Institute of Magnetism

NAS of Ukraine and MES of Ukraine

 

Department 02 - Physics of Fims

Department 02 - Physics of Films

 

 Researsh Directions:

Multilayer structures with thermo-induced switching of magnetic configuration

Incorporation of thermo-sensitive components into magnetic nanostructures is one of the promising ways towards broadening the functionality of spintronic devices and improvement of their performance. This approach implies the use of internal heating (due to electrical-current Joule loss) or local external action (e.g. by laser pulse) to control a magnetic state and electrical resistivity of nanoobjects. The aim of our investigations is design and implementation of new principles for thermo-magnetic and thermo-electric manipulation of magnetic state, interlayer coupling and electrical resistivity in complex magnetic nanosystems.

Single- and multicomponent (composite) nanostructures with multiferroic properties

 

Multiferroics refer to the materials that simultaneously display two or more ferroic orders such as ferroelectricity, (anti-)ferromagnetism, and ferroelasticity. A strong coupling between multiple ferroic orders can produce additional functionalities, such as magnetoelectric effect, which allows control of electric polarization by magnetic field, or vice versa, the control of magnetization by electric field. Researchers of the Department are involved in the investigation of strain-mediated magnetoelectric effect in thin-film and nanoscaled complex-oxide heterostructures.

Magnetic nanoparticles for biomedical applications

Important implementation of magnetic nanoparticles in medicine is magnetic hyperthermia therapy which involves heat generation using magnetic nanoparticles in response to alternating magnetic field. To this end, the nanoparticles have to satisfy some specific requirements concerning both their inherent parameters (magnetic anisotropy, magnetization), as well as morphological characteristics (size, size distribution). The research in this direction is aimed at development of new approaches to optimization of nanomagnet parameters and design of novel ways for reliable control of their magnetic and thermal properties. The work is being carried on in close collaboration with the research groups from V.I. Vernadsky Institute of General and Inorganic Chemistry, and Institute of Physics.

Magnetic interactions and dissipation processes in nanostructured and composite materials

Engineering of high-speed spintronic devices and microwave electronic elements requires comprehensive understanding of the origin and sources of energy loss in complex magnetic systems. The researchers of the Department investigate mechanisms of magnetization dissipation in thin-film multilayers, systems with (synthetic) antiferromagnetic components, nanostructured composite materials. Particular emphasis is being made on novel effects, which are not inherent in bulk systems: various types of magnetic interactions at nanoscale, generation and dissipation of spin currents, etc. In-depth analysis of such effects will allow the optimization of operation speed and quality factors for a variety of applications in spintronics and microwave electronics.


Selected publications:

  1. D. M. Polishchuk et al. Thermally induced antiferromagnetic exchange in magnetic multilayers. Phys. Rev. B 96, 104427 (2017).
  2. Yu. Shlapa et al. Iron-doped (La,Sr)MnO3 manganites as promising mediators of self-controlled magnetic nanohyperthermia. Nanoscale Res. Lett. 11, 24 (2016).
  3. A. F. Kravets et al. Synthetic ferrimagnets with thermomagnetic switching. Phys. Rev. B 90, 104427 (2014).
  4. X. Moya et al. Giant and reversible extrinsic magnetocaloric effects in La0.7Ca0.3MnO3 films due to strain. Nature Mater. 12, 52 (2013).
  5. S. M. Ryabchenko et al. Rotatable magnetic anisotropy in Si/SiO2/(Co2Fe)xGe1−x Heusler alloy films. J. Phys.: Cond. Matter.25, 416003 (2013).
  6. A. F. Kravets et al. Temperature-controlled interlayer exchange coupling in strong/weak ferromagnetic multilayers: A thermomagnetic Curie switch. Phys. Rev. B 86, 214413 (2012).
  7. A. I. Tovstolytkin et al. Complex phase separation in La0.6Ca0.4MnO3 films revealed by electron spin resonance. Phys. Rev. B 83, 184404 (2011).
  8. V. G. Kravets et al. Plasmonic blackbody: Strong absorption of light by metal nanoparticles embedded in a dielectric matrix. Phys. Rev. B 81, 165401 (2010).

 Awards:

  • 2017 – Prof. A.M. Pogorily was honored with the Award of the NAS of Ukraine “For promotion of young scientists”.
  • 2016 – PhDs I.M. Kozak and A.O. Kosogor were awarded the Prize of the Supreme Council of Ukraine for the most talented young scientists in the field of fundamental and applied researches and scientific developments for the work “Magnetic and structural properties of functional materials in the vicinity of phase transitions”.
  • 2016 – Prof. A.I. Tovstolytkin was honored with the Certificate of Outstanding Contribution in Reviewing from Journal of Alloys and Compounds (Elsevier, Amsterdam, The Netherlands).
  • 2014 – PhDs T.I. Polek and D.M. Polishchuk were awarded the Prize of the President of Ukraine for young scientists for the work “Materials with colossal magnetoresistance: transformation of magnetic state induced by chemical substitutions and scaling factors”
  • 2013 – Profs. A.M. Pogorily (Institute of Magnetism), S.I. Tarapov (O.Ya. Usikov Institute of Radiophysics and Electronics) and D.P. Belozorov (Institute for Theoretical Physics NSC “Kharkov Institute of Physics and Technology”) were awarded S.Ya. Braude Prize of the NAS of Ukraine for the outstanding scientific works in radiophysics and radioastronomy.
  • 2008 – Profs. A.M. Pogorily, V.F. Los and Ya. Bazaliy were awarded I. Pului Prize of the NAS of Ukraine for the outstanding scientific works in applied physics.

History of department:

Department of Physics of Films was one of the three departments, which had formed the foundation for establishing Institute of Magnetism in 1995.
The history of Department starts from 1962. This year the Laboratory of Physics of Films, which was a part of Department of Technology of Alloys in Institute of Metal Physics (at present – G. V. Kurdyumov Institute of Metal Physics of the NAS of Ukraine), had been transformed into Department of Physics of Films. The first head of the Department was Prof. A. G. Lisnyk. In 1984 Prof. A.M. Pogorily become a new head of the transformed Department. Since 2016, the Department is headed by Prof. A.I. Tovstolytkin.

 

Department news


2018-01-30
Joint team of authors from Institute of Magnetism (Kyiv, Ukraine), B. Verkin Institute for Low Temperature Physics and Engineering (Kharkiv, Ukraine) and Royal Institute of Technology (Stockholm, Sweden) reported experimental demonstration of thermoelectric control of magnetic and resistive states in magnetic tunnel junctions (Appl. Phys. Lett. 111, 262401 (2017)). The switching between resistive states was shown in the temperature interval slightly above room temperature, implying its importance for the development of brand-new spin-electronic applications.


2017-09-19
Implementation of magnetic nanoparticles in medical technologies encounters substantial difficulties when experimenting with living organisms. Joint efforts of scientists from Institute of Magnetism, Institute of Physics and V.I. Vernadsky Institute of General and Inorganic Chemistry have resulted in the development of the method for realistic modelling of the behavior of ensembles of magnetic nanoparticles in alternating magnetic fields of varied frequencies and amplitudes. The method allows one to minimize a total number of experiments, defines contributions from nanoparticles of different sizes and shows the ways for optimization of their parameters (Phys. Chem. Chem. Phys. 19, 27015 (2017)). The validity of the approach was demonstrated for nanoparticles (La,Sr)MnO3, which are promising heat inductors for magnetic nano-hyperthermia.

©2019 Institute of Magnetism NAS of Ukraine and MES of Ukraine. 03142, 36-b Akad. Vernadskogo blvd., Kyiv, Ukraine

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