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

作者: S. Murphy , S.F. Ceballos , G. Mariotto , N. Berdunov , K. Jordan

DOI: 10.1002/JEMT.20148

关键词: OxygenMagnetic fieldSuperlatticeChemistryMagnetiteCondensed matter physicsAntiferromagnetismLayer (electronics)Spin (physics)Atomic units

摘要: STM tips made from antiferromagnetic MnNi have been used to investigate the atomic structure of (001) and (111) surfaces Fe3O4. The clean surface displays a (√2 × √2)R45° superlattice, which is attributed charge-ordering on surface, where Fe2+-Fe2+ Fe3+-Fe3+ dimers can be discriminated. oxygen-terminated characterized by hexagonal superlattice with periodicity 42 A. Oxygen vacancies are observed in atomically resolved images this superlattice. In presence an external magnetic field 60 mT, significant change corrugation topmost oxygen layer around each these defects observed. results both discussed terms possible spin-polarized effects. Microsc. Res. Tech. 66:85–92, 2005. © 2005 Wiley-Liss, Inc.

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