Studies on the magnetic viscosity and the magnetic anisotropy of γ-Fe 2 O 3 powders

Hou, Denglu; Nie, Xin; Luo, Haimin

doi:10.1007/s003390050646

Cited by 18 publications

(10 citation statements)

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“…The effective magnetic anisotropy K E is dictated by several features: K 2 E = K 2 sh + K 2 st + K 2 sur + 2 7 K 2 mc , where K sh , K st , K sur , and K mc are the shape, stress, surface, and magnetoctrystalline anisotropy, respectively [Hou 1998a, Hou 1998b]. The SEM micrographs (not presented) of the Fe 2 O 3 particles suggests a small aspect ratio < 1.1; therefore, K sh is believed to be negligible.…”

Section: Resultsmentioning

confidence: 99%

“…In this analysis, the magnetic anisotropy is determined in high field regimes (H H c ). The LATS model is given as [Yang 1996, Chikazumi 1997, Hou 1998a, Hou 1998b, Ranvah 2008]…”

Section: Resultsmentioning

confidence: 99%

“…Researchers have previously reported that an effective magnetic anisotropy K E incorporating all of these energies can be measured using magnetization saturation curves over broad temperature regimes [Chikazumi 1997, Hou 1998a, Hou 1998b, Ranvah 2008 using the law of approach to saturation (LATS) method. In this letter, the measurements of effective magnetic anisotropy K E as a function of temperature are correlated with magnetodielectric MD constant measurements for a Fe 2 O 3 particulate epoxy composite.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-dielectric and magnetic anisotropy maxima in γ-Fe₂O₃nanocomposite

et al. 2013

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The temperature dependence of the magneto-dielectric (MD) response in polycrystalline γ -Fe 2 O 3 nanoparticulates embedded in an epoxy resin has been experimentally investigated. A maximum in the MD coefficient (∼ 9%) occurs at ∼200 K, which is well below its Curie point (T c ∼ 948 K) and blocking temperature (T B = 310 K). The law of approach to saturation technique was used to measure the effective magnetic anisotropy K E over a broad temperature range. A maximum in the effective magnetic anisotropy appears at ∼200 K. The correlation between the maxima in K E and MD suggests that magnetic anisotropy may play a role in designing improved magneto-dielectric coupling in single-phase magnetic materials at the nanoscale.Index Terms-Magneto-electronics, γ -Fe 2 O 3 nanocomposite, magneto-dielectric, magnetic anisotropy, law of approach to saturation.

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Section: Resultsmentioning

confidence: 99%

“…In this analysis, the magnetic anisotropy is determined in high field regimes (H H c ). The LATS model is given as [Yang 1996, Chikazumi 1997, Hou 1998a, Hou 1998b, Ranvah 2008]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magneto-dielectric and magnetic anisotropy maxima in γ-Fe₂O₃nanocomposite

et al. 2013

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“…In the case of magnetic alloy, the molar ratios of initial reactants were Ni 2? /Fe 3 and procedure for preparation of magnetic alloy was the same as that of magnetic oxide. Inductively coupled plasma (ICP) analysis technique was used to determine the magnetic particles' compositions.…”

Section: Methodsmentioning

confidence: 99%

“…Magnetic oxide and magnetic alloy are two types of most investigated magnetic materials, and their synthesis and magnetic application have been extensively studied [1][2][3]. Spinel ferrite MnFe 2 O 4 is one of the most important magnetic oxides, and the Mn 2?…”

Section: Introductionmentioning

confidence: 99%

Sol–gel combustion synthesis of magnetic MnFe2O4 oxide and FeNi alloy: product dependence on the reduction ability

Cao

Qin

et al. 2014

Appl. Phys. A

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Based on the sol-gel combustion method, stoichiometric Fe 3? , Mn 2? , Ni 2? ions and citric acid were chosen as the initial reactants for the preparation of magnetic particles. Due to the different reduction ability of metal ions, completely different magnetic products (MnFe 2 O 4 oxide and FeNi alloy) were obtained by heating the flakes at 600°C under nitrogen atmosphere. MnFe 2 O 4 particles exhibit superparamagnetic behavior at room temperature, and martensitic phase transformation is observed magnetically at 125 K for FeNi alloy particles.

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Investigation of the Magnetic Properties of Nanocrystalline Fe3O4 Precipitated on the Surface of Chitin

Amulevicius¹,

Baltrūnas²,

Bendikienė

et al. 2002

phys. stat. sol. (a)

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Magnetic properties of nanocrystalline spherical Fe 3 O 4 particles deposited on a chitin surface were investigated, and the mechanisms of precipitation and magnetization were explained. The main investigations were performed by means of Mö ssbauer spectroscopy and by measurements of the saturation magnetization. The size of chitin particles used as magnetic carriers was 0.05-0.25 mm, and the Fe 3 O 4 particles were precipitated from a ferrofluid. The experimental results agreed well with the theoretical model of the superferromagnetic state. The remaining magnetic properties in nanometric Fe 3 O 4 particles were explained by collective magnetic interactions. It has been found that the saturation magnetization of magnetic carriers --nanocrystalline Fe 3 O 4 particles deposited on a chitin surface --is two or three times lower than that of bulk Fe 3 O 4 crystals of the same amount.

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Studies on the magnetic viscosity and the magnetic anisotropy of γ-Fe 2 O 3 powders

Cited by 18 publications

References 1 publication

Magneto-dielectric and magnetic anisotropy maxima in γ-Fe₂O₃nanocomposite

Magneto-dielectric and magnetic anisotropy maxima in γ-Fe₂O₃nanocomposite

Sol–gel combustion synthesis of magnetic MnFe2O4 oxide and FeNi alloy: product dependence on the reduction ability

Investigation of the Magnetic Properties of Nanocrystalline Fe3O4 Precipitated on the Surface of Chitin

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Studies on the magnetic viscosity and the magnetic anisotropy of γ-Fe 2 O 3 powders

Cited by 18 publications

References 1 publication

Magneto-dielectric and magnetic anisotropy maxima in γ-Fe2O3nanocomposite

Magneto-dielectric and magnetic anisotropy maxima in γ-Fe2O3nanocomposite

Sol–gel combustion synthesis of magnetic MnFe2O4 oxide and FeNi alloy: product dependence on the reduction ability

Investigation of the Magnetic Properties of Nanocrystalline Fe3O4 Precipitated on the Surface of Chitin

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Product

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Magneto-dielectric and magnetic anisotropy maxima in γ-Fe₂O₃nanocomposite

Magneto-dielectric and magnetic anisotropy maxima in γ-Fe₂O₃nanocomposite