Magnetars are pulsars with much stronger magnetic fields. As a result, they exhibit all kinds of weird characteristics, such as pulsing in the x-ray and giving off sporadic bursts of high energy emission. Sixteen such magnetars are known.
It is interesting to note how you even measure the magnetic field of such a distant and weird object. There is a well-known relation in pulsar physics that allows you to determine the dipole magnetic field strength (illustrated in the artist's conception above, outside the star) just from the period of the pulsar spin and the spin-down rate. The spin-down rate is the measure of how the pulsar rotation slows down as it ages and loses energy.
Enter SGR 0418+5729, detected in June 2009 when it went through several bursts indicative of magnetar behavior. This new x-ray pulsar and "soft-gamma repeater" had a period of 9.1 seconds, also typical for a magnetar. Follow-up observations continued for five months as astronomers waited for signs of pulsar spin-down. However, it never seemed to slow, to the detection limit of their instruments, before it got too close to the sun to be observed.
Starting in July of this year, astronomers marshalled the forces of several x-ray telescopes to monitor this strange pulsar again. In an article on Science Express, they report a new upper limit on the spin-down rate, which means they still have not reliably detected a slowing of the rotation. When you take this through the magnetic field calculations, you find that the dipole magnetic field has to be much lower than that of a magnetar, and that it instead lies in the range of normal pulsars.