Transformations of magnetic phase diagram as a result of insertion of hydrogen and nitrogen atoms in crystalline lattice of RFe11Ti compounds

The effect of hydrogen and nitrogen insertions on the magnetic anisotropy a nd spin-reorientation transitions of RFe11Ti compounds have been studied. T he obtained results are discussed on the basis of a model taking into accou nt the interaction of the quadrupolar moment of the 4f rare earth ion shell with the electric field gradient produced not only by the charges of the a mbient atom, but probably by the redistribution of states in the valence sh ells of the rare-earth ions and the conduction electron density. Tt is show n that the insertion of hydrogen and nitrogen atoms into the crystalline la ttice of rare earth compounds provides control of both magnitude and sign o f the magnetic anisotropy constants. (C) 2001 Elsevier Science BN: All righ ts reserved.