A mechanism of magnetic hysteresis in heterogeneous alloys

Stoner, Edmund C.; Wohlfarth, E.P.

doi:10.1098/rsta.1948.0007

Cited by 4,771 publications

(998 citation statements)

References 13 publications

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“…Since the AC current frequency is comparatively low, the magnetization reversal can be described in the framework of the quasi-static Stoner−Wohlfarth approximation [10]. For simplicity, we neglect the domain structure in the permalloy shell.…”

Section: Resultsmentioning

confidence: 99%

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Magnetization reversal process and nonlinear magneto-impedance in Cu/NiFe and Nb/NiFe composite wires

Антонов

Buznikov

Granovsky

et al. 2002

Journal of Magnetism and Magnetic Materials

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The magnetization reversal of Cu/NiFe and Nb/NiFe composite wires carrying AC current is studied. The frequency spectrum of a voltage induced in a pick-up coil wound around the wire is analyzed. The frequency spectrum is shown to consist of even harmonics within a wide range of AC current amplitudes and longitudinal DC magnetic fields. The strong dependencies of the harmonic amplitudes on the DC field are found. The results obtained may be of importance for the design of weak magnetic field sensors.

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Section: Resultsmentioning

confidence: 99%

“…A high sensitivity of the even harmonic amplitudes to the DC magnetic field is demonstrated. The experimental results are interpreted in terms of the Faraday law and the quasi-static Stoner−Wohlfarth model [10].…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal process and nonlinear magneto-impedance in Cu/NiFe and Nb/NiFe composite wires

Антонов

Buznikov

Granovsky

et al. 2002

Journal of Magnetism and Magnetic Materials

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show abstract

“…The Stoner-Wohlfarth model is a well-established phenomenological approach in order to describe coherent hysteretic magnetization reversal processes of single domain particles and magnetic thin films [1]. Although it does not take into account the influence of domain formation, its simplicity makes it a favorable first approach in order to interpret experimental data.…”

Section: Introductionmentioning

confidence: 99%

Exchange bias in a generalized Meiklejohn–Bean approach

Binek¹,

Hochstrat²,

Kleemann³

2001

Journal of Magnetism and Magnetic Materials

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A generalized Meiklejohn-Bean model is considered in order to derive an analytic expression for the dependence of the exchange bias field on the layer thickness involved in ferromagnetic/antiferromagnetic heterosystems, on the orientation of the applied magnetic field with respect to the magnetic easy axes and on the quenched magnetization M AF of the antiferromagnetic pinning layer. While M AF is a well-known feature of field-cooled dilute antiferromagnets, it seems to occur quite generally also in pure AF pinning substrates. The new analytic expressions are successfully compared with recent experimental results and Monte Carlo investigations. r

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“…Several methods, such as solvothermal / hydrothermal [10,11], vapor phase growth [12], vacuum calcining precursors [13], thermal decomposition [14], ultrasonic, gamma and microwave irradiation [15][16][17], chemical liquid homogeneous precipitation [18], and polyol synthesis [19] processes have been developed for the synthesis of Mn 3 O 4 NP's.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Characterization of PEG-Mn3O4 Nanocomposite

et al. 2011

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Abstract:Here, we report on the synthesis of PEG-Mn3O4 nanocomposite (NP's) via a hydrothermal route by using Mn(acac)2, ethanol, NH3 and PEG-400. The crystalline phase was identified as Mn3O4. The crystallite size of the PEG-Mn3O4 nanocomposite was calculated as 12±5 nm from X-ray line profile fitting and the average particle size from TEM was obtained as 200 nm. This reveals polycrystalline character of Mn3O4 NP's. The interaction between PEG-400 and the Mn3O4 NP's was investigated by FTIR. Temperature independent AC conductivity of PEG-Mn3O4 nanocomposite beyond 20 kHz provides a strong evidence of ionic conduction through the structure. The conductivity and permittivity measurements strongly depend on the secondary thermal transition of nanocomposite beyond 100℃. Above that temperature, Mn3O4 particles may interact with each other yielding a percolated path that will facilitate the conduction. On the other hand, the relatively lower activation energy (Ea=0.172 eV) for relaxation process suggests that polymer segmental motions of PEG and electrons hopping between Mn 2+ and Mn 3+ may be coupled in the sample below 100℃. Room temperature magnetization curve of the sample does not reach to a saturation, which indicates the superparamagnetic character of the particles. As the temperature increases, the frequency at which (ε ) reaches a maximum shifted towards higher frequencies. The maximum peak was observed at 1.4 kHz for 20℃ while the maximum was detected at 23.2 kHz for 90℃.

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A mechanism of magnetic hysteresis in heterogeneous alloys

Abstract: a r A t'a critic al value, h0, o f the field, for a given value of*, the angle o f magnetization c from K to & (or from f 0 to f 0). The relation most readily obtained is that between ton Ko

Cited by 4,771 publications

References 13 publications

Magnetization reversal process and nonlinear magneto-impedance in Cu/NiFe and Nb/NiFe composite wires

Magnetization reversal process and nonlinear magneto-impedance in Cu/NiFe and Nb/NiFe composite wires

Exchange bias in a generalized Meiklejohn–Bean approach

Hydrothermal Synthesis and Characterization of PEG-Mn3O4 Nanocomposite

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