  Permanent magnet has a small and compact structure, is especially suitable
for a narrow space. With the aid of soft iron, the magnetic field can be
increased much more and the field uniformity can be well controlled. Most
Permanent magnets have a symmetry structure; the soft iron can be selected as
the float magnet pole to keep its constant scalar potential, and take roles as
media to collect the direct flux from the permanent blocks, then release
indirect flux in magnet aperture and to the nearby return yoke. This paper
presents the magnetic flux method to design and fabricate a hybrid permanent
dipole by using axially and radially magnetized permanent blocks. A variable
gradient permanent quadrupole and a variable gradient sextupole are designed as
the extend design examples . They all consist of two nested hybrid permanent
rings, where the iron poles are used to control the field quality, collect the
magnetic flux from the outer ring, block the skew quadrupole and high order
harmonics.
