Transient Spin Injection Efficiencies at Ferromagnet–Metal Interfaces. Issue 36 (19th October 2022)

• Record Type: Journal Article
• Authors: Elliott, Peter; Eschenlohr, Andrea; Chen, Jinghao; Shallcross, Sam; Bovensiepen, Uwe; Dewhurst, John Kay; Sharma, Sangeeta
• Is Part Of: Advanced materials interfaces. Volume 9:Issue 36(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-19
• Subjects: second harmonic generation -- spin injections -- spin–orbit coupling -- spintronics -- time‐dependent density functional theory -- ultrafast spin dynamics; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202201233
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Spin injection across interfaces driven by ultrashort optical pulses on femtosecond timescales constitutes a new way to design spintronics applications. Targeted utilization of this phenomenon requires knowledge of the efficiency of non‐equilibrium spin injection. From a quantitative comparison of ab initio time‐dependent density functional theory and interface‐sensitive, time‐resolved non‐linear optical experiment, the spin injection efficiency (SIE) at the Co/Cu(001) interface is determined, and its microscopic origin, i.e., the influence of spin‐orbit coupling and the interface electronic structure, is discussed. Moreover, we theoretically predict that the SIE at ferromagnetic–metal interfaces can be optimized through laser pulse and materials parameters, namely the fluence, pulse duration, and substrate material. Abstract : Spin injection across interfaces driven by ultrashort optical pulses on femtosecond timescales constitutes a new way to design spintronics applications. The efficiency of non‐equilibrium spin injection at ferromagnetic–metal interfaces is analyzed, and it is theoretically predicted that it can be optimized by varying the laser pulse and materials parameters, namely the fluence, pulse duration, and substrate material.