THz emission from Fe/Pt spintronic emitters with L1₀-FePt alloyed interface

Area of Science:

• Nanomagnetism
• Spintronics
• Terahertz (THz) Science

Background:

• Spintronic terahertz (THz) emitters leverage ultrafast spin dynamics.
• Ferromagnetic (FM)/non-magnetic (NM) heterostructures are key components in THz spectroscopy.
• Interface engineering is crucial for optimizing THz emission properties.

Purpose of the Study:

• Investigate the impact of the FM/NM interface on THz emission.
• Engineer Fe/Pt interfaces to enhance THz emission amplitude.
• Explore novel material designs for next-generation spintronic THz emitters.

Main Methods:

• Fabrication of Fe/Pt bilayers with an inserted L1₀-FePt alloy interlayer.
• Characterization of THz emission properties from engineered heterostructures.
• Analysis of the influence of interface alloying on THz signal generation.

Main Results:

• The Fe/L1₀-FePt (2 nm)/Pt trilayer exhibits significantly enhanced THz emission amplitude compared to a standard Fe/Pt bilayer.
• The extent of alloying at the interface directly influences the THz emission performance.
• Interface modification provides a pathway to tune and improve spintronic THz emitter efficiency.

Conclusions:

• Engineered interfaces, specifically using an ordered L1₀-FePt interlayer, dramatically improve THz emission in Fe/Pt heterostructures.
• This study highlights the critical role of interface structure in spintronic THz emitters.
• The findings open new avenues for material selection and design in advanced THz technologies.