Magnetostriction constants

The magnetoelastic energy, simply related to the magnetostriction constants, can be written in the following form in the coordinate axes connected to the local anisotropy ... 

The magnetostriction constant, Awo, is calculated to be 1870 ppm at 50 K at the magnetic field of 12 T. To calculate this value the elastic constant difference cn - cn was evaluated to be 50 GPa using mechanical properties data [22], The measured value of A100 is very high, comparable to that... 

Table 9.2 Saturation magnetostriction constants for some polycrystalline ferrites...

Magnetostriction is defined as the change in dimensions of a magnetic sample during magnetization. This change is described by the magnetostriction constant... 

Table 4.16. Magnetostriction constant for some ferrites (polycrystalline samples).

The magnetostriction constant, is defined as the strain produced by a saturating magnetic field, and is dimensionless. A, = where Lq... 

Magnetostrictive constants in thin films 7 5.1-2.4. Sm-Co thin films 36... 

Fig. 6.31. Temperature dependence of the second and fourth order magnetostriction constants (C and A) for dysprosium, as deduced by Martin (1977) from Rhyne s (1965) strain measurements along a and b directions.

Gd has been thoroughly studied because the weak anisotropy (section 3.2) enables practical fields to align the magnetization in any desired direction specified by a,. Since the anisotropy is small, the magnetostriction constants are typically two orders of magnitude smaller than for the other elements we have... 

Chemical composition and a small amount of ingredient high permeability can be obtained by the composition of which magnetocrystalline anisotropy and magnetostriction constant are set to zero, respectively (Fig. 6.1.1). 

Curie temperature Magnetocrystalline anisotropy Magnetostriction constants Moo Mil... 

The parameters in this equation are the small-signal inductance L, the small-signal stiffness cm and the effective magnetostrictive constant du, compare Fig. 6.132. On the electrical side, the voltage Vg is the sum of the voltage evoked by induction and the voltage drop across the copper resistance R of the coil ... 

Here the coefficients 7e, 7s = 7a, and 7m correspond to the small-signal capacitance C, the effective piezoelectric charge constant dp and the inverse of the small-signal stiffness cp for a piezoelectric transducer and to the small-signal inductance L, the effective magnetostrictive constant du and the inverse of the small-signal stiffness cm for a magnetostrictive transducer, respectively. 

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.

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