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Interface morphology driven exchange interaction and magnetization reversal in a Gd/Co multilayer.

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Altering the interface morphology of rare-earth/transition metal (RE/TM) multilayers like Gd/Co through annealing significantly impacts their magnetic properties. This study reveals how interface engineering controls magnetic structure and magnetization reversal, crucial for applications like all-optical switching.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Rare-earth (RE)/transition metal (TM) heterostructures exhibit complex magnetic behaviors due to competing interfacial coupling and Zeeman energy.
  • Interface morphology in RE/TM systems offers a tunable parameter to engineer macroscopic magnetic responses by modifying microscopic interactions.

Purpose of the Study:

  • To investigate the influence of interface morphology on the structure and magnetic properties of Gd/Co multilayers.
  • To understand the magnetization reversal mechanisms across the compensation temperature (T_comp) in these engineered heterostructures.

Main Methods:

  • Controlled annealing of Gd/Co multilayer at 573 K under vacuum to tune interface morphology.
  • Combination of experimental techniques and one-dimensional spin-based model calculations.
  • Analysis of magnetic structure and magnetization reversal mechanisms.

Main Results:

  • Annealing-induced changes in interface morphology strongly influence the macroscopic magnetic properties of Gd/Co multilayers.
  • A strong interface-dependent coupling was observed, affecting the system's behavior across T_comp.
  • Formation of a helical magnetic structure with a 2π domain wall below T_comp was confirmed by calculations.

Conclusions:

  • Interface morphology is a critical factor in controlling the magnetic properties of RE/TM heterostructures.
  • The findings provide insights into the physics governing all-optical switching and related advanced magnetic applications.