张道元
,
熊曹水
,
孙天富
,
王征
,
黄美清
金属学报
利用Mossbauer谱,磁测量技术对稀土合金SmFe_(10-x)Co_xTi系列的晶位及性质进行研究,实验分析表明,Fe被少量Co替代后,Co原子优先进入8f晶位;Co取代Fe明显提高化合物的Curie温度,饱和磁化强度与Fe的超精细物随Co的增多有类似的变化曲线,均在Co含量x=2处达到极大值。这主要由于掺入的Co影响了合金原子的交换作用,导致合金Curie温度上升。
关键词:
Mossbauer效应
,
crystallographic site
,
hyperfine field
,
exchange interaction
李维丹
,
谭晓华
,
任科智
,
刘洁
,
徐晖
金属学报
doi:10.11900/0412.1961.2015.00517
利用扫描速率法研究纳米晶复合永磁合金Nd8.5Fe76Co5Zr3B6.5Dy1, Nd9.5Fe75Co5Zr3B6.5Nb1和Nd9.5Fe75.4Co5Zr3B6.5Ga0.6的磁黏滞行为, 计算了合金的扰动场及磁交换长度, 分析了其交互作用、微观结构和磁性能之间的关系. 结果表明, 3种合金的扰动场分别为4.80, 4.87和5.09 kA/m; 磁交换长度差别不大, 分别为4.53, 4.41和4.20 nm. Nd9.5Fe75Co5Zr3B6.5Nb1合金的交互作用最强, 主要是因为合金中的晶粒尺寸细小(约为15 nm)且分布均匀. 3种合金均呈单一的硬磁特征, 其中Nd9.5Fe75.4Co5Zr3B6.5Ga0.6合金磁化反转的一致性最好, 使得其剩磁较高, 最大磁能积较大.
关键词:
纳米晶复合永磁合金
,
磁黏滞
,
交互作用
,
微观结构
李维丹
,
谭晓华
,
任科智
,
刘洁
,
徐晖
金属学报
doi:10.11900/0412.1961.2015.00517
利用扫描速率法研究纳米晶复合永磁合金Nd8.5Fe76C05Zr3B6.5Dy1,Nd9.5Fe75Co5Zr3B6.5Nb1和Nd9.5Fe75.4Co5Zr3B6.5Ga0.6的磁黏滞行为,计算了合金的扰动场及磁交换长度,分析了其交互作用、微观结构和磁性能之间的关系结果表明,3种合金的扰动场分别为4.80,4.87和5.09 kA/m;磁交换长度差别不大,分别为4.53,4.41和4.20 nm.Nd9.5Fe75Co5Zr3B6.5Nb1合金的交互作用最强,主要是因为合金中的晶粒尺寸细小(约为15 nm)且分布均匀.3种合金均呈单一的硬磁特征,其中Nd9.5Fe75.4Co5Zr3B6.5Ga0.6合金磁化反转的一致性最好,使得其剩磁较高,最大磁能积较大.
关键词:
纳米晶复合永磁合金
,
磁黏滞
,
交互作用
,
微观结构
Caiyin YOU
材料科学技术(英文)
Exchange interaction plays an important role on magnetic properties of nanocomposite magnets consisting of hard- and soft-magnetic phases. Here the exchange interaction in the Sm-Co/Co (and Fe65Co35) magnetic films was characterized by measuring static (mr(H)) and demagnetized (md(H)) remanence curves. According to conventional method: δm(H)=md(H)- [1- 2mr(H)], the exchange interaction was evaluated. The switching fields Hp′ and Hp, at which static (mr(H)) and demagnetized (md(H)) remanence show the fastest change, were identified. The relative ratio of switching fields H0p and Hp has a linear relationship with the maximum value δmmax of δm(H) curves, proposing an alternative way to characterize the exchange interaction.
关键词:
multi-layered films
,
films
,
exchange
,
interaction
Zhidong ZHANG+
,
Changheng WU
,
Zhenchen ZHONG
,
Xiaokai SUN
,
Y.C. Chuang
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China
材料科学技术(英文)
In present investigation exchange interactions of Pr_(n+1)Co_(3n+5)B_(2n)-type compounds have been evalu- ated in the light of molecular-field theory. The exchange interactions and ferromagnetism in these compounds are discussed in terms of lattice parameters and interatomic distance between Co atom.
关键词:
Pr-Co-B alloy
,
null
,
null