Magnetocrystalline anisotropy of Y2Fe17-xGax

摘要: Abstract A detailed study of the structural and magnetic properties Y 2 Fe 17- x Ga ( = 0–8) has been carried out to investigate effects substitution on sublattice in general, magnetocrystalline anisotropy, particular. Powder X-ray diffraction reveals a transition from hexagonal Th Ni 17 structure for low concentrations rhombohedral Zn 7 high concentrations, with critical concentration c ∼ 3. An expansion unit cell volume substitution, slope about 2.9 3 /f.u./Ga atom, is observed. This saturates at 6. simple model which can be used extract anisotropy constant magnetization data magnetically aligned fixed powder samples (in case K 1 weakened by becomes uniaxial 11 6 . The linear increase field explained changes electronic after substitution. Curie temperature shows maximum 3–4, agreement literature value substituted R T (T Al, Ga, Si, Ti,...) compounds. average moment - varies 2.06μ B 0 1.83μ 4 10 K. plays more important role than atomic size determining 2:17 phases.