ .…”

Section: Resultsmentioning

confidence: 99%

Enhanced Polarization in Tadpole-Shaped (Ni, Al)/Aln Nanoparticles and Microwave Absorption at High Frequencies

Huang¹,

Xue²,

Lü³

et al. 2011

PIER B

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Abstract-Tadpole-shaped (Ni, Al)/AlN nanoparticles were synthesized via evaporating Ni-Al alloy in a mixed atmosphere of N 2 and H 2 . As a counterpart, the spherical-shaped (Ni, Al)/Al 2 O 3 nanoparticles were also prepared from the same target alloy while in a mixture of Ar and H 2 . The electromagnetic parameters of as-made nanoparticles/paraffin composites were then investigated in the frequency range of 2-18 GHz. Excellent microwave absorption can be obtained for the tadpole-shaped (Ni, Al)/AlN-paraffin composite at high frequencies and in a thin layer, which is thought to be the result of the enhanced polarization in the anisotropic tadpole-shaped nanoparticles. With the increasing of the composite thickness, the frequency of effective reflection loss shifts towards lower frequencies due to an improved impedance match and absorption.

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“…1 The exchange resonance happens in the high-frequency microwave range in excess of 10 GHz in accordance with Ahsroni's theory. 9 Thus, the magnetic resonance observed at ∼4 GHz is mainly due to natural resonance. Figures 3(c) and 3(d) show the calculated f dependence of dielectric loss tangent (tan δ e = ε r /ε r ) and magnetic loss tangent (tan δ m = µ r /µ r ) of PC NC100 , PC NC200 , and PC NC300 based on the data in Figs.…”

Section: -5mentioning

confidence: 98%

“…1 The domain-wall resonance occurs only in multi-domain materials in the 1-100 MHz range. 9 The eddy-current loss is usually excluded because of the size effect. 1 The exchange resonance happens in the high-frequency microwave range in excess of 10 GHz in accordance with Ahsroni's theory.…”

Section: -5mentioning

confidence: 99%

Ag3PO4 nanoparticle-decorated Ni/C nanocapsules with tunable electromagnetic absorption properties

et al. 2017

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Core/shell-structured nickel/carbon (Ni/C) nanocapsules with Ag3PO4 nanoparticle decoration (Ag3PO4@Ni/C) are prepared by an arc-discharge process and an ion-exchange process. The Ag3PO4@Ni/C nanocapsules show a clear decoration of Ag3PO4 nanoparticles of 4–20 nm diameter on the C shell of the Ni/C nanocapsules of ∼60 nm diameter. The amount of Ag3PO4 nanoparticles that can be decorated on the Ni/C nanocapsules depends on the volume of Na2HPO4 reactant used in the ion-exchange process. The Ag3PO4@Ni/C nanocapsules demonstrate interestingly high and tunable electromagnetic absorption properties with different amounts of Ag3PO4 nanoparticle decoration in the paraffin-bonded composites over the 2–18 GHz microwave range. The nanocapsules prepared with 100 ml Na2HPO4 exhibit much enhanced dielectric and magnetic losses for an improved electromagnetic impedance match. These result in a large reflection loss (RL) of -31.4 dB at 12.3 GHz for a small absorber thickness of 2.6 mm in conjunction with a very wide effective absorption bandwidth (for RL<-10 dB) of 14 GHz (4–18 GHz) at a wide absorber thickness range of 1.4–5.0 mm.

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Microwave absorption properties of the core/shell-type iron and nickel nanoparticles

Cited by 304 publications

References 31 publications

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles

Enhanced Polarization in Tadpole-Shaped (Ni, Al)/Aln Nanoparticles and Microwave Absorption at High Frequencies

Ag3PO4 nanoparticle-decorated Ni/C nanocapsules with tunable electromagnetic absorption properties

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