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Contract number
14.Z50.31.0025
Time span of the project
2014-2018
Head of the laboratory

As of 15.02.2021

29
Number of staff members
88
scientific publications
17
Objects of intellectual property
General information

Name of the project: Magnetic nanooptics devices with controllable loss and noise working at microwave frequencies

Strategy for Scientific and Technological Development Priority Level: а, д

Goals and objectives
Research directions:

  • The research of excitation, propagation and interaction of spin waves in magnetic micro- and nanostructures;
  • Magnetic nanostructures: technologies of synthesis, physical properties, and applications in spintronics;
  • Spin transport in electrically conducting magnetics and nanoheterostructures based on them;
  • Neutron and X-ray diagnostics of the nuclear and magnetic structure of planar nanosystems.

Project objectives:

  • The synthesis of multilayer nanomaterials using magnetron sputtering and molecular beam epitaxy methods;
  • The creation of laterally confined microobjects of arbitrary shape by optical and electron lithography;
  • The creation of prototypes of magnetic sensors;
  • The development of functional magnetically sensitive materials and magnetoelectronic devices in the interest of industrial enterprises;
  • The research of high-frequency optical properties of magnetic nanostructures;
  • The development of prototypes of spintronic devices for the transmission, generation, and detection of radio-frequency and microwave fields and signals;
  • The research of the structural and magnetic properties of multilayer nanostructures based on rare-earth and transition metals with the use of «‎mega-science» facilities at Russian and international research centres.
The practical value of the study

  • The Laboratory has implemented and studied magnetic nanooscillators powered by spin-polarised current or by pure spin current.
  • We have demonstrated the possibility of the efficient use of nanooscillators as spin wave sources for a wide range of magnonic devices relying on various physical phenomena (the spin Hall effect, the Slonchevsky effect and nonlocal spin accumulation) both in metallic and dielectric magnetics.
  • The Laboratory has demonstrated the possibility of the creation of ultrashort spin-wave packets produced by nanooscillators and propagating in nanodimensional magnetic waveguides.
  • We have achieved almost full compensation of attenuation of propagating spin waves via the spin Hall effect in magnetics. At the same time, the length of propagation of spin waves has been increased by 10 and more times.
  • Our researchers have experimentally and theoretically studied the magnetoelectric Seebeck effect in film structures based on yttrium iron garnet and graphene.
  • For the first time, we have observed magnonic second sound and wave transfer of energy and spin angular momentum in a quasi-equilibrium magnon gas undergoing Bose-Einstein condensation in a ferrite film at room temperature.
  • A method has been proposed to excite quasilinear and nonlinear auto-oscillation magnetisation modes by direct current in a nanoslot spin Hall nanooscillator. The method relies on a geometry with an extended gap.
  • Giant microwave magnetoresistance in [CoFe/Cu]n nanostructures in the millimetre wavelength range. We have produced record-high (up to 80 per cent) changes of the transfer ratio.
  • Our researchers have constructed a quantum theory of electron spin transport in conducting magnetics. The theory describes a whole array of new galvanomagnetic phenomena caused by the spin being influenced by forces created by spatially inhomogeneous external magnetic fields and (or) internal quantum fields of an exchange nature on conductivity electrons. We have provided a description of two new spin transport effects in conducting chiral helimagnetics, «the electric magneto-chiral Stern-Gerlach effect» and «the kinetic magneto-electric Stern-Gerlach effect». We have also determined the conditions in which resonance amplification of new effects that was called «magneto-chiral kinetic resonance» can be experimentally observed.
  • A spin valve that contains a dysprosium layer has been used as a tool for the study of the magnetic state in the dysprosium nanolayer when temperature decreases. Changes in the shape of magnetoresistance curves have been detected, which testifies to the transition of dysprosium into the helicoidal state as the temperature falls.
  • A correlation has been established between the features of the microstructure and the value of the magnetoresistance in [Co90Fe10/Cu]n superlattices with NiFeCr and Ta/NiFeCr buffer layers. A record-setting value of the magnetoresistance for this composition of superlattices has been achieved, equalling 83 per cant at room temperature.
  • Our researchers have synthesised spin valves containing a Ta/Ni48Fe12Cr40 layer, as well as the triple ferromagnetic alloy Co70Fe20Ni10 as a free layer. The produced spin valves exhibit zero shift of low-field hysteresis loop, a stong magnetoresistant effect and a magnetoresistive sensitivity of up to 18 per cent/Oe in the region of the magnetic field corresponding to remagnetisation of the free layer. On the basis of spin valve films, we have developed prototypes of magnetic sensors.
  • We have researched the magnetoresistance characteristics of Fe/Cr and Co90Fe10/Cu superlattices subjected to the impact of beams of accelerated Аr+ ions with an energy of 10 keV, the value of fluences F = 1013 – 1016 cm-2. It has been determined that at F ≤ 6·1014 cm-2, the investigated superlattices retain their functional characteristics.

