期刊
PHYSICAL REVIEW B
卷 87, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.195410
关键词
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资金
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001058]
- Austrian Science Fund [P24925-N20]
- German Science Foundation [SFB/TR80]
- Austrian Science Fund (FWF) [P 24925] Funding Source: researchfish
- Austrian Science Fund (FWF) [P24925] Funding Source: Austrian Science Fund (FWF)
Reduced terminations of the Fe3O4(001) surface were studied using scanning tunneling microscopy, x-ray photoelectron spectroscopy (XPS), and density functional theory (DFT). Fe atoms, deposited onto the thermodynamically stable, distorted B-layer termination at room temperature (RT), occupy one of two available tetrahedrally coordinated sites per (root 2 x root 2)R45 degrees. unit cell. Further RT deposition results in Fe clusters. With mild annealing, a second Fe adatom per unit cell is accommodated, though not in the second tetrahedral site. Rather both Fe atoms reside in octahedral coordinated sites, leading to a Fe-dimer termination. At four additional Fe atoms per unit cell, all surface octahedral sites are occupied, resulting in a FeO(001)-like phase. The observed configurations are consistent with the calculated surface phase diagram. Both XPS and DFT+U results indicate a progressive reduction of surface iron from Fe3+ to Fe2+ upon Fe deposition. The antiferromagnetic FeO layer on top of ferromagnetic Fe3O4(001) suggests possible exchange bias in this system.
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