Saturation magnetization parameters

The spinel ferrites were fabricated by solid state reaction technique. Cobalt and Zinc ferrites CoxZnyFe204,(x=0.7,0.3,0.4,0.2 and y=0.3,0.7,0.6,0.8) were prepared by solid state reaction technique. The crystalline structure of the sample was investigated by X-ray diffraction(XRD). All samples show cubic spinel structure. The lattice parameter decreases with increasing cobalt content. Magnetic properties shows that the prepared sample exhibit ferromagnetic behaviour at room temperature. The saturation magnetization increases with increasing cobalt content. Curie temperature... 

The magnetic properties of iron oxides can be determined using Mossbauer spectroscopy, neutron powder diffraction and magnetometry (see Chap. 7). The characteristic parameters are the magnetic moment, the permeability, the saturation magnetization, the magnetic anisotropy constants and the Bhf (Tab. 6.2). 

Gomert, P. Buske, N. (2000) Preparation, characterization and applications of ferro-fluids. 5 Intertech Conference, Berlin Goss, C.J. (1988) Saturation magnetization, coercivity and lattice parameter changes in the system Fe304 - y- Fe203, and their relationship to structure. Phys. Chem. Min. 16 164-171... 

Person 1 Calculate the saturation magnetization, Ms, for nickel ferrite, which has a lattice parameter of a = 0.833 nm. 

Intrinsic and Extrinsic Properties. The materials Fe, Co, and Ni and their alloys and oxides are mostly used for recording applications materials. Their magnetic properties are described by intrinsic and extrinsic parameters. The intrinsic properties (saturation magnetization, M,... 

EXAMPLE 18.2. Calculate the saturation magnetization of magnetite, [FejCL]. The lattice parameter of magnetite is about 0.839 nm. 

Metallic nickel has a saturation magnetization of 0.6 Wb/m2 and a lattice parameter of 0.352 nm. What is the magnetic moment per atom in Bohr magnetons ... 

Figure 3. Temperature dependence of the magnetoelastic stress parameter Br 2 oi La0 67Ca0i33MnO3 film. The continuous line is a fit by the Callen and Callen law [5Y-Br,2(T) = 5r 2(0)/5/2L 1[m(T)], where m(T)- reduced saturation magnetization and...

Fig. 51. Saturation magnetization, ns, expressed as the number of Bohr magnetons per molecule, Curie Temperature Te, and lattice parameter for the system Co3-iMnz04. (After Goodenough (215), data from Wickham and Croft (568).)...

Fig. 62 (continued), (b) Effective number of Bohr magnetons n u — h u/hb, ordering parameter i , and saturation magnetization ub in Bohr magnetons per molecule at 4° K as a fraction of the percentage of cobalt ions that are Colv. (After Goodenough (214) experimental points after Jonker and Van Santen (311).)... 

Coercivity and saturation magnetisation parameters are influenced by domain state (and hence by grain size of the magnetic fraction). Domain state in materials where the remanence is dominated by magnetite can be determined by position on a Day plot (Day et al., 1977) on such a plot, stability of remanence increases towards the upper left comer. Samples BC4, RC2, RC3, and RC5, all of which show evidence in their demagnetisation behaviour for the presence of a reversed-polarity component, plot closest to the stable part of the Day plot (Fig. 10). Samples BCl, BC3, BC5, and RCl 1, which do not show a clearly isolated reversed component, plot in less stable positions. Samples RC4 and RCl2, which have complex demagnetisation, plot as outliers, well to the less stable side of the plot. 

The nature of a spinel is described by a parameter X, the fraction of B atoms in tetrahedral holes some authors refer to the degree of inversion y (= 2X). For a normal spinel X = 0, and for an inverse spinel X =. Intermediate values are found (e.g. in a random spinel), and X is not necessarily constant for a given spinel but can in some cases be altered by appropriate heat treatment. For NiMn204 X varies from 0 37 (quenched) to 0-47 (slow-cooled). Values of X have been determined by X-ray and neutron diffraction, by measurements of saturation magnetization, and also by i.r. measurements. In favourable cases l.r. bands due to tetrahedral AO4 groups can be identified showing, for example, that in Li(CrGe)04 Li occupies tetrahedral positions. ... 

Effects of pressure on the magnetic parameters of some weak-ferromagnetic intermetallic compounds saturation magnetization, Tc is Curie temperature, KC = magnetovolume... 

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