窒化鉄Fe_<16>N_2微粒子の磁化と磁気異方性

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We report on the magnetic properties of highly homogeneous Fe_<16>N_2 nanoparticles prepared by an ammonia nitrification method. Mossbauer spectroscopy experiments revealed the large hyperfine field characteristic of Fe_<16>N_2. TEM observation showed that the particles are covered with oxide shells. The saturation magnetization and the coercive force are 108emu/g and 3450 Oe, respectively. The angle dependence of the MH curves for the magnetically aligned samples indicates that the magnetic interaction between the particles is negligibly small, suggesting that the magnetocrystalline anisotropy is significantly large. Under the assumption that only the ferromagnetic core is responsible for magnetization, the magnetization and the anisotropy constant of the core Fe_<16>N_2 powders were estimated as 196±10emu/g of Fe and K^<fp>_<U1>=4.1±0.4×10^6erg/cm^3, respectively.
社団法人日本磁気学会の論文
2006-09-01