Static and high frequency magnetic properties of Mn–Co–Zr substituted Ba-ferrite

Ghasemi, Ali; Morisako, Akimitsu

doi:10.1016/j.jallcom.2007.02.101

Cited by 84 publications

(39 citation statements)

References 26 publications

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“…Different techniques have been used to prepare and characterize hexaferrite particles [7][8][9][10][11][12][13]. The magnetic properties of these materials have been tuned by substitution of Fe by different magnetic and nonmagnetic cations, and intensively investigated by different techniques [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Mahmood

Bsoul

2012

EPJ Web of Conferences

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Abstract. In this article, the thermomagnetic properties of a system of Ga-substituted barium hexaferrite nanoparticles (BaFe 12-x Ga x O 19 ) prepared by ball milling were investigated. The thermomagnetic curves for the samples with x ranging from 0.0 to 1.0 exhibited sharp peaks with high magnetization just below T C (Hopkinson peaks). The height of the peak for our samples was similar or larger than previously observed or calculated values. Theoretical treatment of the experimental data demonstrated that the peaks are due to the effect of superparamagnetic relaxations of the magnetic particle. This effect was confirmed by hysteresis measurements at, and just below the temperature at which the peak occurred. Consequently, the particle diameters were calculated from the experimental data using a theoretical model based on the superparamagnetic behavior of a system of uniaxial, randomly oriented, single domain, non-interacting particles. The calculated diameters of 11 -26 nm are less than the physical diameters determined from TEM measurements. The factors responsible for the low calculated values are discussed.

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Section: Introductionmentioning

confidence: 99%

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Mahmood

Bsoul

2012

EPJ Web of Conferences

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“…4b, minimum RL of −13 dB (90 % absorption) at 8.53 GHz for the sample with 36 GHz for the thickness of 2.6 mm has been achieved for x = 1.0 sample. It is known that Mtype hexagonal ferrites have high resonance frequency that can be shifted to lower frequency by substitution of Mn-Co-Zr [25]. Finally, it should be noticed that the main absorption mechanism in our samples is due to the dielectric properties.…”

Section: Resultsmentioning

confidence: 74%

Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite

Narang

Kaur

Bahel

2016

Materials Science-Poland

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M-type strontium ferrite with compositions SrFe (12−2x) Co x Ti x O 19 (x = 0.0, 0.3, 0.5, 0.7, 1.0), were prepared by two route ceramic method. The effects of Co-Ti substitution on their microstructure, electromagnetic properties, and microwave absorptive behavior were analyzed. The complex permittivity (ε -jε ) and complex permeability (µ -jµ ) have been measured from 8.2 to 12.4 GHz using a network analyzer. Scanning electron microscope was used to analyze the grain size distribution and porosity of the ferrite. X-ray diffraction confirmed the M-type structure of the doped strontium ferrite. Vibrating sample magnetometer was used to study hysteresis loop of the ferrite. This study suggests that the control of grain size, decrease in coercivity and enhanced values of dielectric constant and loss are effective means to improve microwave absorption. The dielectric constant and loss were enhanced in comparison to the permeability constant and loss over the entire frequency range.

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“…The decreased coercivity can be explained by two factors. For a uniaxial hexagonal compound, the anisotropic field (Ha) is expressed as follows (Ghasemi and Morisako 2008),…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Magnetic Biomorphic BaFe12-xCrxO19 Ceramics with Multilayer Wall Structure Made from Spruce Templates

Li¹,

Shu²,

Lei³

et al. 2016

BioResources

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*BaFe12-xCrxO19 (x = 0.0, 0.1, 0.2, 0.3, and 0.4) ferrite ceramics were prepared by a sol-gel method using spruce sapwoods as the templates. The prepared materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and a magnetic property measurement system (MPMS). The prepared materials maintained a multilayer wall structure of spruce sapwoods. All samples presented the single-phase of the magnetoplumbite barium hexaferrite. The saturation magnetization initially increased until it reached a maximum value at x = 0.2 and then decreased in three directions (parallel cross section, parallel radial section, and parallel tangential section). The coercivity decreased monotonously when measured in three directions. However, the coercivity was obviously lower in the parallel cross section direction than in the other directions because of the structural anisotropy caused by the multilayered wall structure.

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Static and high frequency magnetic properties of Mn–Co–Zr substituted Ba-ferrite

Cited by 84 publications

References 26 publications

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite

Magnetic Biomorphic BaFe12-xCrxO19 Ceramics with Multilayer Wall Structure Made from Spruce Templates

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Static and high frequency magnetic properties of Mn–Co–Zr substituted Ba-ferrite

Cited by 84 publications

References 26 publications

Hopkinson peak and superparamagnetic effects in BaFe12-xGaxO19nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe12-xGaxO19nanoparticles

Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite

Magnetic Biomorphic BaFe12-xCrxO19 Ceramics with Multilayer Wall Structure Made from Spruce Templates

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Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles

Hopkinson peak and superparamagnetic effects in BaFe_12-xGa_xO₁₉nanoparticles