Magnetic toner compositions

An emulsion aggregation toner comprising:

• at least one amorphous resin, at least one crystalline resin, and one or more optional ingredients selected from the group consisting of colorants, waxes, and combinations thereof;
• and
• at least one type of ferromagnetic nanoparticle comprising a metal selected from the group consisting of iron, cobalt, nickel, iron alloys, manganese alloys, barium alloys, and iron-cobalt alloys,
• wherein the ferromagnetic nanoparticle is spherical in shape, has a diameter of from about 1 nm to about 1000 nm, and possesses a circularity of from about 0.65 to about 1.

A process comprising:

• contacting at least one resin and at least one type of ferromagnetic nanoparticle in a mixture;
• aggregating the mixture at a pH from about 7 to about 9 to form particles;
• adjusting the pH of the mixture to from about 7 to about 12 to stop growth of the particles;
• coalescing the particles at a pH from about 8 to about 12 to form toner particles;
• and
• recovering the toner particles,
• wherein the ferromagnetic nanoparticle comprises a spherical shape possessing a circularity of from about 0.65 to about 1.