Cite this article as:

Hlopov B. V., Chucheva G. V., Mityagina A. B. Phase Changes of Multiferroic Magnetic Materials, Used in External Memory Systems. Izvestiya of Saratov University. New series. Series Physics, 2017, vol. 17, iss. 1, pp. 33-43. DOI: https://doi.org/10.18500/1817-3020-2017-17-1-33-43


UDC: 
621.318.12
Language: 
Russian

Phase Changes of Multiferroic Magnetic Materials, Used in External Memory Systems

Abstract

Background and Objectives: A review of studies on technological bases of multiferroic materials for their possible use in devices for the urgent destruction of information is presented. The analysis of characteristics of materials allows one to specify their phase changes caused by external influences and to investigate the magnetic properties. During the consideration of magnetic properties of thin films such material characteristics as the coercive force and saturation magnetization, and their dependence on the technology of deposition conditions (oxygen pressure, the deposition rate, temperature), the film thickness, the percentage composition of its constituent elements, heat treatment (annealing) and film microstructure, were studied. Materials and Methods: Analysis of multiferroic material properties in order to clarify the electrical characteristics and physical properties was conducted on the basis of iron-containing, cobalt-containing, barium-containing and rare earth transition metal alloys, that have helped to clarify the possibility and conditions of material phase transitions, their magnetic susceptibility to external magnetic and electromagnetic fields and to develop technological equipment for study of sample magnetic properties while subjecting by external electromagnetic fields. It is shown that phase transitions in multiferroic materials used in thinfilm samples are characterized by two types of allotropy, manifested in the presence of e-phase with a hexagonal dense packing structure and a-phase face-centered cubic structure. Their relationship and the transition between them depend on the purity, processing conditions and cooling rate. The paper discusses the properties of iron-containing, cobalt-containing, barium-containing, amorphous thin-film layers of the recording systems and magnetic properties of cobalt-chromium thin-film layers. Conclusion: Analysis of the results allows one to make a conclusion about the possibility of creating equipment with a magnetic-controlled system for the creation of magnetic fields, the intensity of which exceeds the value of the coercive force of multiferroic materials used in existing data carriers. Experimental confirmation of phase transitions in the presented materials is a prerequisite for the development of devices for the urgent destruction of information from electronic data carriers.

References

1. Hlopov B. V., Mityagin A. Yu., Fesenko M. V., Kuz’minyh A. S. Malogabaritnoe ustroystvo hraneniya magnitnyh nositeley informatcii [Compact storage of magnetic media]. Mezhdunarodnaya konf. «Materialy s osobymi fi zicheskimi svojstvami i magnitnye sistemy»: sbornik trudov [International conference «Materials with special physical properties and magnetic systems»: proceedings]. Moscow, OOO CP «Vozrojdenie», 2007, pp. 305–310 (in Russian).

2. Mityagin A. Yu, Hlopov B. V. Svoystva magnitnyh materialov, primenyaemyh v sistemah vneshney pamyati EVM [Properties of magnetic materials used in the systems of external ECM memory]. Mezhdunar. nauch.- tehnicheskaya konf. «Informatcionnye tehnologii v nauke, tehnike i obrazovanii»: trudy [International scientifi c-technical conference «Information technologies in science, engineering and education»: proceedings]. Moscow, Nauchtehlitizdat, 2005, vol. 1, pp. 127–133 (in Russian).

3. Hlopov B. V., Mityagin A. Yu., Roman’kov A. S. Development of Normative Documents, the Selection of Promising Tools for Creation and Application of Technology to the Design, Development and Production of Information and Software, Information Technology and the Automated Military Systems that Meet the Requirements on Information Security. Pervoput-D1, 2000, vol. 1, pp. 1–137 (in Russian).

4. Ohnuma S., Kunimoto А., Masumoto Т. The infl uence of deposition conditions on the magnetic properties in PtMnSb fi lms. IEEE Transactions on Magnetics, 1988, vol. 24, iss. 6, pp. 2551–2553.

5. Mityagin A. Yu., Shpak A. V., Hlopov B. V., Lobanov B. S. The necessary conditions for the design of devices secure destruction of information with a modern HDD. Nanoinjeneriya [Nanoengineering], 2012, no. 9 (15), pp. 12–20 (in Russian).

6. Hlopov B. V. // Equipment to change the magnetic state of the thin-fi lm layer of magnetic media. T-Komm: Telekommunikatcii i transport [T-Comm: Telecommunications and transport], 2012, vol. 6, no. 3, pp. 56–60 (in Russian).

