铁磁应变玻璃的磁场诱发纳米应变畴转动机制及其功能效应的研究

应变玻璃(随机分布的纳米应变畴的冻结态)是形状记忆合金领域的新兴研究方向。申请人的前期研究表明，应变玻璃合金的纳米应变畴能在温度或应力的作用下发生转动，并能导致许多功能特性。最近，申请人研究发现了一种新形态的应变玻璃--铁磁应变玻璃，其纳米应变畴具有铁磁性。基于前期探索，本项目提出铁磁应变玻璃中存在磁场诱发纳米应变畴转动，且这一新机制能导致磁致伸缩和磁控阻尼效应。为探索这一研究设想，本项目拟在不同的铁磁应变玻璃体系中，研究磁场诱发纳米应变畴转动的基本特征。此外，还将系统研究这一机制所导致的磁致伸缩和磁控阻尼效应的基本特征，并探索改善这两种效应的有效方法。在此基础上，通过理论模拟探索磁场诱发纳米应变畴转动的物理起源。此研究将极大拓展应变玻璃的研究领域和应用范围，并为设计多功能磁性合金提供新原理和实验依据。

Strain glass (frozen state of randomly distributed nano-sized strain domains) is a new research field of shape memory alloy systems. The previous studies of the proposer demonstrate that the nano-sized strain domains of strain glass alloy can rotate to response to temperature and stress, which results in many functional properties. Recently, the proposer found a new form of strain glass-ferromagnetic strain glass, of which the nano-sized strain domains are ferromagnetic. Based on previous investigations, it is proposed that a new mechanism, the magnetic field induced rotation of nano-sized strain domains, exists in ferromagnetic strain glass system, which can lead to the magnetostriction and magnetically controlled damping effect. In order to study such a research ideal, the key features of the magnetic field induced rotation of nano-sized strain domains will be investigated in different ferromagnetic strain glass systems. The key features of its associated magnetostriction and magnetically controlled damping effect will be explored systematically. Moreover, the method for improving the performance of these two effects will be studied. Based on these studies, the physical origin of the magnetic field induced rotation of nano-sized strain domains will also be investigated through theoretical simulation. The present study will greatly extend the research and application field of strain glass. It will also provide new principle and experimental foundation for designing multifunctional magnetic alloys.