Patent ID: 6984977

Claim:
A scanning SQUID microscope for acquiring spatially resolved images of physical properties of an object, comprising: a SQUID sensor patterned on a substrate arranged substantially perpendicular to at least one surface under the test, said object being mounted on said surface, said SQUID sensor having a SQUID loop; said SQUID sensor detecting the tangential component B x of a magnetic field generated by said object in at least one relative position in said at least one surface under the test and generating an output signal corresponding to the magnetic field detected at said relative position; and a computational unit calculating current density j y (k x ,k y ,z) as: j y ( k x ,k y ,z )=2 k/[μ 0 ( e kz −1)] e− k(z+h) b x ( k x ,k y ,z ) where b x (k x ,k y ,z) is the Fourier transform of the magnetic field averaged over the SQUID loop, h is a height of the SQUID loop in the z-direction, and z is the vertical distance between said at least one surface under the test and an edge of the SQUID closest thereto.