The magnetic properties of the M-mica intercalation compounds (M=Mn,Fe,Co, and Ni) in which M elements form a two-dimensional lattice between mica layers have been investigated. The content of the intercalated M element, x, was varied up to about 22 wt. %, which is about 81% with respect to the upper limit of x. The ac susceptibility measurements revealed the magnetic ordering around 10 K for the Fe- (x≥8.0 wt. %), Co- (x≥7.4 wt. %), and Ni-mica intercalation compounds, but did not for the Mn-mica. These magnetic orders are considered to be the two-dimensional ones, caused from the intralayer superexchange interaction between M2+ (and Fe3+) ions.
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