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Contract number
Time span of the project
Invited researcher
2021 - 2022 Ono Teruo

As of 01.11.2022

Number of staff members
scientific publications
General information

The development of big data processing and decision-making technologies, including artificial intelligence systems, requires a highly productive and energy efficient component base. One of the directions of the development of modern electronics is spintronics and spin-orbitronics, where the electron spin is manipulated instead of the charge. In recent years, research indicates that ferrimagnetics possess a higher potential for the solution of these problems than ferromagnetics. A small value of the resultant magnetic moment gives a number of advantages: stability and the minimal size of spin textures, a high operating speed and a high energy efficiency.

Name of the project: Ferrimagnetic spin-orbitronics

Goals and objectives

The main goal of the scientific survey is the search for fundamental mechanisms of the control of the spin texture and the magnetic parameters of ferrimagnetics via spin-orbital effects for the formation of scientific and technological foundations of a new generation of intelligent electronics and the creation of heterostructures with ferrimagnetics for energy-efficient data storage devices, spintronic logic devices, and neuromorphic computers operating in the terahertz range. The found solutions will reduce the energy consumption of storage systems by two orders of magnitude (to several fJ/bit) and increase the data processing rate by three orders of magnitude, which meets the requirements for future electronic big data processing and artificial intelligence systems.

The practical value of the study

Scientific results:

As a result of our work we obtained new knowledge in spin-orbitronics that will allow to develop new spintronic devices based on ferromagnetics that will possess better properties  and characteristics that devices based on ferro- and antiferromagnetics.

In the course of the implementation of the project we conducted a research of magnetic transport properties of the prospective ferromagnetic stricture W/CoTb/Ru and observed a number of significant fundamental and applied results. We demonstrate that by changing the thickness of the CoTb ferromagnetic layer it is possible to switch between saturation states while maintaining a fixed composition. It was determined that the maximum efficiency of current-induced   impact is observed in the vicinity of the compensation state, which can be achieved by changing the composition or thickness. However, the minimum switching current corresponds to the case of the minimum thickness of the ferromagnetic layer and the minimum Co content in it, which is related to the Joule heating effect. We assessed the distribution of current in the layers of the structure. The minimum observed density of state switching current is 2,5·1010 A/m2, which is one of the lowest earlier observed values. The maximum observed speed of movement of the domain wall under the influence of current was 10 μm/s.

Education and career development:

Within the project, weekly online seminars are conducted under the supervision of Profesor Teruo Ono, in which we discuss the achieved results, correct the research plan, undergraduate and postgraduate students present their results, leading scientists, including foreign, present overview lectures on spin-orbitronics.


  • N. G. Chernyshevskiy Saratov State University (Russia): joint research of with the use of Mandelstam-Brillouin spectroscopy
  • Laboratory of Nano Spintronics, Division of Materials Chemistry, Institute for Chemical Research, Kyoto University (Japan):  joint research and publications.

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hideki narita, ryo kawarazaki, daisuke kan, yoichi shiota, takahiro moriyama, y. shimakawa, alexey v. ognev, alexander s. samardak, and teruo ono.
Field-free superconducting diode effect in noncentrosymmetric superconductor/ferromagnet multilayers // Nature Nanotechnology, 2022, август (17, 8).
junho park, taehyun kim, gyu won kim, vladimir bessonov, andrey telegin, ilia g. iliushin, anastasiia a. pervishko, dmitry yudin, aleksei yu. samardak, alexey v. ognev, alexander s. samardak, jiung cho, young keun kim.
Compositional gradient induced enhancement of Dzyaloshinskii–Moriya interaction in Pt/Co/Ta heterostructures modulated by Pt–Co alloy intralayers // Acta Materialia, 2022, декабрь (241).
yoichi shiota, ryusuke hisatomi, takahiro moriyama, alexander s samardak, teruo ono
Inhomogeneous magnetic properties characterized by simultaneous electrical and optical detection of spin-torque ferromagnetic resonance // Applied Physics Letters, 2021, ноябрь (119, 19).
w. l. yang, z. r. yan, y. w. xing, c. cheng, c. y. guo, x. m. luo, m. k. zhao, g. q. yu, c. h. wan, m. e. stebliy, a. v. ognev, a. s. samardak, and x. f. han,
Role of an in-plane Ferromagnet in a T-type Structure for Field-Free Magnetization Switching // Applied Physics Letters, 2022, март (120, 12).
a.s. samardak, a.v. ognev, a.g. kolesnikov, m.e. stebliy, v.yu. samardak, i.g. iliushin, a.a. pervishko, d. yudin, m. platunov, t. ono, f. wilhelm, andrey rogalev
XMCD and ab-initio study of interface-engineered ultrathin Ru/Co/W/Ru films with perpendicular magnetic anisotropy and strong Dzyaloshinskii-Moriya interaction // Physical Chemistry Chemical Physics, 2022, март (24, 14).
yoichi shiota, kaoru noda, yuushou hirata, kyosuke kuwano, shinsaku funada, ryusuke hisatomi, takahiro moriyama, maksim stebliy, alexey v. ognev, alexander s. samardak and teruo ono
Temperature dependence of domain wall creep motion in ferrimagnetic Tb/CoFeB/MgO microwires // Journal of Magnetism and Magnetic Materials, 2022, июль (553).
samardak, a.s., kolesnikov, a.g., davydenko, a.v. m.e. stebliy, a.v. ognev
Topologically Nontrivial Spin Textures in Thin Magnetic Films. Physics of Metals and Metallography, 2022, март, 123, 3.
samardak a. yu., jeon y. s., kozlov a. g., rogachev k. a., ognev a. v., jeong e., kim g. w., ko m. j., samardak a. s., kim y. k.
Inter-wire and Intra-wire Magnetostatic Interactions in Fe-Au Barcode Nanowires with Alternating Ferromagnetically Strong and Weak Segments. // Small, 2022.
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