An analysis of the rare earth contribution to the magnetic anisotropy in RCo5 and R2Co17 compounds

Neutron diffraction on TmNi4Al

“…This change of the magnetic structure from the hexagonal plane to the c-direction may be explained by the crystalline electric field (CEF) effect and the related second order Stevens factor. It changes its sign from negative for Nd, Tb and Dy ions to positive for Tm ion [23]. …”

Magnetic ordering in PrT2Ge2 (T = Ni, Ru and Rh) compounds

“…[32]). For negative value of B 0 2 the magnetic moment is expected to be parallel to the c-axis, while for positive value of B 0 2 it should be normal to the c-axis or form with it an angle 4.…”

Relation between stabilization energy, crystal field coefficient and the magnetic exchange interaction for Tb3+ ion

“…In the early 1970s, Greedan and Rao [ 1] had calculated the simplest Hamiltonian based on the magnetocrystalline anisotropy single ion model using the numerical method and presented the relation between the easy magnetizat ion direction ( the easy plane or the easy axis) of rare earth magnetic sublattice and the sign ( positive or negative) of crystal field coefficient B2 0 for RCo5( R= rare earth) and R2Co17 compounds. On these, the experimental facts of the easy magnetizat ion direction were interpreted for the compounds.…”

“…When the easy and hard magnet ization d-i rection along the axis or the plane, the stabil-i zation energy of R 3+ ion takes the maximum or the minimum of the magnetocrystalline anisotropy energy attributed by the R 3+ ion [ 1] . The main form of the Hamiltonian only contains the crystal field action and magnetic exchange interaction when employing single ion model to ca-l culate the magnetocrystalline anisotropy energy of 4-f ion in rare earth transition -metal intermetallic compounds.…”