Patent ID: 7015047

Claim:
A microdevice, which microdevice comprises: a) a magnetizable substance; b) a photorecognizable coding pattern, wherein said microdevice has a preferential axis of magnetization,and wherein an induced magnetization in its absolute magnitude along the preferential axis of the magnetization of said microdevice is at least 20% more than an induced magnetization of said microdevice along at least one other axis, wherein said microdevice has a thin rectangular shape with the preferential axis of the magnetization substantially in the direction of the length of the microdevice, and i) wherein said microdevice comprises at least two rectangular structures of said magnetizable substance separated by a non-magnetizable metal layer, and said microdevice has unequal number of said magnetizable substance rectangular structures on each side of said non-magnetizable metal layer along major axis of said microdevice; or ii) two rectangular structures of the magnetizable substance along the major axis of the microdevice and at least one of the rectangular structures has fingers on both ends, and c) a binding partner that is capable of binding to a moiety on a surface of the microdevice.