Yup, unless you have a high-power neodymium, but even then you'll just reduce the power. It'll still be stronger than a standard stir bar even after boiling. Just make sure it's coated in PTFE (teflon).
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I'm opening up!
twitter.com/twokidsbrewing .. facebook.com/twokidsbrewing .. twokidsbrewing.com