98
CHAPTER 11. MAGNETIC ANISOTROPY
obtained in this way for several permanent-magnet materials by Strnat (1988) are shown in
Fig. 11.3.
Measurements of
can be helpful for obtaining an estimate of
Suppose that the
spontaneous polarization of the material is held in equilibrium by a field H normal to the
preferred direction, such that is inclined at an angle and hence at an angle
with
respect to H. The magnetic field H then exerts a torque
that tends to increase
The torque tending to return to the preferred direction is obtained by differentiating the
expression for the anisotropy energy
CHAPTER 11. MAGNETIC ANISOTROPY
obtained in this way for several permanent-magnet materials by Strnat (1988) are shown in
Fig. 11.3.
Measurements of
can be helpful for obtaining an estimate of
Suppose that the
spontaneous polarization of the material is held in equilibrium by a field H normal to the
preferred direction, such that is inclined at an angle and hence at an angle
with
respect to H. The magnetic field H then exerts a torque
that tends to increase
The torque tending to return to the preferred direction is obtained by differentiating the
expression for the anisotropy energy