Anisotropy in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>Phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>

Abstract

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.