Dipole field

$$\mathbf{H}_\mathrm{dip}=-\frac{\Delta x^3}{4\pi} \sum_j{}\... ...3\frac{\mathbf{R}_j(\mathbf{M}_j\mathbf{R}_j)}{R_j^5} \right)$$

$\Delta x$	(m)	edge length of a cubic computational cell,
$\Sigma'$		sum over all other computational cells,
$j$		index of computational cell $j$,
$\mathbf{M}_j$	(A/m)	magnetization vector of computational cell $j$,
$\mathbf{R}_j$	(m)	vector from the current computational cell (for which the
		local field is calculated) to the computational cell $j$