期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 329, 期 -, 页码 95-100出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2012.10.010
关键词
Magnetism of nanostructures; Magnetic measurements; Scanning tunneling microscopy; Surface structure
We conducted a structural and magnetic analysis of ultrathin Fe films on Rh (001) surfaces by using low electron energy diffraction (LEED), magneto-optical Kerr effects (MOKE) and spin-polarized scanning tunneling microscopy (SP-STM). The films in the investigated thickness range up to 6 monolayers (ML) are pseudomorphic to the Rh (001) substrate. While Fe films thinner than 3 ML grow layer-by-layer at room temperature (RT), Fe films thicker than 4 ML form islands. 1 ML Fe films do not show any hysteresis loops even at low temperature. Polar hysteresis loops for the 2 ML and 3 ML thick films appear at low temperatures. When 1 ML thick Fe films were studied by Cr- and Fe-coated W tips, a (2 x 3) and stripe structures were observed, respectively. The structures originate from a complex magnetic structure of 1 ML Fe. Based on the SP-STM results we propose a spin configuration model of a 1 ML Fe film. (C) 2012 Elsevier B.V. All rights reserved.
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