Room Temperature Ferromagnetic, Anisotropic, Germanium Rich FeGe(001) Alloys

Materials

George A. Lungu¹  Nicoleta G. Apostol¹  Laura E. Stoflea¹  Ruxandra M. Costescu¹  Dana G. Popescu¹ 

[1] National Institute of Materials Physics, Atomistilor 105b, P.O. Box MG-7, Magurele-Ilfov 077125, Romania;

关键词: metal-semiconductor compounds;    spintronics;    surface magnetism;    molecular beam epitaxy;    X-ray photoelectron spectroscopy;    magneto-optical Kerr effect;   

DOI  :  10.3390/ma6020612

来源: mdpi

【 摘 要 】

Ferromagnetic Fe_xGe_1−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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.