Thickness-dependent electronic and magnetic properties of gamma '-Fe4N atomic layers on Cu(001)

Article

关键词: RAY CIRCULAR-DICHROISM;    FE FILMS;    FE16N2 FILMS;    IRON FILMS;    AB-INITIO;    TRANSITION;    SURFACE;    GROWTH;    SPIN;    NI;   

DOI  :  10.1103/PhysRevB.95.224417

来源: SCIE

【 摘 要 】

Growth, electronic, and magnetic properties of gamma'-Fe4N atomic layers on Cu(001) are studied by scanning tunnelingmicroscopy/spectroscopy and x-ray absorption spectroscopy/magnetic circular dichroism. Acontinuous film of ordered trilayer gamma'-Fe4N is obtained by Fe deposition under N-2 atmosphere onto monolayer Fe2N/Cu(001), while the repetition of a bombardment with 0.5 keV N+ ions during growth cycles results in imperfect bilayer gamma'-Fe4N. The increase in the sample thickness causes the change in the surface electronic structure, as well as the enhancement in the spin magnetic moment of Fe atoms reaching similar to 1.4 mu(B)/atom in the trilayer sample. The observed thickness-dependent properties of the system are well interpreted by the layer-resolved density of states calculated using first principles, which demonstrates the strongly layer dependent electronic states within each surface, subsurface, and interfacial plane of the gamma'-Fe4N atomic layers on Cu(001).

【 授权许可】

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