Microwave complex permeability of planar anisotropy carbonyl-iron particles

Han, Rui; Qiao, Liang; Wang, Tao; Li, Fashen

doi:10.1016/j.jallcom.2010.11.074

Cited by 106 publications

(41 citation statements)

References 29 publications

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“…In recent years, carbonyl irons were widely investigated as one of typical magnetic microwave absorbing materials [2][3][4]. However, the low density and absorption properties of the commercial carbonyl iron restrict its use in the applications.…”

Section: Introductionmentioning

confidence: 99%

Flowerlike iron oxide nanostructures and their application in microwave absorption

Guo

Xia

Wang

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Flowerlike iron oxide nanostructures and their application in microwave absorption

Guo

Xia

Wang

et al. 2015

Journal of Alloys and Compounds

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“…Firstly, the aspect ratio increases with the increasing milling time; secondly, the high aspect ratio of Fe-Ni particles facilitates the formation of particle clusters or partial connectivity, leading to an improvement in electrical conductivity, which causes the higher e 0 and e 00 [5,31]. According to the LLG equation [32] where g is the gyromagnetic ratio, M s is the saturation magnetization, m s is the static permeability, f r is the resonance frequency, H ha and H ea are the effective anisotropy fields when the magnetization deviates from the easy axis in the hard plane and easy plane, respectively. The thickness of each sample with different milling time is below 3 mm as shown in Fig.…”

Section: Em Parametersmentioning

confidence: 99%

Particle thickness effect on electromagnetic properties of flake‐shaped FeNi alloy

Zhou

Ying

et al. 2015

Physica Status Solidi (a)

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In this paper, flake-shaped Fe 50 Ni 50 alloy particles were prepared by mechanical ball milling and subsequent calcination method. The thickness of these particles was studied though different milling time and the electromagnetic (EM) properties were investigated in the frequency range of 30 MHz-1 GHz. The X-ray diffraction (XRD) patterns were used to investigate the phase formation process with the calcination temperature and demonstrate that the Fe 50 Ni 50 solid solution formed when the particles were calcinated at 900 8C. The thicknesses of the flakeshaped particles milled for 18, 20, 22, 24 h were about 3, 2.5, 2, and 1 mm, respectively, observed from the scanning electron microscopy (SEM) and backscattered electron (BSE). The maximum magnetization (M max ) at the maximum field (12 kOe) and coercivity (H c ) for the sample milled for 24 h is 111 emu g À1 and 56 Oe. The electromagnetic parameters and microwave absorbing properties are enhanced due to the thickness reduction. The results show that sample milled for 24 h has excellent EM wave absorbing properties and the peak frequency is located at 55 MHz with the reflection value of À39.0 dB for a thickness of d ¼ 5 cm. The flake-shaped particles are of high practical applications for EM interference/compatibility (EMI/EMC) in radio frequency.

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“…the electrical charge of flaky powders can be more easily polarized; 2. the space-change polarization and the exchange coupling reaction of the magnetic moment between particles are enhanced with increasing surface area; and 3. the eddy current loss is reduced as particle shape changes from spherical to flaky. 23,24 In addition, on the basis of the Landau-LifshitzGilbert (LLG) equation 25 :…”

Section: Electromagnetic Propertiesmentioning

confidence: 99%

“…þ il 00 r ) and complex permittivity (e r ¼ e 0 r þ ie 00 r ) for Fe-Ni-Cr powders after different milling times(25, 70, and 90 h).…”

mentioning

confidence: 99%

Investigation of the Absorption Properties of the Alloys Fe-Ni and Fe-Ni-Cr Prepared by Mechanical Alloying

Gu¹,

Duan

Duan³

et al. 2015

Journal of Elec Materi

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The microwave-absorption properties and microstructures of Fe-Ni and Fe-NiCr alloys prepared by mechanical alloying were investigated in the frequency range 2-18 GHz. Other properties were studied by scanning electron microscopy, x-ray diffractometry, vibrating sample magnetometry, and transmission line theory. Dependence of reflection loss (RL), electromagnetic properties (permeability l and permittivity e), magnetic and dielectric loss tangent, impedance matching, and absorber thickness (d) on milling time is discussed. The alloy powders had excellent microwave-absorption properties in the frequency range 7 to 14 GHz. The minimum RL, the frequency at which the RL is minimum, and the bandwidth (RL < À10 dB) all depend on milling time and d. Introduction of Cr affected the RL of the powders, especially the minimum RL of À19.8 dB at 7.2 GHz for Fe-Ni-Cr powder milled for 90 h (compared with À22 dB at 9.9 GHz for Fe-Ni powder milled for the same time), suggesting that the Fe-Ni-Cr alloy could be a promising candidate as a microwave-absorbing filler at low frequencies. This may help broaden the range of microwave-absorbing materials.

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Microwave complex permeability of planar anisotropy carbonyl-iron particles

Cited by 106 publications

References 29 publications

Flowerlike iron oxide nanostructures and their application in microwave absorption

Flowerlike iron oxide nanostructures and their application in microwave absorption

Particle thickness effect on electromagnetic properties of flake‐shaped FeNi alloy

Investigation of the Absorption Properties of the Alloys Fe-Ni and Fe-Ni-Cr Prepared by Mechanical Alloying

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