The important aspects of nanomagnetism are the magnetic behavior of surface nanostructures containing d-element and the dependence of nano-scale surface interactions on nearest-neighbour environment. Within the program of fabrication surface nanostructures with prearranged properties we have fabricated and studied the metal-oxygen nanostructures on dispersed silica. These structures consisting on mono- and multilayers M-O groups on silica surface were obtained by molecular layering method. It was shown that the magnetic properties are determined by chemical design of nanostrucures (mono, multilayers, periodic and alternating multilayer of 3d and 4f element, for example, from Eu-O and Fe-O groups) as well as the composition of first deposited layer. In the case of iron-oxygen groups the creation of two-dimensional ferromagnetic ordering is possible [1]. In this report the results of experimental study of peculiarities of magnetic properties in periodic nanostructures containing Fe-R groups (CHCCH₂O- as R) on silica surfaces are represented. These nanostructures were obtained as a results of a set of alternating irreversible reactions between functional groups of silica, CHCCH₂OH and FeCl₃ in gaseous phase at 200C. As a sublayer we used SiO₂ + CHCCH₂OH. After deposition CHCCH₂OH on SiO₂ this nanostructure became ferromagnetic and by our opinion it can be useful for spintronic systems. The magnetic properties of surface nanostructures strongly depends on the number of deposited layer Fe⁺³-R, the effective magnetic moment therewith increase as the number of layer (1-4) from 2.36 to 7.56 MB corresponding at 293 K. The temperature dependence of μ_eff points to the antiferromagnetic character of surface interaction. Details on electron structure of these nanostructures will be discussed.
The work is supported by RFBR (grant N 03-02-32748).


[1]. EMRS Fall Meeting 2003, Book of abstr., P. 206

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1. Nanolevel Structuring - Design of Novel Functional Highly-Organized Solids and Materials