Perpendicular uniaxial magnetic anisotropy of Fe₁₆N₂(001) single crystal films grown by molecular beam epitaxy

The uniaxial magnetic anisotropies by torque measurement have been measured for Fe₁₆N₂(001) single crystal films grown by molecular beam epitaxy (MBE). It has been found that Fe₁₆ N₂(001) films exhibits perpendicular uniaxial anisotropy which makes the easy axis along the [001] direction, and those anisotropy constants K_U1 and K_U2 for Fe₁₆N₂ were 1.6×10⁷ and 0.4×10⁷ erg/cm³ respectively. Those K_U1 and K_U2 for Fe₁₆N₂ were constant in the thickness range from 34 to 83 nm. The ferromagnetic resonance of Fe₁₆N₂(001) single crystal films have been measured. The saturation magnetic flux densities, 4πM_s for Fe₁₆N₂ measured by the magnetic torques and resonance fields agreed well with the values measured with a vibrating sample magnetometer (VSM)