At room temperature,the c-axis is the easy magnetization direction tn DyTiFen compound.However,when we decrease temperature,the thermal magnetic curves show that a spin reorientation takes place at about 175K.The anis...At room temperature,the c-axis is the easy magnetization direction tn DyTiFen compound.However,when we decrease temperature,the thermal magnetic curves show that a spin reorientation takes place at about 175K.The anisotropy constants of Ft sublattice have been determined by measuring the magnetocrystalline anisotropy of YTiFen,We have calculated the anisotropy constants of Dy by using single ion theory.The results demonstrate that the spin reorientation arises from the competition of magnetocrystalline anisotropy between Dy and Fe sublattices.The spin reorientation is explaned by the theo retical calculation.展开更多
The crystallographic and magnetic properties of Sm_(2) Fe_(17) N_(2) and Y_(2) Fe_(17) N_(2) have been investigated by using X-ray diffraction techniques and magnetic measurements.The effects of the interstitial nitro...The crystallographic and magnetic properties of Sm_(2) Fe_(17) N_(2) and Y_(2) Fe_(17) N_(2) have been investigated by using X-ray diffraction techniques and magnetic measurements.The effects of the interstitial nitrogen atoms on the Fe-Fe and R-Fe exchange interactions,iron 3d band structure and magnetocrystalline anisotropy induced by crystal field interactions in these nitride compounds are discussed.展开更多
The structural and magnetic properties of NdTiFe_(11)N_(0.5) and YTiFe_(11)N_(0.5) have been studied.The nitrides retain the tetragonal ThMn_(12) structure and their unit cell volumes slightly increase.The interstitia...The structural and magnetic properties of NdTiFe_(11)N_(0.5) and YTiFe_(11)N_(0.5) have been studied.The nitrides retain the tetragonal ThMn_(12) structure and their unit cell volumes slightly increase.The interstitial nitrogen atoms are found to increase the Curie temperature and saturation magnetization of the compounds,and especially have a strong effect on the magnetocrystalline anisotropy.展开更多
The magnetocrystalline anisotropy of SmTiFe_(11) Aas 6een studied.In addition to experimental investigations,the contribution of Sm^(3+) ion to the magnetocrystalline anisotropy of SmTiFe^(11) has been calculated usin...The magnetocrystalline anisotropy of SmTiFe_(11) Aas 6een studied.In addition to experimental investigations,the contribution of Sm^(3+) ion to the magnetocrystalline anisotropy of SmTiFe^(11) has been calculated using the single ion theory.The effect of the first excited state of Sm^(3+) has been taken into consideration in the calculations,and the calculated results are consistent with the experimental data.展开更多
Using neutron diffraction and magnetic measurement,we have measured the canting angle of the iron spin in Nd_(15)Fe_(78)B_(7) compound with powder samples.The iron spins rotate away from the c-axis by 26°34'a...Using neutron diffraction and magnetic measurement,we have measured the canting angle of the iron spin in Nd_(15)Fe_(78)B_(7) compound with powder samples.The iron spins rotate away from the c-axis by 26°34'at 77K.展开更多
文摘At room temperature,the c-axis is the easy magnetization direction tn DyTiFen compound.However,when we decrease temperature,the thermal magnetic curves show that a spin reorientation takes place at about 175K.The anisotropy constants of Ft sublattice have been determined by measuring the magnetocrystalline anisotropy of YTiFen,We have calculated the anisotropy constants of Dy by using single ion theory.The results demonstrate that the spin reorientation arises from the competition of magnetocrystalline anisotropy between Dy and Fe sublattices.The spin reorientation is explaned by the theo retical calculation.
文摘The crystallographic and magnetic properties of Sm_(2) Fe_(17) N_(2) and Y_(2) Fe_(17) N_(2) have been investigated by using X-ray diffraction techniques and magnetic measurements.The effects of the interstitial nitrogen atoms on the Fe-Fe and R-Fe exchange interactions,iron 3d band structure and magnetocrystalline anisotropy induced by crystal field interactions in these nitride compounds are discussed.
文摘The structural and magnetic properties of NdTiFe_(11)N_(0.5) and YTiFe_(11)N_(0.5) have been studied.The nitrides retain the tetragonal ThMn_(12) structure and their unit cell volumes slightly increase.The interstitial nitrogen atoms are found to increase the Curie temperature and saturation magnetization of the compounds,and especially have a strong effect on the magnetocrystalline anisotropy.
基金Project supported by the National Science Foundation of China。
文摘The magnetocrystalline anisotropy of SmTiFe_(11) Aas 6een studied.In addition to experimental investigations,the contribution of Sm^(3+) ion to the magnetocrystalline anisotropy of SmTiFe^(11) has been calculated using the single ion theory.The effect of the first excited state of Sm^(3+) has been taken into consideration in the calculations,and the calculated results are consistent with the experimental data.
文摘Using neutron diffraction and magnetic measurement,we have measured the canting angle of the iron spin in Nd_(15)Fe_(78)B_(7) compound with powder samples.The iron spins rotate away from the c-axis by 26°34'at 77K.
