Glassy dynamics in CuMn thin-film multilayers
Glassy dynamics in CuMn thin-film multilayers
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CuMn 薄膜多层膜中的玻璃态动力学
DOI：
10.1103/physrevb.95.054304
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发表时间：
2017
影响因子：
3.7
通讯作者：
R. Orbach
中科院分区：
文献类型：
--
作者：
Q. Zhai;David G. Harrison;D. Tennant;E. D. Dalhberg;G. G. Kenning;R. Orbach
薄膜多层自旋玻璃CuMn/Cu结构显示玻璃态动力学。测量了40层厚度为20.0nm的CuMn膜夹在厚度为nm的CuMn层之间的冻结温度。的肯宁效应，，示出遵循幂律动力学的相关长度增长从成核，导致。这里，是体自旋玻璃温度，和是从自旋玻璃动力学确定的常数，是相关长度增长到膜厚度的时间，是特征交换时间，和是平均Mn-Mn分离。对于，磁化动力学是简单激活的，具有不随时间变化的单个激活能Δmax（L）/kBTg=（1/c2）[ln（L/a0）-lnc 1]。所有这些参数的值都是在这些测量中探索的三个值中找到的。我们发现实验，1246，和1650 K，分别为三个CuMn薄膜多层厚度，符合幂律动力学。我们进行了类似的分析，基于液滴模型的激活动力学，并发现一个更大的传播比实验发现。
Thin-film multilayered spin-glass CuMn/Cu structures display glassy dynamics. The freezing temperaturewas measured for 40 layers of CuMn films of thickness, and 20.0 nm, sandwiched between nonmagnetic Cu layers of thicknessnm. The Kenning effect,, is shown to follow from power-law dynamics where the correlation length grows from nucleation as, leading to. Here,is the bulk spin-glass temperature,andare constants determined from the spin-glass dynamics,is the time for the correlation length to grow to the film thickness,is a characteristic exchange time, andis the average Mn-Mn separation. For, the magnetization dynamics are simple activated, with a single activation energy Δmax(L)/kBTg=(1/c2)[ln(L/a0)−lnc1] that does not change with time. Values for all these parameters are found for the three values ofexplored in these measurements. We find experimentally, 1246, and 1650 K, respectively, for the three CuMn thin-film multilayer thicknesses, consistent with power-law dynamics. We perform a similar analysis based on the activated dynamics of the droplet model and find a much larger spread forthan found experimentally.