Title:
THIN-FILM MAGNETIC MATERIAL AND METHOD FOR MAKING THE SAME
Document Type and Number:
WIPO Patent Application WO/1998/010442
Kind Code:
A1
Abstract:
The present invention relates to a thin-film magnetic material comprising an organic metal compound in the shape of a molecular layered structure of the Langmuir-film type. This film includes a number N$m(G)1 of ordered two-dimensional mono-layers of metal ions, wherein said metal ions are chosen from metals from the rare-earth group, preferably gadolinium. The minimum thickness of the thin-film material corresponds to that of one Langmuir mono-layer and is equal to 25 E when using stearic acid. The thickness of one mono-atomic magnetic layer of magnetic metal ions corresponds to the size of the metal atom used therein. The magnetic ordering of the material may be carried out in a wide range of temperatures, while said material exhibits highly stable magnetic characteristics and has a homogeneous structure. The method for producing this thin-film material comprises introducing into an aqueous phase weak and charged complexons, including monodentates such as acetate, as well as z-valence metal ions, provided that z$m(G)3. The ions together with the monodendate weak and charged complexons form neutral and low-charge complexes, whereby during the adsorption of multiple-charge metal cations said complexes prevent the formation of a surface electrical charge on the Langmuir monolayer as well as the formation of a volumic charge in the Langmuir-Blodgett films to be formed. A non-soluble mono-layer of amphiphilic molecules is formed at the separation limit of the air-water phase, wherein said mono-layer is compressed until its compressibility factor reaches a minimal value. Langmuir-Blodgett mono-layered or multi-layered films are further formed using conventional methods.
Inventors:
BOHR JAKOB (DK)
GUDOSHNIKOV SERGEI ALEXANDROVI (RU)
KOKSHAROV JURY ALEXEEVICH (RU)
SNIGIREV OLEG VASILIEVICH (RU)
TISHIN ALEXANDR METALLINOVICH (RU)
KHOMUTOV GENNADY BORISOVICH (RU)
GUDOSHNIKOV SERGEI ALEXANDROVI (RU)
KOKSHAROV JURY ALEXEEVICH (RU)
SNIGIREV OLEG VASILIEVICH (RU)
TISHIN ALEXANDR METALLINOVICH (RU)
KHOMUTOV GENNADY BORISOVICH (RU)
Application Number:
PCT/RU1997/000150
Publication Date:
March 12, 1998
Filing Date:
May 14, 1997
Export Citation:
Assignee:
AOZT TETRA (RU)
BOHR JAKOB (DK)
GUDOSHNIKOV SERGEI ALEXANDROVI (RU)
KOKSHAROV JURY ALEXEEVICH (RU)
SNIGIREV OLEG VASILIEVICH (RU)
TISHIN ALEXANDR METALLINOVICH (RU)
KHOMUTOV GENNADY BORISOVICH (RU)
BOHR JAKOB (DK)
GUDOSHNIKOV SERGEI ALEXANDROVI (RU)
KOKSHAROV JURY ALEXEEVICH (RU)
SNIGIREV OLEG VASILIEVICH (RU)
TISHIN ALEXANDR METALLINOVICH (RU)
KHOMUTOV GENNADY BORISOVICH (RU)
International Classes:
H01F10/10; B05D1/20; C07F1/08; H01F1/00; H01F10/00; H01F10/32; (IPC1-7): H01F10/10; H01F41/14
Domestic Patent References:
| WO1988006154A1 | 1988-08-25 |
Foreign References:
| SU1601644A1 | 1990-10-23 | |||
| US4330600A | 1982-05-18 | |||
| GB1384745A | 1975-02-19 | |||
| US3702263A | 1972-11-07 | |||
| US4659605A | 1987-04-21 | |||
| US3793066A | 1974-02-19 |
Attorney, Agent or Firm:
GOWLING, STRATHY & HENDERSON (3 Office 2, 4 Moscow, RU)
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