Implemented results of research:

  • Our researchers have created unique samples of giant magnetic resonance-based multilayer nanostructures with optimised properties that are used for the development and production by «NPO Avtomatiki named after N. A. Semikhatov» and the Research and Production Complex «Technology centre» to manufacture high-sensitivity sensors of electromagnetic fields.
  • The Laboratory has conducted research, design, prototyping, and technological works in collaboration with the Ural Federal University.
  • We have developed [Co90Fe10/Cu]n nanostructures with a record-high magnetic resistivity of 83% at room temperature and exceeding 160% at helium temperatures. The developed approaches allow to produce film materials with a high magnetic resistivity effect and a linear change of magnetic resistance in the range of fields from 6 to 8 kOe. These magnetically sensitive materials pose interest in the creation of integrated sensors for the measurement of high currents in power supply lines.
  • Application No. 2020128123 for a Russian Federation patent for an invention «Multilayer wear- and corrosion-resistant coating on a steel substrate» has been registered.
  • Useful model «A nanooscillator excited by spin current», patent No. 189670.

Education and career development:

  • Annual All-Russian School and Seminar for Young Scientists in Condensed State Physics.
  • 2 doctoral dissertations, 6 candidate dissertations have been defended.
  • We have developed courses for Russian universities, particularly for the Ural Federal University.
  • On the grounds of the Laboratory, in 2021 students of the Ural Federal University will prepare 3 bachelor's degree theses.

Organizational and structural changes:

  • 8 rooms with aggregate square of 180 square meters have been allocated to the Laboratory.
  • We have introduced a device for Mandelstam-Brillouin scattering of light and a THz-spectrometer that became parts of the Shared Utilization Center of the M.N. Mikheev Institute of Metal Physics of the Ural Department of the RAS.
  • The Experimental Center for Nanotechnologies and Prospective Materials of the M.N. Mikheev Institute of Metal Physics of the Ural Department of the RAS has been equipped with modern devices including devices for synthesis of thin film structures, optical lithography, electronic transmission and scanning microscopy, a wide range of magnetic measurements, for X-ray structural analysis, mechanical tests, chemical analysis etc.

Other results:

Results of our work have on several occasions received awards of annual keynote sessions of the best achievements of the M.N. Mikheev Institute of Metal Physics of the Ural Department of the Russian Academy of Sciences.

Collaborations:

University of Münster (Germany), Saclay Nuclear Research Centre (France), University of California (USA), Max Planck Institute for Solid State Research (Germany), MIREA — Russian Technological University (Russia), Emory University (USA), Joint Institute for Nuclear Research (Russia): joint research, academic publications.

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demidov v.e., urazhdin s., divinskiy b., rinkevich a.b., demokritov s.o.
Nanoconstriction-based Spin-Hall nano-oscillator. Appl. Phys. Lett. 107: 202402 (2015)
demidov v.e., urazhdin s., liu r., divinskiy b., telegin a., demokritov s.o.
Excitation of Coherent Propagating Spin Waves by Pure Spin Currents. Nature Communications 7: 10446 (2016)
divinskiy b., demidov v.e., demokritov s.o., rinkevich a.b., urazhdin s.
Route toward High-Speed Nano-Magnonics Provided by Pure Spin Currents. Applied Physics Letters 109(25): 252401 (2016)
demidov v.e., urazhdin s., divinskiy b., bessonov v.d., rinkevich a.b., ustinov v.v., demokritov s.o.
Chemical potential of quasi-equilibrium magnon gas driven by pure spin current. Nature Communications 8(1): 1579 (2017)
divinskiy b., urazhdin s., demidov v.e., kozhanov a., nosov a.p., rinkevich a.b., demokritov s.o.
Magnetic Droplet Solitons Generated by Pure Spin Currents. Physical Review B 96: 224419 (2017)
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