The roles of the exchange interaction between different magnetic ions in the gadolinium gallium garnet Gd3 Ga5O12 are systematically investigated. The effective field based on the exchange interaction is expressed as ...The roles of the exchange interaction between different magnetic ions in the gadolinium gallium garnet Gd3 Ga5O12 are systematically investigated. The effective field based on the exchange interaction is expressed as functions of the temperature T and applied field He. Furthermore, the effects of T and He on the magnetic moment and the entropy of GdsGa5O12 are studied in the ranges of 0 〈 He 〈 9 T and 3 〈 T 〈 40K. The computational results are consistent with the experimental data. Our study reveals that the applied field and temperature have important influences on the exchange interaction of Gd3 Ga5 O12 at low temperature.展开更多
在一些磁性材料内,磁性离子间交换作用和磁性离子的自旋涨落对材料磁性有影响.本文根据磁比热实验值确定了晶场参数后,利用包含自旋涨落的交换作用有效场Hm=n0(1+γT+βeωT)M,计算了Pr Ni2晶体晶场能级的Zeeman劈裂.在温度为3.8 K T 3...在一些磁性材料内,磁性离子间交换作用和磁性离子的自旋涨落对材料磁性有影响.本文根据磁比热实验值确定了晶场参数后,利用包含自旋涨落的交换作用有效场Hm=n0(1+γT+βeωT)M,计算了Pr Ni2晶体晶场能级的Zeeman劈裂.在温度为3.8 K T 30 K范围内,计算了该晶体多晶磁矩随外磁场的变化,以及外磁场H=5000 Oe时磁化率倒数随温度的变化,计算结果和实验值符合较好.当外磁场在0—50000 Oe时,计算的该晶体的磁熵变与已有文献的理论结果相似.计算结果说明,提出的包含自旋涨落的交换作用有效场不仅适合亚铁磁性晶体,而且也适合顺磁性晶体.展开更多
文摘The roles of the exchange interaction between different magnetic ions in the gadolinium gallium garnet Gd3 Ga5O12 are systematically investigated. The effective field based on the exchange interaction is expressed as functions of the temperature T and applied field He. Furthermore, the effects of T and He on the magnetic moment and the entropy of GdsGa5O12 are studied in the ranges of 0 〈 He 〈 9 T and 3 〈 T 〈 40K. The computational results are consistent with the experimental data. Our study reveals that the applied field and temperature have important influences on the exchange interaction of Gd3 Ga5 O12 at low temperature.
文摘在一些磁性材料内,磁性离子间交换作用和磁性离子的自旋涨落对材料磁性有影响.本文根据磁比热实验值确定了晶场参数后,利用包含自旋涨落的交换作用有效场Hm=n0(1+γT+βeωT)M,计算了Pr Ni2晶体晶场能级的Zeeman劈裂.在温度为3.8 K T 30 K范围内,计算了该晶体多晶磁矩随外磁场的变化,以及外磁场H=5000 Oe时磁化率倒数随温度的变化,计算结果和实验值符合较好.当外磁场在0—50000 Oe时,计算的该晶体的磁熵变与已有文献的理论结果相似.计算结果说明,提出的包含自旋涨落的交换作用有效场不仅适合亚铁磁性晶体,而且也适合顺磁性晶体.