Domain wall pinning transition in an iron‐rich FeCu alloy
Domain wall pinning transition in an iron‐rich FeCu alloy
复制标题
富铁 FeCu 合金中的磁畴壁钉扎转变
DOI：
10.1063/1.344851
复制
发表时间：
1990
影响因子：
3.2
通讯作者：
P. Gaunt
中科院分区：
文献类型：
--
作者：
D. Ng;P. Gaunt
将富铁FeCu（1.07 at. % Cu）的α相固溶体试样在700 °C下热老化不同的持续时间。在热处理过程中，eCu发生沉淀和生长。将样品抛光并用透射电子显微镜检查。在不同的时效条件下，测定了析出物的尺寸、密度和形状。这些参数被拟合到强和弱畴壁钉扎模型中，从而可以预测矫顽场Hc的值。预测和测量的矫顽场之间的比较表明，弱钉扎理论与低年龄样品中观察到的Hc。对于时效超过1700 min的试样，强钉扎理论可以提供可接受的计算Hc值。还计算了每个试样在静态和动态下与每个钉扎的畴壁面积比有关的钉扎指数β'。低年龄样品的β'值<1，表明钉扎作用较弱。对于年龄较长的标本，...
Specimens of α‐phase solid solution of iron‐rich FeCu(1.07 at. % Cu) were thermally aged at 700 °C for different time durations. Precipitation and growth of eCu took place during the heat treatments. The specimens were polished and were examined with a transmission electron microscope. The size, density, and shape of the precipitates were determined for different aging conditions. These parameters were fit into the strong and weak domain wall pinning models, allowing values of the coercive field Hc to be predicted. Comparison between the predicted and measured coercive fields shows that weak pinning theory agrees with the observed Hc in low age specimens. For specimens aged over 1700 min, strong pinning theory can provide acceptable calculated Hc values. The pinning index β’ related to the ratio of the domain wall area per pin in the static and dynamic states is also calculated for each specimens. β’ values in low age specimens are found to be <1, which indicates weak pinning. For prolonged age specimens,...