to meet near a central point to allow for collected magnetic fluid at its edges the fluid subsequently can easily be removed another embodiment of the invention will be described in conjunction with fig6 7 and 8 those of ordinary skill in the art will appreciate that a halbach array is a special arrangement of permanent magnets that cancel the magnetic field below one plane and increase the magnetic field above an opposite plane creating a one sided magnetic flux fig6 shows that a halbach array may be constructed using two vertically oriented magnets top left and two horizontally oriented magnets top right such that the magnetic fields add on the bottom of the magnet and cancel above it in these figures the arrow represents the orientation of the magnetic north and south pole with the arrowhead denoting the magnetic north pole fig7 shows a suitable configuration forming a halbach array this array uses cubic magnets resulting in a one sided magnetic flux the arrowhead and the circle represents the magnetic north pole orientation while the cross represents the magnetic south pole orientation with respect to fig8 a b and c a polycarbonate casing 20 holds magnets forming the halbach array the individual magnets are held together with screws that pass through the magnets in another embodiment of the invention the halbach array in the casing 20 is placed adjacent to the cylindrical magnets 14 as shown in fig9 as with the earlier embodiment water and a magnetic ferrofluid were placed in a vessel as can be seen in fig9 the magnetizable ferrofluid was attracted to the top of the magnets 14 and then jumped across onto the halbach array 20 from which it can easily be recovered through.