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Perpendicular magnetic anisotropy in garnet-type ferromagnetic insulators used for inducing T-symmetry break in topological insulators

用于诱导拓扑绝缘体 T 对称破缺的石榴石型铁磁绝缘体中的垂直磁各向异性

基本信息

批准号：
310372030
负责人：
Dr. Andy Quindeau
金额：
--
依托单位：
Department of Materials Science and Engineering
依托单位国家：
德国
项目类别：
Research Fellowships
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/310372030?language=en
关键词：
Perpendicular magnetic anisotropy garnet type

项目摘要

I want to experimentally explore the physical properties and limitations of garnet thin films. Characteristics like magnetic coercivity, anisotropy and remanent magnetization will be quantified and discussed. I plan to conclude how these properties relate to the thin film growth conditions, stoichiometry, film thickness and crystal structure. Furthermore, I want to experimentally demonstrate proximity-induced magnetism with out-of-plane orientation in topological insulators.The primary objective of this project is to reproducibly create and controll the ferromagnetic garnet thin film Tm3Fe5O12 (TmIG) via pulsed laser deposition (PLD) with controllable perpendicular magnetic anisotropy (PMA) in respect to its coercivity and magnetization. Systematic trends of measured magnetic properties will be correlated to the stoichiometric and crystallographic properties. The secondary objective would include a broader study of different types of rare-earth garnets. Potential substituent materials are cerium, with its high magnetostriction (and magnetooptical activity), dysprosium, already used in liquid phase epitaxy garnet films to promote PMA, and dilution of the Fe with Al or Ga to reduce the magnetization and therefore the in-plane anisotropy which will be realized using self made PLD targets of the respective stoichiometry. Finally, by subsequent growth of topological insulators (TI), the existence of possible induced magnetism (lifting of the degeneracy) into the surface TI states will be experimentally investigated.

我想通过实验探索石榴石薄膜的物理特性和局限性。将量化和讨论像磁性，各向异性和剩磁特性。我计划总结这些属性如何与薄膜生长条件，化学计量，薄膜厚度和晶体结构。本课题的主要目的是利用脉冲激光沉积（PLD）技术制备出具有可控垂直磁各向异性（PMA）的铁磁石榴石薄膜Tm3Fe5O12（TmIG），并对其磁性和磁化强度进行控制。测量的磁性能的系统趋势将与化学计量和晶体学性质相关。第二个目标将包括对不同类型的稀土石榴石进行更广泛的研究。潜在的替代材料是具有高磁致伸缩（和磁光活性）的铈、已经用于液相外延石榴石膜以促进PMA的镝、以及用Al或Ga稀释Fe以降低磁化强度并因此降低面内各向异性，这将使用各自化学计量的自制PLD靶来实现。最后，通过拓扑绝缘体（TI）的后续生长，将实验研究可能的诱导磁性（简并度的提升）到表面TI状态的存在。