Planar coil magnetic transducer

A magnetic transducer comprising:

• a generally planar high resistivity substrate having a first major planar surface and an opposing second major planar surface;
• a generally planar first coil having one side secured to said first major planar surface of said substrate;
• a magnet positioned adjacent said second surface on the opposite side of said substrate from said generally planar first coil;
• said planar first coil including an inwardly winding conductive path from an outside connection terminal to an inside connection terminal;
• said first coil being copper formed on chromium;
• said substrate being formed of a ceramic material;
• said conductive path being formed of a plurality of connected conductive runs, each conductive run having a generally rectangular boundary and successively nested within one another, each conductive run having a width of about 5 microns, a spacing of about 5 microns, from an adjacent coil conductive run, and a height in the range of about 1 to 3 microns;
• a non-conducting passivating layer formed on said planar first coil;
• a generally planar second conductive coil having one side secured to said passivating layer on the side opposite from said first coil;
• a conductive interconnection extending through said passivating layer between said first and second coils;
• and
• said second conductive coil being formed of a plurality of connected conductive runs, each conductive run having a generally rectangular boundary and successively nested within one another.