Radial Domains in DyPr–FeCo–B Microwires

Коплак, О. В.; Sidorov, V. L.; Dvoretskaya, E. V.; Шашков, И. В.; Валеев, Р. А.; Королев, Д. В.; Моргунов, Р. Б.

doi:10.1134/s1063783421020116

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“…They are called single-molecular magnets (SMM) with conditionally long relaxation times limited by the single-ion anisotropy barrier, or single-ion magnets (SIM) with faster magnetic relaxation provided by quantum spin tunneling and other types of relaxation. Such materials are metal-organic complexes containing a single paramagnetic ion capable of exhibiting slow spin relaxation due, as a rule, to the presence of strong magnetic anisotropy of the type " light axis" [1,[15][16][17][18]. These ions are separated by a significant distance in the crystal lattice ∼ 1−2 nm, which weakens the exchange and magnetic dipole interactions between them, leading to the fulfillment of the above condition E ex ≪ E anis .…”

Section: Introductionmentioning

confidence: 99%

Nonlinearity and harmonics of the magnetic susceptibility of a Co-=SUP=-2+-=/SUP=- single-ion magnet in the paramagnetic region above the magnetic ordering temperature

Коплак

Dvoretskaya

Kunitsyna

et al. 2023

Physics of the Solid State

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In single-ion complexes based on Co2+ ions, the second and third harmonics of the magnetic susceptibility were found at temperatures of 2-4 K, which exceed the Neel temperature. The maxima of the second and third harmonics of the magnetic susceptibility are observed at a frequency of ~1 Hz, at which the maximum of the first harmonic is observed in a field of 3.2 kOe. An analysis of the dependences of the second and third harmonics of the magnetic susceptibility on the field and temperature showed that the nonlinearity arises as a result of the formation of a spin glass state at temperatures slightly higher than the Neel temperature. In this state, there is no long-range spin order, but there are spin clusters in the spin glass state. The spin-glass state in a compound with a Co2+ ion with a high magnetic anisotropy is unusual in that the exchange interaction is much smaller than the single-ion anisotropy energy. Keywords: molecular magnets, nonlinear magnetic susceptibility, nanostructures, spin dynamics, spin glass.

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Section: Introductionmentioning

confidence: 99%