Registration Number
0225U000225,
(0124U000392)
, R & D reports
Title
Resonant interaction and amplification of magnetocaloric, magnetoelectric and magnetoacoustic effects in composite materials and piezoelectric-magnetics structures
popup.stage_title
Дослідження шляхів підсилення магнітокалоричних та невзаємних магнітоакустичних ефектів
Head
Lvov Victor A., Доктор фізико-математичних наук
Registration Date
07-01-2025
Organization
Institute of Magnetism NAS of Ukraine and MES of Ukraine
popup.description1
Establishment of physical laws of resonant linear and nonlinear interaction between magnetic and elastic subsystems (magnon-phonon interaction) in composite magnetoelastic materials and heterostructures, and development of methods for enhancing magnetocaloric, magnetoelectric, nonreciprocal and nonlinear magnetoacoustic effects in them
popup.description2
The possibility of observation of a giant magnetocaloric effect in the case when a ferromagnet exhibits a ferroelectric-type phase transition is revealed. The concentration phase diagram of the metamagnetic alloy Ni50Mn50-xSbx was plotted; it is shown that the addition of Sb leads to the competition between ferromagnetic and antiferromagnetic interaction of atoms, which causes magnetic phase transitions of these alloys. On the example of the Ni50Fe19Co4Ga27 alloy, it is shown that due to twinning, the value of the martensitic transformation temperature determined by dynamic mechanical analysis can differ by more than 10 degrees compared to calorimetry data. An alternative method of creating a surface acoustic wave (SAW) insulator based on a ferromagnet - nonmagnetic - ferromagnet - piezoelectric heterostructure in the spin-flop state, provided by non-collinear anisotropy of ferromagnetic layers, is demonstrated; the method has the advantage of a simpler technology of structure manufacturing. The nonlinear magnon-magnon and phonon-magnon scattering under the excitation of SAW in the GaN/CoFeB heterostructure are observed and explained.
Product Description
popup.authors
Verba Roman V.
Holub Volodymyr O.
Kosohor Anna О.
Popadiuk Daria L.
Titenko Anatolii M.
Ushii Lidiia I.
popup.nrat_date
2025-01-07
