Patent ID: 8812066

Claim:
A system for measuring magnetic fields in a local environment of a device, the system comprising: a first superconducting quantum interference device (“SQUID”) comprising a closed superconducting current path formed by a planar loop of material that is superconducting below a critical temperature, wherein the closed superconducting current path is interrupted by at least one Josephson junction; wherein the first SQUID is integrated into the device such that the first SQUID is carried on a predominately planar surface of the device and the first SQUID is responsive to magnetic fields in the local environment of the device that are orthogonal to the predominately planar surface; a second SQUID comprising a closed superconducting current path formed by a planar loop of material that is superconducting below a critical temperature, wherein the closed superconducting current path of the second SQUID is interrupted by at least one Josephson junction and wherein the second SQUID is integrated into the device such that the second SQUID is carried on the predominately planar surface of the device; and wherein the closed superconducting current path of the first SQUID encloses a first area and the closed superconducting current path of the second SQUID encloses a second area, and wherein the second area is larger than the first area.