Anisotropy in the B Phase of He 3
The magnetic anisotropy of the $B$ phase (assumed to be a Balian-Werthamer phase) is investigated within the Landau-Ginzburg theory. The anisotropy is determined by the action of the dipolar energy and the magnetic field on a single vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{n}}$ and it is shown that walls will induce variations in $\stackrel{\ensuremath{\rightarrow}}{\mathrm{n}}$ on a scale of ${R}_{C}\ensuremath{\sim}0.1$ cm. In the presence of a field $H$ this characteristic length becomes $\frac{{R}_{C}{H}_{B}}{H}$, where ${H}_{B}$ is of the order of 100 Oe.