Search academic texts

Information × Registration Number 0226U001046, (0123U104827) , R & D reports Title Hybrid nanostructures based on ferromagnets, antiferromagnets and superconductors with controlled exchange interaction for the latest spintronics and magnonics popup.stage_title Дослідження багатошарових гібридних наноструктур надпровідник- феромагнетик-надпровідник Head Dzhezheria Yurii I., Доктор фізико-математичних наукKravets Anatolii F., Доктор фізико-математичних наук Registration Date 20-01-2026 Organization Institute of Magnetism NAS of Ukraine and MES of Ukraine popup.description1 The purpose of research within the project is to clarify the nature of the superconducting effect of proximity at the interface between a ferromagnet and a superconductor and at the interface between an antiferromagnet and a superconductor and to assess the contribution of this effect to the formation of magnetic ordering and the abrupt change in the magnitude of magnetic anisotropy in multilayer nanostructures. popup.description2 The resonant regime of barrier-free switching of synthetic antiferromagnets (SAF) has been revealed and analyzed, in which a short and low-amplitude magnetic field pulse applied perpendicular to the structure plane is sufficient to invert the magnetic state. It was shown that during synchronous (acoustic) rotation of two ferromagnetic layers, the total moment remains zero, which practically eliminates the magnetostatic barrier and makes the switching ultra-fast and practically inertia-free. It was proven that the proposed barrier-free switching mechanism requires significantly lower fields than when switching a single ferromagnetic layer, and can be implemented both by means of optical pulses (through a laser-induced normal magnetic field) and by means of spin transfer moments in tunnel structures. The barrier-free switching mode opens up the possibility of significantly reducing energy consumption and increasing the speed of SAF elements in promising high-speed MRAM devices, while also ensuring high thermal stability of magnetic states. Magnon transport in YIG–GGG heterostructures was studied in the temperature range 293 K–26 mK. It was established that at cryogenic temperatures, magnetic losses become strongly dependent on the wave number, which is due to the dipole interaction of the YIG film with the partially magnetized GGG substrate. The results obtained are important for the development of low-dissipative magnon components in quantum hybrid systems. It has been established that the sharp increase in the FMR line width in YIG films in the ultra-low temperature range (up to tens of millikelvin) is mainly due to the inhomogeneous magnetic field induced by the partially magnetized paramagnetic GGG substrate. It was shown that the contribution of this field can increase the line width by up to ~6.7 times. The results obtained are important for optimizing magnon structures and determining ways to minimize parasitic line broadening for quantum applications. Product Description popup.authors Igor V. Gerasimchuk Yurii B. Skyrta Volodymyr O. Golub Denys V. Slobodianiuk Serhii V. Cherepov Yulia I. Kharlan Halyna M. Nefedova Roman V. Verba Viktor M. Kalyta Pavlo Y. Polynchuk popup.nrat_date 2026-01-20 Close