Magnetic Curable Inks

A curable magnetic ink comprising:

• (a) an ink carrier which comprises at least one curable monomer, oligomer, or prepolymer;
• (b) at least one initiator;
• and
• (c) carbon-coated magnetic nanoparticles having a core which is (i) iron, (ii) cobalt, (iii) nickel, (iv) manganese, (v) an alloy of iron, cobalt, nickel, manganese, or a mixture thereof, (vi) CoPt, (vii) fcc phase FePt, (viii) fct phase FePt, (ix) FeCo, MnAl, (x) MnBi, (xi) Co-covered fct phase FePt, or (xii) a mixture of one or more of i through xi;
• said ink being curable upon exposure to ultraviolet radiation;
• said carbon-coated magnetic nanoparticles exhibiting a coercivity of from about 200 to about 50,000 Oersteds;
• said carbon-coated magnetic nanoparticles exhibiting a magnetic saturation moment of from about 20 to about 150 emu/g.

A process which comprises:

• (1) incorporating into an ink jet printing apparatus a curable magnetic ink comprising:
• (a) an ink carrier which comprises at least one curable monomer, oligomer, or prepolymer;
• (b) at least one initiator;
• and
• (c) carbon-coated magnetic nanoparticles;
• said ink being curable upon exposure to radiation;
• (2) melting the ink;
• (3) causing droplets of the melted ink to be ejected in an imagewise pattern onto a substrate;
• and
• (4) exposing the imagewise pattern to curing radiation.