Determination of initial magnetization curve from crystallites size and effective anisotropy field

Globus, A.; Duplex, P.; Guyot, M.

doi:10.1109/tmag.1971.1067200

Cited by 254 publications

(59 citation statements)

References 5 publications

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“…It is observed from Figure 7 that the K , where M s is the saturation magnetization; K 1 is the anisotropy constant [22]. In our present study of microstructure, it is seen that the D increases significantly with Cu 2+ content.…”

Section: Magnetic Properties Ofsupporting

confidence: 57%

“…Therefore, the increase of  decreases at higher frequencies. This is due to the fact that at higher frequencies impurities between grains and intragranular pores act as pinning points and increasingly hinder the motion of spin and domain walls thereby decreasing their contribution to permeability and also increasing the loss [22].…”

Section: Magnetic Properties Ofmentioning

confidence: 99%

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Structural and Magnetic Properties of Mn0.50-xZn0.50CuxFe2O4

Alam¹,

Khan²,

Das³

et al. 2013

MSA

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ABSTRACTcontent. It is observed that both density and initial permeability increase with increasing sintering temperature. The maximum initial permeability is found to be 1061 which is almost four times greater than that of the parent composition. The resonance frequency of all the samples shifts towards the lower frequency as the permeability increases with Cu 2+ content. It is observed from B-H loops of Mn 0.50-x Zn 0.50 Cu x Fe 2 O 4 that coercivity decreases and retentivity increases with Cu 2+ content. Possible explanations for the observed magnetic properties with various Cu 2+ contents are discussed.

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Section: Magnetic Properties Ofsupporting

confidence: 57%

Section: Magnetic Properties Ofmentioning

confidence: 99%

Structural and Magnetic Properties of Mn0.50-xZn0.50CuxFe2O4

Alam¹,

Khan²,

Das³

et al. 2013

MSA

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“…7 we have plotted the K values previously published [3,4]. Concerning A , a t our knowledge there So it follows that the wall energy is determined by taking Kl into account, while the wall thickness is related to K .…”

Section: Wall Energy Componentsmentioning

confidence: 99%

Determination of the domain wall energy from hysteresis loops in YIG

Guyot

Globus

1973

Physica Status Solidi (b)

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The energy lost by the continuous pinning and depinning of the domain wall as it moves and the energy lost by the formation and destruction of a fraction of the wall surface may be the origin of the losses which find their expression in the hysteresis loop. This new hypothesis, based on Globus' model, allows to calculate the wall energy y and the pinning force ! .Experimentally, only a simple measurement of the loop areas is needful to calculate the y value, which is in very good agreement with theoretical values deduced from the theory of Landau and Lifshits. I n addition, the y values measured are proportional to the global anisotropy of polycrystals K (K = Kl + a,, As), that results in a very small wall thickness Theoretical ConceptsI n addition t o the standard ideas, this paper is based on the following theoretical concepts : a ) a "grain boundary limited wall model" with the wall size changing while the wall moves inside a spherical grain [l to 31; b) in ferrimagnetic polycrystalline materials, the existence of a global anisotropy K which includes, in addition t o the magnetocrystalline anisotropy K,, a magnetoelastic term a,, where the natural stresses a, are specific t o the composition [ l , 2, 41. (These stresses would be related to the fact that in polycrystalline materials the well-known strain occurring at the Curie temperature cannot exist in a grain because of the different crystallographic orientation of the neighbouring grains).The experimental data used to reach these concepts are the following:

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“…Permeability in magnetic materials originates because of the spin rotation and domain wall motion which is due to the fact that at higher frequencies, pinning points are found to be originated at the surface of the samples from the impurities of grains and intragranular pores. This phenomenon in turn obstructs the motion of spin and domain walls and the contribution of their motion towards the increment of permeability decreases [29]. On the other hand, it is difficult to explain compositional dependence of i The loss is mainly due to mainly due to the phase lag of domain wall motion with respect to the applied field.…”

Section: Complex Initial Permeabilitymentioning

confidence: 99%

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca1-xSrx(Fe0.5Ta0.5)O3 Multiferroic Ceramics

