Control of magnetocalorics by interface engineering in MAB phase and antiperovskite thin film model systems (B02)

将制备具有薄层FM和AFM的磁热材料(Mn3GaC相和Fe2AlB2MAB相)的原型薄膜系统和多层膜。磁热特性将通过磁热材料与铁磁(FM)或反铁磁(AFM)材料之间的交换耦合来控制。为了最大化绝热温度变化和调整转变温度，将测试不同的元素掺杂，并与A03、B05和A04项目一起表征磁响应。通过这种方法，我们的目标是匹配Mn3GaC中的AFM/FM和FM/PM相变，并在B03计划的密切作用下，将Fe2AlB2中的准二级相变设计为磁制冷的一级相变。

Prototype thin film systems and multilayers of the magnetocaloric materials (Mn3GaC phase and Fe2AlB2 MAB phase) with thin FM and AFM layers will be prepared. The magnetocaloric properties will be controlled by exchange coupling between the magnetocaloric material and a ferromagnetic (FM) or antiferromagnetic (AFM) material. To maximize the adiabatic temperature change and tune the transition temperature different elemental dopants will be tested and the magnetic response characterized together with projects A03, B05 and A04. In this way, we aim to match the AFM/FM and FM/PM phase transitions in Mn3GaC and engineer the quasi 2nd order phase transition in Fe2AlB2 towards a 1st order transition for magnetic refrigeration in close interaction with project B03.