Laboratory for Spin-orbitronics

Scientific results:

The project is aimed at studying the mechanisms of influencing the spin structure and detecting the magnetic parameters of ferrimagnets through spin-polarized current and magnetotransport effects, generating spin waves in the sub- and terahertz ranges, developing concepts and nanosystems for creating prototypes of ferrimagnetic terahertz electronics devices (generators, logic devices, cells and data recording and storage environments, as well as neuromorphic computers). As a result, ferrimagnetic nanosystems were created, experimental measurements of SOT effects, interface and interlayer Dzyaloshinsky-Moriya interactions were carried out, and spin textures were studied to verify the theory. A theory has been developed that describes the universality of the relationship between the temperature of compensation of spin-orbit angular momentum, the temperature of compensation of magnetization and the Curie temperature of ferrimagnets. Theoretical models have been developed to describe generators of polarized spin waves based on ferrimagnets with extremely low attenuation coefficients. Prototypes of nanodevices based on the “heavy metal/ferrimagnet” structure for generating spin waves in the sub- and terahertz range with the ability to control polarization and attenuation have been developed and obtained. Prototypes of skyrmion generators have been created, and waveguides based on ferrimagnetic materials have been developed to move them. The concept of neuromorphic computers based on ferrimagnetic skyrmions operating in the subterahertz range, and skyrmion memory and logic devices has been developed. In particular, prototypes of a bistable ferrimagnetic SOT-MRAM memory cell (FIM SOT-MRAM), a skyrmion generator with a guide for their movement (FIM SOT), a skyrmion motion selector (Skyrmion-SOT), and a neuromorphic computer (logic element) have been developed.

Implementation of research results:

A new additional professional development program was developed and implemented by members of the scientific team of the laboratory “MICROMAGNETIC MODELING IN THE MUMAX3 SOFTWARE ENVIRONMENT”

Organizational and infrastructural changes:

New research equipment was purchased for a comprehensive study of thin magnetic films and nanostructures, vacuum deposition systems for obtaining samples were modernized, and the computing power of the supercomputer for micromagnetic modeling was increased.

Education and personnel occupational retraining:

Over three years, 12 members of the laboratory received bachelor's and master's degrees, and 9 people who were members of the laboratory's research team were accepted into graduate school. Members of the scientific team defended two candidate's theses and one doctoral dissertation.

Cooperation:

• Laboratory of Nano Spintronics, Division of Materials Chemistry, Institute for Chemical Research, Kyoto University

• Magnonics Laboratory N. G. Chernyshevskiy Saratov State University 

• Institute of Physics and Technology M. K. Ammosov North-Eastern Federal University