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Development of physical principles of the creation of new spintronic elements on the base of metal-oxide compounds

Characteristic property of magnetic-field controlled sensor on the base of multilayer structures is based on the phenomenon of spin polarization of conduction electrons.

differences between traditional electronics and spintronics


Development of magnetically operated sensors based on nanoscale granular structures and multilayer structures

Obtaining of thin films Sr2FeMoO6-δ
SFMO films and multilayer structures based on the methods of ion-beam and magnetron sputtering.

installation of ion-beam and magnetron sputtering


Preparation of high-temperature superconducting materials (HTSC)

Experimental parameters:

  • Temperature range 2-300 K
  • Magnetic field induction – up to 14 T
  • Electrical current – up to 250 A
  • Measurements of temperature dependences of  electrical resistance for the determination of transition temperature Tc
  • Measurements of  current dependences of electrical resistance at T=78 К for a determination of jc
  • R(B) at T=78K for a determination of Вс
  • Construction of the triple diagram of critical parameters Tc, jc and Bc
  • Measurements of thermophysical properties of HTSC (heat conduction λ, heat capacity cp)
  • Measurements of thermoelectric power in the temperature range 4-300 K
  • Measurements of the Hall effect in magnetic fields up to 14 T


The processes of cation substitution and oxygen exchange in metal with the structure of the double perovskite

Superstructural ordering of Fe3+ and Mo5+ cations in Sr2FeMoO6-δ

The SFMO sample was synthesized from a stoichiometric mixture: (a) MoO3, Fe2O3 and SrCO3 simple oxides, and (b) SrFeO3-х and SrMoO4 precursors.

The use of partially reduced precursors promotes the increase of the rate of SFMO growth in the sample No. 2. The temperature of synthesis lowers as well.  Superstructural ordering of Fe3+ and Mo5+ cations is created. Besides, according to the XRD analysis data, additional (101) and (103) reflexes were determined.


Methods of their synthesis, processes of cation substitution and cation exchange in metal-oxide compounds with a double perovskite structure

Synthesis of Sr2FeMoO6-δ

The synthesis of the Sr2FeMoO6-δ ( (SFMO) is carried out from the basic reagents SrCO3, Fe2O3, MoO3 in the following way:

  1. mixing the initial powder reagents in a stoichiometric ratio
  2. pressing of the powder
  3. preliminary annealing
  4. grinding
  5. pressing of the powder
  6. final annealing
  7. obtaining a predetermined oxygen index of SFMO.


Influence of nonstoichiometry defects on magnetic and electric transport properties of high-temperature superconductors

Zero-dimensional  deficiency in Sr2FeMoO6-δ structure

One can see from experimental results that magnetic moments of the double perovskite are lower than the theoretically calculated ones. This discrepancy can be explained by the formation of antisite point defects, such as [Fe]Mo, [Mo]Fe or of oxygen vacancies (V0).


Spin-dependent transport of electrons in an external magnetic field

Magnetic structure of Sr2FeMoO6-δ

The total spin S=2 consist of spins S(Fe3+) = 5/2 and S(Mo5+) = -1/2. Eectronic spins Fe3+ and Mo5+ are placed in Fe/Mo ferrimagnetic plates, which are intercrossed at the angle 120o. Due to the non-parallel arrangement of spins in the crystal lattice a ferrimagnetic structure is formed.


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