Abstract
Ferromagnetic FexGe1−x with x = 2%–9% are obtained by Fe deposition onto Ge(001) at high temperatures (500 °C). Low energy electron diffraction (LEED) investigation evidenced the preservation of the (1 × 1) surface structure of Ge(001) with Fe deposition. X-ray photoelectron spectroscopy (XPS) at Ge 3d and Fe 2p core levels evidenced strong Fe diffusion into the Ge substrate and formation of Ge-rich compounds, from FeGe3 to approximately FeGe2, depending on the amount of Fe deposited. Room temperature magneto-optical Kerr effect (MOKE) evidenced ferromagnetic ordering at room temperature, with about 0.1 Bohr magnetons per Fe atom, and also a clear uniaxial magnetic anisotropy with the in-plane [110] easy magnetization axis. This compound is a good candidate for promising applications in the field of semiconductor spintronics.
Highlights
Many efforts are concentrated nowadays on systems associating magnetic metals with semiconductors
The experiments are performed in a surface science complex setup (Specs) composed by a molecular beam epitaxy (MBE), a scanning tunneling microscopy (STM) and a photoelectron spectroscopy chamber
This paper presented the first evidence of a long range ordered interface
Summary
Many efforts are concentrated nowadays on systems associating magnetic metals with semiconductors. Materials 2013, 6 the other hand, diluted magnetic semiconductors where ferromagnetic ordering is intermediated by indirect exchange represent an exciting field in view of their possibilities of controlling ferromagnetism via external parameters, such as optically [2,3] or chemically Summarizing all this consistent work, efforts are dedicated nowadays to synthesize ferromagnetic metals deposited on semiconductors with intermixing and interface reaction as reduced as possible [1,4,5,6,7,8,9]; eventually, if the investigated system is proven to intermix despite efforts such as the use of passivating layers [4,5]. These layers are analyzed in situ by low energy electron diffraction (LEED) and by X-ray photoelectron spectroscopy (XPS), together with ex situ magneto-optical Kerr effect (MOKE) analyses
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