Microwave absorption properties of FeNi3 submicrometre spheres and SiO2@FeNi3 core–shell structures

Yan, Shaohua; Zhen, Liang; Xu, Cheng‐Yan; Jiang, Jian-Tang; Shao, Wen‐Zhu

doi:10.1088/0022-3727/43/24/245003

Cited by 123 publications

(75 citation statements)

References 35 publications

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“…1 from which it is clear that the NiFe film consists of a polycrystalline granular (10-30 nm) ferromagnetic (FM) phase with an average film composition of 45%Ni-55%Fe, along with a thin (1 to 2 nm) secondary Fe deficient phase at the grain boundaries [blue boundary region in Fig. 1(d 3 Fe nanograins is in the range of ∼20−80 Oe (previously reported) higher than the coercivity (measured H C = 0.5Oe) of the bulk Ni 45 Fe 55 alloy film [22][23][24][25]. Detailed magnetic measurements have been carried out in a superconducting quantum interference device (SQUID) magnetometer (MPMS XL5, Quantum Design) across a wide temperature range of 5-300 K under a maximum field H max of ±50 kOe .…”

mentioning

confidence: 94%

Observation of complete inversion of the hysteresis loop in a bimodal magnetic thin film

Maity¹,

Kepaptsoglou

Schmidt³

et al. 2017

Phys. Rev. B

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The existence of inverted hysteresis loops (IHLs) in magnetic materials is still in debate due to the lack of direct evidence and convincing theoretical explanations. Here we report the direct observation and physical interpretation of complete IHL in Ni45Fe55 films with 1 to 2 nm thin Ni3Fe secondary phases at the grain boundaries. The origin of the inverted loop, however, is shown to be due to the exchange bias coupling between Ni45Fe55 and Ni3Fe, which can be broken by the application of a high magnetic field. A large positive exchange bias (HEB=14×HC) is observed in the NiFe composite material giving novel insight into the formation of a noninverted hysteresis loop (non-IHL) and IHL, which depend on the loop tracing field range (HR). The crossover from non-IHL to IHL is found to be at 688 Oe

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mentioning

confidence: 94%

Observation of complete inversion of the hysteresis loop in a bimodal magnetic thin film

Maity¹,

Kepaptsoglou

Schmidt³

et al. 2017

Phys. Rev. B

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“…For example, CoFe alloy nanoparticles were reported to have the ε values around 6.5 in the frequency range of 2-14 GHz [24]. The permittivity of FeNi 3 alloy particles is almost constant of 5.9 in the 2-10 GHz range [25] that is nearly half lower than that of Fe and Ni nanoparticles. It is speculated that the lower ε values of these alloys result from the increasing resistivity, because metal alloys normally have greater resistivity than pure metals.…”

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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“…Among various potential candidates for EM wave absorbers, the one in the form of magnetic nanoparticles core/ dielectric shell-structured nanocapsules, such as Ni/ZnO, FeNi 3 /SiO 2 , Ni/PANI, Ni/C, and Ni/Ni 2 O 3 nanocapsules, has been of particular interest in recent years owing to its tailorable properties in conjunction with smaller sizes and weights [6][7][8][9][10] . An essence of determining the EM wave absorbing properties of the nanocapsules is to obtain a balance between the permeability of the magnetic nanoparticle cores with the permittivity of the dielectric shells 11 .…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Three-dimensional Butterfly-like Ni Architectures as Microwave Absorbers

Sun

Cui

et al. 2015

Mat. Res.

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Three-dimensional butterfly-like Ni architectures were fabricated by a surfactant-assisted hydrothermal method. The Ni architectures, with lengths of about 20 μm and widths of 4-6 μm, were assembled from tens of Ni nanorods with the averaged diameter of about 200 nm. The Ni nanorods were coated by oxide shells. The saturation magnetization of the Ni architectures was found to be 66.2 emu/g. The magnetic loss in the Ni architectures was mainly caused by the natural resonance, while the dielectric relaxation loss was originated from the interfacial relaxation between the oxide shells and the Ni nanorods in addition to the size distribution and morphology of the Ni architectures. Absorbers with a thickness of 2.1 mm exhibited an optimal reflection loss (RL) value of -38.9 dB at 12.8 GHz. RL values exceeding -20 dB in the 8.0-17.8 GHz range were obtained by choosing absorber thicknesses between 1.5 and 3.2 mm. A quarter-wavelength cancellation model was used to explain the observed thickness dependence of RL peak frequency.

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Microwave absorption properties of FeNi₃ submicrometre spheres and SiO₂@FeNi₃ core–shell structures

Cited by 123 publications

References 35 publications

Observation of complete inversion of the hysteresis loop in a bimodal magnetic thin film

Observation of complete inversion of the hysteresis loop in a bimodal magnetic thin film

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

Hydrothermal Synthesis of Three-dimensional Butterfly-like Ni Architectures as Microwave Absorbers

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