Neutron diffraction study of HoFe11TiDx deuterides

A phenomenological model for the rare-earth contribution to the magnetic anisotropy in RFe11Ti and RFe11TiH

“…Furthermore, the model correctly predicts that DyFe 11 TiH adopts a basal magnetic phase at all temperatures below its Curie temperature of 600 K [8]. For HoFe 11 Ti the model predicts that the compound is axial between 4.2 K and its Curie temperature of 553 K, see figure 3, in agreement with the experimental results [4,11,21,28,48,52]. For HoFe 11 TiH, the model predicts a spinreorientation transition from an axial to a canted magnetic phase at 105 K, a temperature somewhat smaller than the experimental value of 150 K [11,48].…”

“…Indeed, in HoFe 11 Ti the sixthorder term dominates at zero kelvin and the net contribution of the holmium sublattice favours axial magnetocrystalline anisotropy. Because in HoFe 11 TiH theB 60 O 60 axial contribution is significantly smaller, see table 2, the basal B 20 O 20 and B 40 O 40 contributions can dominate at low temperatures and a spin-reorientation transition [21,48] occurs at 150 K.…”

“…For instance they exhibit different easy magnetization directions and spin-reorientation transitions, depending on both the rare-earth element and/or the presence of hydrogen [6][7][8]. Several authors have systematically been studying [9][10][11][12][13][14][15][16][17][18][19][20][21] the magnetic and Mössbauer spectral properties of the RFe 11 Ti and RFe 11 TiH compounds, where R is Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er and Lu, between 4.2 and 295 K.…”

A magnetic and Mössbauer spectral study of SmFe11Ti, LuFe11Ti, and their respective hydrides

“…Among the RFe 11 Ti compounds, where R is a rare earth, that crystallize in the ThMn 12 I4/mmm tetragonal structure [1][2][3][4][5][6][7][8], SmFe 11 Ti, GdFe 11 Ti, and LuFe 11 Ti exhibit [9] an axial magnetic anisotropy, an anisotropy, which is preserved [8][9][10][11][12] in their hydrides. The same behavior is observed [13] in CeFe 11 Ti and its hydride.…”