Magnetic properis of Cr2AlC(Mn) thin films

Cr2AlC(Mn)薄膜的磁性能

• 批准号: 272363496
• 负责人: Professor Dr.-Ing. Christoph Leyens
• 金额: --
• 依托单位: Institut für Werkstoffwissenschaft
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/272363496?language=en
• 关键词: Magnetic; properis; Cr2AlC; Mn; thin

MAX phases in the form of thin films have recently attracted increased attention due to their crystal structure which combines a unique blend of metallic and ceramic properties. Cr2AlC is one of the most promising MAX phases for which a very good combination of high oxidation resistance and damage tolerance is obtained. The magnetic properties of the Cr2AlC have been neither experimentally nor theoretically previously investigated. From our own work it is known that the magnetic properties of the Cr2AlC layers are strongly dependent on the structure of the phase (solid solution or ordered nano-laminated structure).An important goal of this joint application is a quantitative determination of the relationships between the film production parameters, the structure and magnetic properties both of as deposited films and after thermal degradation (oxidation). The changes of the magnetic properties with the production and ageing process must be investigated in order to be able to develop a possible measurement method which can be used to help describe the state of the MAX phase thin films after production (in terms of quality control) and after use (in terms of controlling the condition of the layer). With this in mind a further goal of this work is to raise the transition temperature, which at the moment is in cryogenic temperature range, to room temperature. It is proposed that this will be achieved by doping of the Cr2AlC MAX phase with Mn. The experimental work is to be supported by and compared with thermodynamic calculations. A further goal of the proposal is to use the theoretical prediction and experimental evidence in order to control the magnetic properties of the Cr2AlC MAX phase and, thereby, increase its usage spectrum beyond that of a protective layer at higher temperatures in the direction of being a function layer.

由于其晶体结构结合了金属和陶瓷特性的独特混合物，最近以薄膜形式的最大相吸引了人们的注意力。 CR2ALC是最有希望的最大阶段之一，可获得高氧化耐药性和损伤耐受性的良好组合。 CR2ALC的磁性能尚未在实验上也没有在理论上进行过研究。从我们自己的工作中可以知道，CR2ALC层的磁性在很大程度上取决于相位的结构（实心解决方案或有序的纳米层压结构）。该联合应用的重要目标是定量确定膜生产参数之间的关系，即沉积膜的结构和磁性膜的结构和磁性脱脂型和热脱脂化（氧化）。必须研究随生产和老化过程的磁性变化，以便能够开发一种可能的测量方法，该方法可用于帮助描述生产后最大相薄膜的状态（在质量控制方面）和使用后（就控制层的状态而言）。考虑到这一点，这项工作的进一步目标是提高过渡温度，该温度目前处于低温温度范围内，到室温。建议通过使用Mn掺杂CR2ALC最大相。实验工作应由热力学计算支持并进行比较。该提案的另一个目标是使用理论预测和实验证据，以控制CR2ALC MAX相位的磁性特性，从而将其使用频谱增加到较高温度下在功能层方向上的保护层之外。