7. Tomashpol’skij Yu. Ja., Skorikov V. M., Venevcov Yu. N., Speranskaja E. I. About farming and some structural studies of single crystals of BiFeO3 magnetokinetic. Izvestija AN SSSR [Izvestiya USSR Academy of Sciences], 1966, vol. 2, no. 10, pp. 707–711 (in Russian).

8. Malinina R. I., Shubakov V. S. Struktura bistro zakalennyh splavov na osnove sistemy Fe–Cr–Co [The structure of rapidly quenched alloys based on Fe–Cr–Co]. Mejdunarodnay konferenciia po postojannym magnitam: sbornik tezisov [International conference on permanent magnets: abstracts]. Moscow, OOO CP «Vozrojdenie», 2005, pp. 66 (in Russian).

9. Kuz’minyh A. S., Mityagin A. Yu., Fesenko M. V., Hlopov B. V. Avtomatizirovannaja vstroennaja sistema kontrolja stiranija magnitnoj zapisi [The automated control system of the erasing magnetic recording]. Mejdunarodnay konferenciia po postojannym magnitam: sbornik tezisov [International conference on permanent magnets: abstracts]. Moscow, OOO CP «Vozrojdenie», 2007, pp. 190–191 (in Russian).

10. Guljaev Yu. V., Hlopov B. V., Lobanov B. S., Mityagin A. Yu., Sokolovskij A. A., Timiryazeva M. P., Fesenko M. V. The Infl uence of External Magnetic Fields on the Information Structure of Modern Hard Disks. Nanomikrosistemnaja tehnika [Nano-microsystem techn.], 2010, no. 11, pp. 10–14 (in Russian).

11. Guljaev Yu. V., Hlopov B. V., Zhitkovskij V. D., Kazancev G. V., Mityagin A. Yu., Murav’ev E. N., Roman’kov A. S., Sokolovskij A. A. The Destruction of Information on Hard Magnetic Disks. Inzhenernaja fi zika [Engineering physics], 2004, no. 2, pp. 2–12 (in Russian).

12. Kravchenko I. S., Hlopov B. V., Fesenko M. V., Kuz’minyh A. S. The External Magnetic Field for the Rapid Destruction of Information on Magnetic Media. Perspektivnye materialy [Perspective materials], 2008, special issue, pp. 299–300 (in Russian).

13. Perminov A. S., Cherednichencko I. V., Sumin V. I. O mehanizmah peremagnichivaniya v splavah Fe-34% Cr-Co3%MoC15 и 18% Cobalt pri temperaturah izotermicheskoy termagnitnoy obrabotki [On the mechanisms of magnetization reversal in the alloys Fe-34% Cr-Co3%MoC15 and 18% of Cobalt at temperatures of isothermal termanini processing]. Mejdunarodnaya konferenciia po postojannym magnitam: sbornik tezisov [International conference on permanent magnets: abstracts]. Moscow, OOO CP «Vozrojdenie», 2005, pp. 68 (in Russian).

14. Homma T., Inoue K., Asai H., Ohrui K., Osaka T., Yarnazaki Y., Namikawa T. Magnetic Properties and Microstructure of Electroless-Plated CoNiP Perpendicular Magnetic Recording Media. Journal of the Magnetics Society of Japan, 1991, vol. 15, no. 2, pp. 113–116.

15. Maeda J., Takahashi M. Segregated microstructure growth in sputtered Co-Cr fi lms. IEEE Transactions on Magnetics, 1988, vol. 24, iss. 6, pp. 3012–3014.

16. Popova O. I. Nefedov V. S., Glebov V. A. Ekspressmetodika otcenki fazostrukturnoy odnorodnosti magnitnyh poroshkov neodim-zhelezo-bor [A rapid method for evaluation photostructural homogeneity of the magnetic powders of neodymium-iron-boron]. Mejdunarodnay konferenciia po postojannym magnitam: sbornik tezisov [International conference on permanent magnets: abstracts]. Moscow, OOO CP «Vozrojdenie», 2005, pp. 138 (in Russian).

17. Haines W. VSM profi ling of CoCr fi lms: A new analytical technique. IEEE Transactions on Magnetics, 1984, vol. 20, iss. 5, pp. 812–814.

18. Fesenko M. V., Hlopov B. V., Krutov M. M., Kuzmin A. S. The infl uence of external magnetic fi elds on the thin-film layers of magnetic media. Gornyj informatcionno-analiticheskij bulleten (nauchnotehnicheskij zhurnal) [Mining information-analytical Bulletin (scientific and technical journal)], 2007, vol. 12, no. 12, pp. 314–316 (in Russian).

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