Doctor of physics and mathematics, professor, academic supervisor of the infrastructural project “Development and application of amorphous ferromagnetic microwires for the creation of new sensors, composites and devices based thereon”
Condensed matter physics, magnetic phenomena, computer simulation.
Field of knowledge according to the OECD classifier
01.03.UK Physics, Condensed Matter.
2007 — present: IZMIRAN (Troitsk, Moscow), senior researcher.
2005: University of the Basque Country (Spain).
2001: doctor of physics and mathematics, Lomonosov Moscow State University.
1972: Faculty of Physics, Lomonosov Moscow State University.
Professor Usov and his colleagues are engaged in research on magnetic nanomaterials, which are used in modern nanotechnologies and biomedicine. The group demonstrated that the use of vortex micromagnetic states in magnetic nanoparticles is promising for efficient heat generation in an alternating magnetic field. This effect finds application in magnetic hyperthermia, a new method of cancer treatment.
For the same purposes, a detailed theory was developed that describes the behavior of assemblies of magnetic nanoparticles in a viscous liquid. The possibility of observing viscous and magnetic vibration modes of particles in an alternating magnetic field was pointed out. These vibrational modes have recently been discovered experimentally. In addition, the theoretical studies demonstrated that the magnetic-dipole interaction in dense assemblies of magnetic nanoparticles in most cases leads to a decrease in the specific absorbed power of the assembly. Some measures were proposed to reduce the influence of the magnetic-dipole interaction on the properties of the assembly.
A large cycle of theoretical and experimental studies was carried out to investigate the magnetoelastic properties of amorphous ferromagnetic microwires in a glass shell, which are used to create highly sensitive sensors of weak magnetic fields operating on the Giant Magnetic Impedance (GMI) effect. A technology was developed for precision etching of the glass sheath of the wire, which significantly improves the performance of the GMI sensor. A technology was also developed to create reliable electrical contacts to a metal microwire conductor. With the use of GMI sensors, measurements of magnetic fields of very weak corrosion currents were carried out, which appear during various types of corrosion of electrical steels. These works are aimed at creating an early diagnosis of the presence of corrosion in these materials.
The main activity of the group led by professor Usov in recent years include the following studies:
- Study of heterogeneous micromagnetic states in nanoparticles with sizes exceeding the single-domain diameter.
- Investigation of the magnetic, elastic and electrodynamic properties of amorphous ferromagnetic microwires and nanowires.
- Theoretical study of the effect of surface magnetic anisotropy on the properties of thin magnetic films, micro- and nanowires.
- Development of a detailed theory of the behavior of an assembly of superparamagnetic nanoparticles in a viscous liquid under the action of alternating and rotating magnetic fields.
- Study of the effect of strong magnetic-dipole interaction on the properties of dense assemblies of magnetic nanoparticles.
Scopus Hirsch Index — 23.
Number of articles on Scopus — 148.
Grant of the Ministry of Education and Science of the Russian Federation for the program to improve the competitiveness of NUST MISIS No. К2-2015-18, 07/01/2015 — 06/30/2017, supervisor.
Grant of the Ministry of Education and Science of the Russian Federation for the program to improve the competitiveness of NUST MISIS No. К2-2017-008, 07/01/2017 — 12/30/2018, supervisor.
Grant of the Ministry of Education and Science of the Russian Federation for the program to improve the competitiveness of NUST MISIS No. К2-2019-012, 03/07/2019 — 11/30/2020, supervisor.
- N.A. Usov and S.E. Peschany. Magnetization curling in a fine cylindrical particle. J. Magn. Magn. Mater. 118 (1993) pp. L290-L294.
- N.A. Usov, A.S. Antonov and A.N. Lagar’kov. Theory of giant magneto-impedance effect in amorphous wires with different types of magnetic anisotropy. J. Magn. Magn. Mater. 185 (1998) pp.
- N.A. Usov, Yu.B. Grebenshchikov, Hysteresis loops of an assembly of superparamagnetic nanoparticles with uniaxial anisotropy. J. Appl. Phys. 106 (2009) pp. 023917-1- 11.
- N.A. Usov, Low frequency hysteresis loops of superparamagnetic nanoparticles with uniaxial anisotropy. J. Appl. Phys. 107 (2010) pp. 123909-1- 12.
- N.A. Usov, B.Ya. Liubimov, Dynamics of magnetic nanoparticle in a viscous liquid: application to magnetic nanoparticle hyperthermia. J. Appl. Phys. 112 (2012) pp. 023901 —
- N.A. Usov, O.N. Serebryakova and V.P. Tarasov. Interaction effects in assembly of magnetic nanoparticles. Nanoscale Res. Lett. vol. 12, p. 489 (2017).
- N.A. Usov and O. N. Serebryakova, Influence of surface anisotropy on magnetization distribution in thin magnetic films, Journal of Applied Physics vol. 121, pp. 133905-1- 9 (2017);
- N.A. Usov, M. S. Nesmeyanov, V. P. Tarasov, Magnetic vortices as efficient nano heaters in magnetic nanoparticle hyperthermia. Scientific Reports, vol. 8, pp. 1224-1- 9, (2018). Impact factor 4.122, (Q1 Scopus, Q1 WoS)
- N.A. Usov, E. M. Gubanova. Application of magnetosomes in magnetic hyperthermia. Nanomaterials vol. 10 (2020) p. 1320.
- N.A. Usov, O. N. Serebryakova, Equilibrium properties of assembly of interacting superparamagnetic nanoparticles. Sci. Reports, vol. 10 (2020) p. 13677
S.A. Gudoshnikov, B.Ya. Lyubimov, N.A. Usov, A.P. Zhukov, M.P. Ipatov, Gonzalez H.M.G.E. “Device for measuring the characteristics of amorphous ferromagnetic microwires”, Patent for utility model of the Russian Federation No. 68713, 2007.
S.A. Gudoshnikov, B.Ya. Lyubimov, A.V. Popova, N.A. Usov “Method for the formation of a biocompatible polymer structure”, Patent for invention of the Russian Federation No. 2012128210, 2014.
IATE NRNU MEPhI, Condensed Matter Physics, annual course (2015 — 2021).
Member of the Lomonosov Moscow State University dissertation council.