Magnetization propagation

The antiferromagnetic spin structure of YbNiAl was determined by neutron dif action experiments. Below Tn = 2.9K a sinusoidal modulated structure with an amplitude of /4=1.9(2))1b is observed (Ehlers et al. 1997). The magnetic propagation vector is m = [0.779(1)00], and the ytterbium magnetic moments lie perpendicular to the hexagonal c-axis. These investigations are paralleled by a detailed study of Al nuclear spin-lattice relaxation measurements (Fay et al. 1997). 

The temperature dependence of the magnetic propagation vector (fig. 3) has been ascribed (Elliott and Wedgewood 1963) to the effects of the superzone gaps in modifying the stable Q. It is also suggested (Evenson and Liu 1969) that the magnetostriction may modify the wave vector. 

S Stoner enhancement factor magnetic propagation vector... 

Plane-polarized electromagnetic radiation showing the electric field, the magnetic field, and the direction of propagation. 

In this discussion we define the x direction to be the direction of propagation of the light waves. This means that the yz plane contains the oscillating electrical and magnetic fields which carry the energy of the radiation. Only the electric field concerns us in scattering. Since the oscillation is periodic in both time t and location x, the electric field can be represented by the equation... 

Magnetic fields introduce hydromagnetic waves, which are transverse modes of ion motion and wave propagation that do not exist in the absence of an apphed B field. The first of these are Alfven, A, waves and their frequency depends on B and p, the mass density. Such waves move parallel to the apphed field having the following velocity ... 

Fig. 5.14. A shock wave is depicted propagating at wavespeed U through one leg of a magnetic core with thickness /. The inductance is L, the magnetic flux is w is the thickness of the core, and the change in magnetization is AM. The predicted currenttime pulse i(t) is linearly increasing.

Figure 4-1. Light as transverse electric ( ) and magnetic (5) oscillating fields normal to the propagation direction.

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