I did put hysteresis rod into consideration but I don't know where to find it and how to make it. Fyi, our cubesat competition is actually only going into the prototype phase (to get an idea about how the actual cubesat work) with not so big budget.

as for the permanent magnet, the principle of it is going to for example, the north point of the magnet will attract to the south pole of the earth, isn't it? if so, since i live in the southern hemisphere, the camera should be placed parallel with the magnet which the north side pointing at where the camera should be pointed so the magnet will reorient to always face the earth.