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Atomic scale spin-dependent STM on magnetite using antiferromagnetic STM tips.

S Murphy¹, S F Ceballos, G Mariotto

¹SFI Nanoscience Laboratories, Physics Department, Trinity College, Dublin 2, Ireland. shmurphy@tcd.ie

Microscopy Research and Technique

|May 10, 2005

Summary

Scanning tunneling microscopy (STM) revealed distinct atomic structures on iron oxide (Fe3O4) surfaces. Antiferromagnetic tips identified charge ordering and oxygen vacancies, influenced by magnetic fields.

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Area of Science:

Materials Science
Surface Science
Condensed Matter Physics

Background:

Iron oxide (Fe3O4) is a technologically important material with complex surface properties.
Understanding the atomic structure of Fe3O4 surfaces is crucial for its applications.

Purpose of the Study:

To investigate the atomic structure of the (001) and (111) surfaces of Fe3O4 using Scanning Tunneling Microscopy (STM).
To explore the influence of charge ordering, oxygen vacancies, and external magnetic fields on these surfaces.

Main Methods:

Utilized STM with tips made from antiferromagnetic manganese-nickel (MnNi).
Examined the clean (001) and oxygen-terminated (111) surfaces of Fe3O4.
Applied an external magnetic field of 60 mT.

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Main Results:

The Fe3O4 (001) surface exhibits a superlattice indicative of charge ordering, distinguishing Fe(2+)-Fe2+ and Fe(3+)-Fe3+ dimers.
The Fe3O4 (111) surface shows a hexagonal superlattice with oxygen vacancies.
An external magnetic field induced changes in atomic corrugation around oxygen vacancies on the (111) surface.

Conclusions:

STM with antiferromagnetic tips provides detailed insights into Fe3O4 surface atomic structures.
Charge ordering and oxygen vacancies are key features of Fe3O4 surfaces.
Spin-polarized effects likely play a role in the observed magnetic field influence on surface defects.