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Magnetocrystalline volume anisotropy

The average anisotropy energy per volume unit one deduces from the thermal variation of (Ffobs) actually the average VIEg) This is not readily exploitable. Such a situation typically occurs when the anisotropy is a combination of, for instance, surface and volume (magnetocrystalline, magnetostatic) anisotropies (see Section C.)... [Pg.430]

In a single-domain particle of a-Fe203 the magnetization vector is held in the c-plane perpendicular to the c-axis by the magnetocrystalline field. Mossbauer studies use the 57Fe nucleus as the "observer to record when the relaxation time t becomes shorter than the period for precession of the nuclear spin about the direction of the effective field. Substitution into the equation for the Larmor frequency, or observer relaxation time, with an expression for the frequency factor proportional to the specific volume and anisotropy constant of the oxide gave (26, 27) the relationship ... [Pg.261]

Fe/Pt alloys are an important class of materials in permanent magnetic applications because of their large uniaxial magnetocrystalline anisotropy [Xu 7 x 10 J/m j [170] and good chemical stability. As the magnetic stability of individual particles scales with the anisotropy constant, K, and the particle volume, V, small Fe/Pt... [Pg.423]

Table 3. General characteristics of the three main groups of nanocrystalline materials produced by devitrification of amorphous alloys (Vcr - volume fraction of crystalline phase, D - diameter of nanocrystals, A - saturation magnetostriction constant, - averaged magnetocrystalline anisotropy, fff - fracture strength). Reprinted from (Kuhk, 2001), with permission from Elsevier. Table 3. General characteristics of the three main groups of nanocrystalline materials produced by devitrification of amorphous alloys (Vcr - volume fraction of crystalline phase, D - diameter of nanocrystals, A - saturation magnetostriction constant, <K> - averaged magnetocrystalline anisotropy, fff - fracture strength). Reprinted from (Kuhk, 2001), with permission from Elsevier.
Now, by taking into account the magnetocrystalline anisotropy, supposed with uniaxial symmetry, there is another limit volume such as... [Pg.299]


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See also in sourсe #XX -- [ Pg.728 , Pg.729 ]




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Magnetocrystalline

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