Substrate Induced Strain Field in FeRh Epilayers Grown on Single Crystal MgO (001) Substrates.

摘要: Equi-atomic FeRh is highly unusual in that it undergoes a first order meta-magnetic phase transition from an antiferromagnet to ferromagnet above room temperature (Tr ≈ 370 K). This behavior opens new possibilities for creating multifunctional magnetic and spintronic devices which can utilise both thermal applied field energy change state functionalise composites. A key requirement realising the need understand control properties of extreme thin film limit (tFeRh < 10 nm) where interfaces are crucial. Here we determine films thickness range 2.5–10 nm grown directly on MgO substrates. Our magnetometry structural measurements show perpendicular strain exists these results increase as reduced. Modelling using spin dynamics approach supports experimental observations demonstrating critical role atomic layers close interface.