Magnetic Fluid Composition

Abstract

Provided is a magnetic fluid composition including: a metal magnetic particle; a nonmagnetic particle; and an ionic liquid, in which the ionic liquid contains a cationic group and an anionic group, the cationic group is one or more selected from the group including a quaternary ammonium ion, an imidazolium ion, a pyridinium ion, and a phosphonium ion, the anionic group is one or more selected from the group including a bis(fluorosulfonyl)amide ion, a (fluorosulfonyl(trifluoromethanesulfonyl)amide ion, a bis(pentafluoroethylsulfonyl)amide ion, a tris(trifluoromethanesulfonyl)methide ion, a trifluoromethanesulfonate ion, a thiocyanate ion, and a dicyanamide ion, and a volume average particle diameter of the nonmagnetic particle is more than 10 nm and 800 nm or less.

Dependencies are inferred from the claim text.