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Manipulating surface magnetic order in iron telluride
Christopher Trainer1, Chi M Yim1, Christoph Heil2,3
1SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK.
Science Advances
|March 7, 2019
Summary
Researchers controlled surface magnetism in iron telluride, a key material for spintronics. By removing excess iron, they clarified its role in emergent magnetic orders and material properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Surface Science
Background:
- Emergent magnetic orders in correlated electron materials are crucial for spintronics.
- Understanding surface and interface effects on magnetism is vital for technological applications.
- Iron telluride, a parent compound of iron chalcogenide superconductors, displays complex magnetic behavior.
Purpose of the Study:
- To determine and manipulate the surface magnetic structure of iron telluride.
- To elucidate the influence of excess iron and lattice structure on emergent magnetic orders.
- To differentiate between itinerant electron-mediated and local moment interactions.
Main Methods:
- Low-temperature spin-polarized scanning tunneling microscopy (SP-STM).
- Controlled removal of surface excess iron.
- Analysis of surface magnetic structure and its dependence on composition.
Main Results:
- Demonstrated the ability to determine and manipulate surface magnetic structure in iron telluride.
- Showcased controlled removal of surface excess iron as a method to isolate its effects.
- Separated the influence of excess iron from lattice structure changes on magnetic orders.
Conclusions:
- Surface magnetism in iron telluride can be precisely controlled and analyzed.
- Excess iron plays a significant role in the emergent magnetic orders, distinct from lattice effects.
- This work provides insights into controlling magnetism at surfaces for spintronic applications.
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