摘要
粉末样品的Ｘ射线衍射和热磁曲线测量表明，所有的ＥｒＦｅ１１－ｘＣｏｘＴｉ（ｘ＝０—１１）化合物都结晶ＴｈＭｎ１２型结构，且具有良好的单相性．Ｃｏ替代Ｆｅ导致居里温度的显著提高和晶格常数的单调减小，４２Ｋ下的饱和磁化强度Ｍｓ随Ｃｏ含量的增加在ｘ＝３处呈现极大值．ＥｒＦｅ１１－ｘＣｏｘＴｉ化合物当ｘ≤４时，在室温下具有单轴磁晶各向异性，当６≤ｘ≤９时，样品的易磁化方向垂直于ｃ轴，而当ｘ继续增加时，易磁化方向又回到ｃ轴．ＥｒＦｅ１１－ｘＣｏｘＴｉ化合物磁晶各向异性的变化可能与不同过渡族晶位对磁晶各向异性的不同贡献和Ｃｏ的择优占位有关．通过研究磁化强度与温度的依赖关系（ＭＴ）还发现，所有ＥｒＦｅ１１－ｘＣｏｘＴｉ化合物都在居里温度以下的某一温度发生自旋重取向现象．基于磁场取向样品的Ｘ射线衍射和磁化强度的温度依赖关系。
Abstract X ray diffraction patterns and thermomagnetic curves show that all compounds are almost of single phase.All ErFe 11-x Co x Ti compounds ( x =0—11) crystallize in the ThMn 12 type structure.Substitution of Co for Fe leads to an increase of Curie temperature and a monotonic decrease of lattice constants.The composition dependence of saturation moments exhibits a maximum at about x =3. The easy magnetization direction (EMD) at room temperature,for x ≤4, is along the c axis, for 6 ≤x≤ 9, is perpedicular to the c axis, while for further increasing x , it goes back to the c axis. The interesting change of EMD of ErFe 11-x Co x Ti compounds may result from the preferential occupation of Co and the different contribution to the magnetocrystalline anisotropy from different transition metal sites.For all ErFe 11-x Co x Ti compounds, a spin reorientation occurs below the Curie temperature.A tentative phase diagram for ErFe 11-x Co x Ti compounds has been given.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第6期990-996,共7页
Acta Physica Sinica
基金
国家自然科学基金
国家教育委员会留学回国人员启动基金
