The role of strain on the magnetic properties of confined Fe3O4 nanocrystals in Al2O3 matrix
The role of strain on the magnetic properties of confined Fe3O4 nanocrystals in Al2O3 matrix
复制标题
DOI：
10.1016/j.matlet.2018.12.067
复制
发表时间：
2019-03
影响因子：
3
通讯作者：
Hang Zhou;C. Yuan;Yong Yang;Ting Yu;Xingfang Luo
中科院分区：
文献类型：
--
作者：
Hang Zhou;C. Yuan;Yong Yang;Ting Yu;Xingfang Luo
将纳米晶体分散在固态基质中是纳米器件应用的一种实用方法，它可以产生具有良好磁性能的非团聚纳米晶体。本工作采用一步法合成了非磁性Al2O3基体中的Fe3O4纳米晶。 HRTEM 分析证实了化学稳定的 Fe3O4 纳米晶体的形成。有限元计算和拉曼光谱表明 Fe3O4 纳米晶体受到 Al2O3 基体的压缩应变。观察到弱相互作用Fe3O4纳米晶体的典型磁性行为，其特征是超顺磁性。此外，还研究了应变对Fe3O4纳米晶体磁性能的影响。利用应变工程，为Fe3O4纳米晶体在磁性纳米器件中的应用铺平了道路。
Dispersing nanocrystals in solid state matrix is a practical way for the applications in nanodevices, which can yield production of non-agglomerated nanocrystals with good magnetic properties. In this work, Fe3O4nanocrystals in non-magnetic Al2O3matrix are synthesized by one-step method. HRTEM analyses confirm the formation of chemical stable Fe3O4nanocrystals. The finite element calculations and Raman spectra demonstrate that the Fe3O4nanocrystals experience compressive strain from Al2O3matrix. Typical magnetic behaviors of weakly interacting Fe3O4nanocrystals are observed, which are characterized by superparamagnetism. Moreover, the influence of strain on their magnetic properties of the Fe3O4nanocrystals are also investigated. By utilizing the strain engineering, it paves the ways for the applications of Fe3O4nanocrystals in magnetic nanodevices.