硅中嵌有MnSi $_{1.7}$纳米粒子：具有集体行为的超顺磁性
MnSi$_{1.7}$ nanoparticles embedded in Si: Superparamagnetism with a collective behavior
摘要：
Mn在Si中的掺杂由于可以制备Si基稀磁半导体而引起了人们的关注。然而，即使在非平衡生长条件下，Mn在Si中的低溶解度也有利于Mn离子的沉淀。MnSi $_{1.7}$纳米颗粒是常见的沉淀物，与MnSi $_{1.7}$体相相比，其显示出奇异的磁性。本文研究了MnSi $_{1.7}$纳米颗粒的静态和动态磁性能。利用Preisach模型，我们导出了单个粒子的磁化强度、矫顽场分布和粒子间相互作用场等磁性参数。随时间变化的磁化强度测量揭示了系统的自旋玻璃行为。
英文摘要：
The doping of Mn in Si is attracting research attentions due to the possibility to fabricate Si-based diluted magnetic semiconductors. However, the low solubility of Mn in Si favors the precipitation of Mn ions even at non-equilibrium growth conditions. MnSi$_{1.7}$ nanoparticles are the common precipitates, which show exotic magnetic properties in comparison with the MnSi$_{1.7}$ bulk phase. In this paper we present the static and dynamic magnetic properties of MnSi$_{1.7}$ nanoparticles. Using the Preisach model, we derive the magnetic parameters, such as the magnetization of individual particles, the distribution of coercive fields and the inter-particle interaction field. Time-dependent magnetization measurements reveal a spin-glass behavior of the system.
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