1. An apparatus, comprising: a plurality of circuits, each of the plurality of circuits having a distinct angular orientation and including multiple magnetic tunnel junctions, each magnetic tunnel junction being configured such that a resistance of each magnetic tunnel junction varies in response to a magnetic field; and a field line configured to generate a magnetic field for configuring an operating point of each of the plurality of circuits based on a current flow through the field line, wherein the field line includes a plurality of portions, each of the plurality of portions disposed adjacent to a corresponding one of the plurality of circuits, and each of the plurality of portions being configured such that the current flow through each of the plurality of portions has an angular orientation corresponding to the distinct angular orientation of the corresponding one of the plurality of circuits.