Magnetic and crystallographic properties of Y2(Fe1−x Tx)14B (T=Al, Ti, Cr, Mn, and Ni)

Abstract

Y2(Fe1−xTx)14B (T=Al, Ti, Cr, Mn, and Ni) compounds have been studied by x-ray diffraction and magnetic measurements. Lattice constants increase with increasing the content of Ti, and decrease with the contents of Al, Cr, Mn, and Ni. Saturation magnetizations and magnetocrystalline anisotropies were measured with a field up to 70 kOe over the temperature range from 1.5 to 290 K. The composition dependences of Curie temperatures are also given. Saturation magnetizations and Curie temperatures both decrease monotonically with increasing the contents of T except Ni. When Fe is substituted by Ni, the Curie temperature increases slightly, but the saturation magnetization decreases linearly. In contrast with Y2Fe14B, magnetocrystalline anisotropies decrease with increasing temperature in the substituted Y2(Fe1−xTx)14B compounds. The results are discussed in terms of site preference and distance dependence of magnetic interactions.