
395
7
Magnetic Nanosensors
7.1 Introduction
What is a magnetic sensor? It is a transducer that converts a magnetic eld into
an electrical signal.
A magnetic sensor is also required whenever a nonmagnetic signal is
detected by means of an intermediary signal detection into the magnetic
signal domain in a tandem transducer, for example, the detection of a cur-
rent through its magnetic eld or the mechanical displacement of a magnet.
Therefore, two groups of direct and indirect magnetic sensors are distinguishable.
Where are magnetic sensors used? Magnetic sensors have been employed for
a long time for applications such as current ...