STRUCTURE AND MAGNETISM OF RTiFe₁₁ COMPOUNDS （R=Nd,Sm,Gd,Tb,Dy,Ho,Er and Y）

【摘要】 <正> The crystallographic structure and intrinsic magnetic properties have been investigated in the RTiFe₁₁ compounds, where Rrepresents Nd, Sin, Gd, Tb, Dy, Ho, Er and Y. The magnetic structure and the exchange interaction between various magnetic ions in RT Fe₁₁ have been analysed. It is found that the intensity of R-Fe exchange interaction is proportional to（（?）—1）²J（J—1） for the heavy-rare-earth ions. while for the light rare earth, the effect caused by 5d-4f electron exchange interaction varying with rare-earth atoms must be taken into account. In RTiFe₁₁ compounds the interatomic distance dependence on the exchange interaction between Fe-Fe atoms has been observed, and the result of enhancing the Curie temperature has been obtained. The Fe atomic magnetic moment in RTiFe₁₁ is discussed in terms of the band theory, and the approach has been investigated on enhancement of saturation magnetization by means of substitution of atoms. RTiFe₁₁ compoumds reveal a variety of magnetocrystalline更多还原

【Abstract】 The crystallographic structure and intrinsic magnetic properties have been investigated in the RTiFe₁₁ compounds, where Rrepresents Nd, Sin, Gd, Tb, Dy, Ho, Er and Y. The magnetic structure and the exchange interaction between various magnetic ions in RT Fe₁₁ have been analysed. It is found that the intensity of R-Fe exchange interaction is proportional to（（?）—1）²J（J—1） for the heavy-rare-earth ions. while for the light rare earth, the effect caused by 5d-4f electron exchange interaction varying with rare-earth atoms must be taken into account. In RTiFe₁₁ compounds the interatomic distance dependence on the exchange interaction between Fe-Fe atoms has been observed, and the result of enhancing the Curie temperature has been obtained. The Fe atomic magnetic moment in RTiFe₁₁ is discussed in terms of the band theory, and the approach has been investigated on enhancement of saturation magnetization by means of substitution of atoms. RTiFe₁₁ compoumds reveal a variety of magnetocrystalline anisotropy behaviors. For Fe sublattice the easy magnetization direction and the variation of the anisotropy constants with temperature have been measured with X-ray and magnetic techniques. On the basis of the crystalline field theory, by using a single-ion model, the anisotropy conatants and their temperature dependence of the R ions have been calculated, which helps explain the spin reorientations observed in RTiFe₁₁.更多还原