The magnetizations of single crystal (Fe1-xRux)(2)P have been measured
as a function of temperature (T) from 5 to 300 K and magnetic field (
H) up to 5.5 T. It is found that the substitution of Ru for Fe leads t
o the antiferromagnetic state for 0.02 less than or equal to x less th
an or equal to 0.06, and above x = 0.06, the magnetic state changes to
ferromagnetism again.