RESUMO
We report the attainment of the ferromagnetic state in an interstitially modified heavy rare-earth-iron intermetallic compound in an external magnetic field. The starting composition is RE2Fe17, which is the RE-Fe binary richest in iron. We concentrate on the Tm-Fe compound, which is the most sensitive to magnetic field. The maximum possible amount of hydrogen (5 at.H/f.u.) is inserted into a Tm2Fe17 single crystal. We demonstrate that in a magnetic field of 57 T Tm2Fe17H5 reaches the ferromagnetic state with an enviably high polarization of 2.25 T.
RESUMO
The Lu(2)Fe(17-x)Mn(x)H(y), x = 0-2, y = 0-3, hydrides with the Th(2)Ni(17)-type crystal structure were prepared and their structural and magnetic parameters were studied. The lattice parameters measured at room temperature increase smoothly with H content. The magnetic measurements indicate that the Lu(2)Fe(17)H(y) hydrides (with y up to 1.77) are antiferromagnets at high temperatures and ferromagnets at low temperatures. The Lu(2)Fe(16.5)Mn(0.5) compound also has a high temperature antiferromagnetic state, but its hydrides are ferromagnets only. The Lu(2)Fe(17-x)Mn(x)H(y) hydrides, with x = 0.7 and 2, are ferromagnets with T(c) monotonically increasing with H content. The saturation magnetization measured for Lu(2)Fe(17-x)Mn(x)H(y), (x = 0,0.5,0.7,2 and 0