Bhuiyan¹,

Gafur²,

Khan³

et al. 2017

MSA

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Conventional solid state reaction technique was used to synthesize Ca 1−x Sr x (Fe 0.5 Ta 0.5 )O 3 multiferroic ceramics (where x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5). Powder of ingredients was mixed thoroughly in stoichiometric amount and calcined at 1150˚C for 5 h. Disk and toroid shaped samples prepared from each composition were sintered at 1450˚C for 5 h. The XRD analysis confirms that all compositions are single phase cubic perovskite structure. The theoretical and bulk density increases with increase of Sr content, which may be attributed to the fact that the atomic weight and density of Sr are larger than those of Ca. The average grain size increased with increasing Sr content up to x = 0.2, and then decreased with further increase of Sr content. Frequency dependent dielectric constant shows usual dielectric dispersion at lower frequencies due to Maxwell-Wagner type interfacial polarization. The higher values of real and imaginary part of impedance at lower frequencies are also due to the fact that all kinds of polarization mechanism are present and increase with Sr content indicating the enhancement property of the composition. The continuous dispersion on increasing frequency contributes to the conduction phenomena. Two semicircles correspond to the grain boundary and grain resistance separately. The complex modulus analysis reveals the polaron hopping and negligibly small contribution of electrode effect. The continuous dispersion on increasing frequency may be contributed to the conduction phenomena. The ac conductivity, σ ac , was derived from the dielectric measurement and it increases with increase of frequency for all the compositions and can also be explained on the basis of polaron hopping mechanism. At higher frequencies conductive grains are more active, and thereby increases of hopping of charge carrier contribute to rise in conductivity. The real part of initial permeability increased with increasing Sr content up to x = 0.2, and 65then decreased further increasing the Sr content. Firstly, it increased due to the higher values of grain size, and then decreased with the Sr content due to the lowering the grain size. The saturation magnetization, M s , increases for x = 0.2 and then decreases with increasing Sr content due to the pore acted as a pinning centre of electron spin; thereby Ms decreases also due to the grain size which is well supported by the permeability results. The decrease of magnetoelectric voltage coefficient α ME with content may be attributed to the increased porosity in the sample. The presence of the pores breaks the magnetic contacts between the grains. The highest value of α ME is 42.22 mV·cm −1•Oe −1 for the composition x = 0.2 which is attributed to the enhanced mechanical coupling. It was revealed that there is a dramatic influence of Sr with content x = 0.2 and also has strong correlations on grain size as well as magnetic and magnetoelectric properties.

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Determination of initial magnetization curve from crystallites size and effective anisotropy field

Cited by 254 publications

References 5 publications

Structural and Magnetic Properties of Mn<sub>0.50-x</sub>Zn<sub>0.50</sub>Cu<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub>

Structural and Magnetic Properties of Mn<sub>0.50-x</sub>Zn<sub>0.50</sub>Cu<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub>

Determination of the domain wall energy from hysteresis loops in YIG

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca<sub>1-x</sub>Sr<sub>x</sub>(Fe<sub>0.5</sub>Ta<sub>0.5</sub>)O<sub>3</sub> Multiferroic Ceramics

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Determination of initial magnetization curve from crystallites size and effective anisotropy field

Cited by 254 publications

References 5 publications

Structural and Magnetic Properties of Mn&lt;sub&gt;0.50-x&lt;/sub&gt;Zn&lt;sub&gt;0.50&lt;/sub&gt;Cu&lt;sub&gt;x&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;

Structural and Magnetic Properties of Mn&lt;sub&gt;0.50-x&lt;/sub&gt;Zn&lt;sub&gt;0.50&lt;/sub&gt;Cu&lt;sub&gt;x&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;

Determination of the domain wall energy from hysteresis loops in YIG

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca&lt;sub&gt;1-x&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;(Fe&lt;sub&gt;0.5&lt;/sub&gt;Ta&lt;sub&gt;0.5&lt;/sub&gt;)O&lt;sub&gt;3&lt;/sub&gt; Multiferroic Ceramics

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Structural and Magnetic Properties of Mn<sub>0.50-x</sub>Zn<sub>0.50</sub>Cu<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub>

Structural and Magnetic Properties of Mn<sub>0.50-x</sub>Zn<sub>0.50</sub>Cu<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub>

Correlations of Structural, Dielectric, Magnetic and Magnetoelectric Properties of Ca<sub>1-x</sub>Sr<sub>x</sub>(Fe<sub>0.5</sub>Ta<sub>0.5</sub>)O<sub>3</sub> Multiferroic Ceramics