## Course of theoretical physics: Electrodynemics of continuous media |

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Page 144

Since the exchange energy depends only on the

magnetization, its value can change only when M changes in the magnetic field.

Although the latter change is, in general, very small, the exchange energy is

large compared ...

Since the exchange energy depends only on the

**magnitude**M of themagnetization, its value can change only when M changes in the magnetic field.

Although the latter change is, in general, very small, the exchange energy is

large compared ...

Page 145

In particular, if there are no internal stresses the change in the deformation

resulting from a change in the direction of magnetization is given by u“ = almxz, u,

, = azmxmy, etc. (42.5) It should be recalled that the

...

In particular, if there are no internal stresses the change in the deformation

resulting from a change in the direction of magnetization is given by u“ = almxz, u,

, = azmxmy, etc. (42.5) It should be recalled that the

**magnitude**of the deformation...

Page 335

The rays may be characterized by a vector s, whose direction is that of the group

velocity, while its

vector. Its significance is as follows. Let us consider a beam of rays (of a single ...

The rays may be characterized by a vector s, whose direction is that of the group

velocity, while its

**magnitude**is given by n-s= 1. (97.11) We shall call s the rayvector. Its significance is as follows. Let us consider a beam of rays (of a single ...

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angle anisotropy anisotropy energy antiferromagnetic atoms axes axis body boundary conditions calculation charge circuit coefﬁcient coefficients components conductor constant coordinates corresponding cross-section crystal Curie point curl H deﬁned deﬁnition denote dependence derivatives determined dielectric diffraction direction discontinuity dissipation domains electric ﬁeld electromagnetic ﬁeld electrons ellipsoid energy ﬂux expression external ﬁeld external magnetic ﬁeld ferroelectric ferromagnet ﬁeld H ﬁnd ﬁnite ﬁrst ﬁrst term ﬂow ﬂuctuations ﬂuid formula free energy frequency function given gives grad Hence incident induction inﬁnite integral isotropic Landau theory layer linear magnetic ﬁeld magnetohydrodynamics magnetostriction magnitude medium normal obtain optical particle permittivity perpendicular perturbation phase plane polarization PROBLEM propagated properties pyroelectric quantities reﬂection refraction relation respect result rotation satisﬁed scattering shock wave signiﬁcance solution sphere superconducting surface symmetry tangential temperature tensor theory thermodynamic potential transition uniaxial upper half-plane values variable velocity volume wave vector z-axis zero