1. An apparatus, comprising: a circuit including a magnetic tunnel junction including a storage layer and a sense layer; and a field line configured to generate a magnetic field based on an input signal, wherein the magnetic tunnel junction is configured such that a magnetization direction of the sense layer and a resistance of the magnetic tunnel junction vary based on the magnetic field; wherein the circuit is configured to amplify the input signal to generate an output signal that varies in response to the resistance of the magnetic tunnel junction.