磁雪崩的定量标度
Quantitative scaling of magnetic avalanches
摘要：
我们提供了第一个定量巴克豪森噪声实验和最近的预测雪崩理论的钉扎接口之间的比较，无论是在和超越平均场。我们研究不同类别的软磁材料：多晶和非晶样品，其特征在于由长程和短程弹性，分别为厚和薄的样品，即有和没有涡流。详细分析了在固定尺寸下的时间雪崩形状，以及与尺寸和持续时间的联合分布相关的观测量。长距离和短距离的样品，没有涡流的理论预测拟合得非常好。特别是，短程样本提供了第一个可靠的测试理论超越平均场。厚的样品显示出与标度理论的系统偏差，为涡流的存在提供了明确的特征。
英文摘要：
We provide the first quantitative comparison between Barkhausen-noise experiments and recent predictions from the theory of avalanches for pinned interfaces, both in and beyond mean-field. We study different classes of soft magnetic materials: polycrystals and amorphous samples, characterized by long-range and short-range elasticity, respectively; both for thick and thin samples, i.e. with and without eddy currents. The temporal avalanche shape at fixed size, and observables related to the joint distribution of sizes and durations are analyzed in detail. Both long-range and short-range samples with no eddy currents are fitted extremely well by the theoretical predictions. In particular, the short-range samples provide the first reliable test of the theory beyond mean field. The thick samples show systematic deviations from the scaling theory, providing unambiguous signatures for the presence of eddy currents.
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