Local Strain Dependence of Uniaxial Magnetic Anisotropy in M-type Ferrites

抄録

  We study the magnetic anisotropy (MA) of magnetoplumbite (M)-type ferrites by calculating the electronic structure of clusters formed with an Fe³⁺ ion and O^2- ions. Spin-orbit interaction (LS coupling) is taken into account. It is shown that the p-d mixing between the Fe and O ions and local lattice distortion are crucial to understand the MA of M-type ferrites. Calculations of MA for M-type ferrites doped with Fe²⁺ or Co²⁺ ions demonstrate the importance of local lattice distortion on MA. It is shown that Fe²⁺ ions doped into 2a-site produce metamagnetic character when a compressive deformation along c-axis is introduced. It is also shown that the Co²⁺ ions doped onto 4f₁ site may enhance the uniaxial MA when a compressive deformation is introduced.