Tunable neural electrode

A fabrication method comprising:

• providing a substrate having a surface;
• forming a signal line coupled to the substrate;
• forming an electrical pad coupled to the signal line;
• forming an electrode, such that the electrode is coupled to the signal line, the electrode comprises a network of randomly oriented conductive nanorods of diamagnetic material and paramagnetic in a ratio based on a physiological susceptibility property of a physiological tissue, wherein diamagnetic and paramagnetic are relative to the physiological tissue;
• and
• applying an insulation layer to the signal line.

A neural electrode array device comprising:

• a substrate;
• a signal line coupled to the substrate;
• an insulation layer covering the signal line;
• an electrical pad coupled to the signal line;
• and
• an electrode coupled to the signal line,
• wherein the electrode includes a network of randomly oriented conductive nanorods of diamagnetic material and paramagnetic material configured to reduce eddy current generation in a MRI system, wherein diamagnetic and paramagnetic are relative to a neural tissue.