Magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsKunihiko Honda, Toshihiko Miura, Hiroaki Araki
Life of this patent
Estimating the term…
Abstract
A magnetic recording medium is described, having improved carrier noise ratio and weather resistance, by controlling the content and the crystal size of iron nitride which contains iron oxide or .epsilon.-Fe.sub.x N (2<x.ltoreq.3).
Claims8
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, wherein said ferromagnetic particles comprise iron nitride particles comprising iron oxide on the surface thereof in which the content of iron oxide(FeO.sub.x, 4/3.ltoreq.x.ltoreq.3/2) is from 0.5 to 10% (integral intensity ratio of X-ray diffraction peak) based on iron nitride (Fe.sub.4 N) and said iron nitride-containing iron oxide particles have a crystal size of from 150 to 250 .ANG. and are mainly comprised of .gamma.'--Fe.sub.3 N.sub.4.
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, wherein said ferromagnetic particles mainly comprising ferromagnetic iron nitride particles containing Fe.sub.2-3 N in an amount of from 0.01 to 3.0% (integral intensity ratio of X-ray diffraction peak) based on Fe.sub.4 N and having a crystal size of from 150 to 250 .ANG..
Dependencies are inferred from the claim text.