This paper studies the normal state properties of itinerant electrons in a toy model, which is constructed according to the model for coexisting ferromagnetism and superconductivity proposed by Suhl [Suhl H 2001 Phys....This paper studies the normal state properties of itinerant electrons in a toy model, which is constructed according to the model for coexisting ferromagnetism and superconductivity proposed by Suhl [Suhl H 2001 Phys. Rev. Lett. 87 167007]. In this theory with ferromagnetic ordering based on localized spins, the exchange interaction J between conduction electrons and localized spin is taken as the pairing glue for s-wave superconductivity. It shows that this J term will first renormalize the normal state single conduction electron structures substantially. It finds dramatically enhanced or suppressed magnetization of itinerant electrons for positive or negative J. Singlet Cooper pairing can be ruled out due to strong spin polarisation in the J 〉 0 case while a narrow window for s-wave superconductivity is opened around some ferromagnetic J.展开更多
对比纳米复相永磁材料一维到三维的不同交换耦合作用模型,交换耦合作用会抑制软磁相的磁化反转,不同交换耦合作用模型对矫顽力影响不同。Henkel曲线δM峰值越高表明晶粒间交换耦合作用越强,一阶翻转曲线(first order reversal curve,FO...对比纳米复相永磁材料一维到三维的不同交换耦合作用模型,交换耦合作用会抑制软磁相的磁化反转,不同交换耦合作用模型对矫顽力影响不同。Henkel曲线δM峰值越高表明晶粒间交换耦合作用越强,一阶翻转曲线(first order reversal curve,FORC)相互作用峰值增高对应交换耦合作用增强。纳米复相永磁材料有效各向异性K_(eff)随晶粒尺寸减小而下降,当晶粒尺寸一定时,软磁相体积分数越高K_(eff)越低。为了得到最大磁能积高并且K_(eff)不低的纳米复相永磁材料,软磁相晶粒尺寸应在10 nm左右,软磁相体积分数不能超过50%。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 10574063)
文摘This paper studies the normal state properties of itinerant electrons in a toy model, which is constructed according to the model for coexisting ferromagnetism and superconductivity proposed by Suhl [Suhl H 2001 Phys. Rev. Lett. 87 167007]. In this theory with ferromagnetic ordering based on localized spins, the exchange interaction J between conduction electrons and localized spin is taken as the pairing glue for s-wave superconductivity. It shows that this J term will first renormalize the normal state single conduction electron structures substantially. It finds dramatically enhanced or suppressed magnetization of itinerant electrons for positive or negative J. Singlet Cooper pairing can be ruled out due to strong spin polarisation in the J 〉 0 case while a narrow window for s-wave superconductivity is opened around some ferromagnetic J.
文摘对比纳米复相永磁材料一维到三维的不同交换耦合作用模型,交换耦合作用会抑制软磁相的磁化反转,不同交换耦合作用模型对矫顽力影响不同。Henkel曲线δM峰值越高表明晶粒间交换耦合作用越强,一阶翻转曲线(first order reversal curve,FORC)相互作用峰值增高对应交换耦合作用增强。纳米复相永磁材料有效各向异性K_(eff)随晶粒尺寸减小而下降,当晶粒尺寸一定时,软磁相体积分数越高K_(eff)越低。为了得到最大磁能积高并且K_(eff)不低的纳米复相永磁材料,软磁相晶粒尺寸应在10 nm左右,软磁相体积分数不能超过50%。
