ИСТИНА

Iron rich rare-earth intermetallic compounds RFe12 (R is a rare-earth element) with the ThMn12 structure have been considered as promising candidates for high performance permanent magnet material since the 1980’s. These compounds have high Curie temperature (Tc), saturation magnetization (μ0MS) and magnetocrystalline anisotropy (μ0HA) which are comparable with Nd2Fe14B [1]. Lately, they attract special attention not only due to their superior intrinsic magnetic properties at high temperature but also due to their low rare earth content in terms of being potential for delivering resource-saving and cost-effective technology. Recently, it was founded that Sm(Fe0.8Co0.2)12 thin film has excellent intrinsic magnetic properties superior to Nd2Fe14B (μ0MS ≈ 1.78T, μ0HA ≈ 12T, TC ≈ 860 K) [2]. But RFe12 compounds are thermodynamically unstable in the bulk state thus there is a need for stabilizing elements, such as Ti. Although, this leads to a reduction in saturation magnetization. For that reason, it is valuable to know the effect of Ti on phase stability and the μ0MS. The sole effect of Ti on intrinsic magnetic properties cannot be investigated in bulk form as ThMn12-phase cannot be stabilized for x < 0.9 in RFe12-xTix [3]. Hence, in this study, highly textured single phase (001) oriented epitaxial thin films Sm(Fe,Co)12-xTix are produced by DC magnetron cosputtering in order to investigate systematically the effect of Ti-substitution. The addiction of Ti increases the lattice parameter a, but keeps the c constant which leads to anisotropic volume expansion. The effect of Ti on intrinsic magnetic properties and phase stability will be discussed in this talk.