非晶铁磁薄膜中巴克豪森噪声的统计特性
Statistical properties of Barkhausen noise in amorphous ferromagnetic films
摘要：
我们研究了厚度在$100$和$1000$ nm之间的非晶铁磁薄膜中巴克豪森噪声的统计特性。从巴克豪森噪声的时间序列测量与传统的归纳技术，我们进行了广泛的统计分析，并建立标度指数$τ$，$α$，$1/σνz$，和$\vartheta$。我们还专注于雪崩的平均形状，这给出了进一步的指示畴壁动力学。根据实验结果，我们分组的非晶薄膜在一个单一的普适性类，其特征在于标度指数$τ\sim 1.27$，$α\sim 1.5$，$1/σνz \sim \vartheta \sim 1.77$，值类似于几个散装非晶磁性材料。此外，我们还验证了雪崩形状依赖于普适类。通过考虑文献中发现的由外部磁场通过无序介质驱动的铁磁畴壁的动力学的理论模型，我们解释了结果，并确定了实验证据，这些非晶薄膜，在此厚度范围内，提出了一个典型的三维磁行为与主导短程弹性相互作用的畴壁动力学。此外，我们还为非平均场系统平均雪崩形状的一般缩放形式的有效性提供了实验支持。
英文摘要：
We investigate the statistical properties of the Barkhausen noise in amorphous ferromagnetic films with thicknesses in the range between $100$ and $1000$ nm. From Barkhausen noise time series measured with the traditional inductive technique, we perform a wide statistical analysis and establish the scaling exponents $τ$, $α$, $1/σνz$, and $\vartheta$. We also focus on the average shape of the avalanches, which gives further indications on the domain wall dynamics. Based on experimental results, we group the amorphous films in a single universality class, characterized by scaling exponents $τ\sim 1.27$, $α\sim 1.5$, $1/σνz \sim \vartheta \sim 1.77$, values similar to that obtained for several bulk amorphous magnetic materials. Besides, we verify that the avalanche shape depends on the universality class. By considering the theoretical models for the dynamics of a ferromagnetic domain wall driven by an external magnetic field through a disordered medium found in literature, we interpret the results and identify an experimental evidence that these amorphous films, within this thickness range, present a typical three-dimensional magnetic behavior with predominant short-range elastic interactions governing the domain wall dynamics. Moreover, we provide experimental support for the validity of a general scaling form for the average avalanche shape for non-mean-field systems.
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