Tunable magneto-Seebeck effect in Co2FeSi/MgO/Co2FeSi heterostructure via optimized interfacial engineering

Enhancing the tunneling magneto-Seebeck (TMS) ratio and uncovering its underlying mechanism are greatly demanded in spin caloritronics. The magnitude and sign of the TMS effect depend on the type of atom and the stacking order of atoms at the interfaces. Herein, we demonstrate that TMS ratios can be effectively manipulated by altering heterogonous or homogeneous interface through decoration on the CoFeSi (001) surface inserted on the MgO insulating layers. The maximum TMS ratio of pure Co2/O termination is 4565