Synthesis of single-domain chromium dioxide nanoparticles with high coercivity

Osmolovskaya, O. M.; Arkhipov, D. I.; Gordeev, S. V.; Dzidziguri, É. L.; Осмоловский, М. Г.

doi:10.1134/s1070363215040362

Cited by 5 publications

(1 citation statement)

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“…Таким образом, получение порошков с высокой коэрцитивной силой сводится, в частности, к задаче синтеза однодоменных наночастиц диоксида хрома. Эту задачу можно решить, контролируя размеры и форму наночастицы путем использования малого количества модифицирующих добавок в процессе гидротермального синтеза [2].…”

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COERCIVE FORCE IN THE SYSTEM OF FERROMAGNETIC GRANULES FOR HALF METAL CrO2 WITH PERCOLATION CONDUCTIVITY

Далакова¹,

Beliayev²,

Horielyi³

2017

EEJP

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Magnetic and magnetoresistive properties of several samples of compacted powders of ferromagnetic half-metal CrO 2 , consisting of needle-shaped or spherical nanoparticles coated with thin dielectric shells, were investigated in wide temperature range. The temperature dependence of the coercive force H c (T) is compared with the temperature dependence of the field of maximum of positive tunneling magnetoresistance H p (T). The dependence of H p (T) was nonmonotonic one. It is found that in the low-temperature range (4.2 ÷ 70 K) the ratio H p ≈ H c , expected for compacted ferromagnetic powders with particles of submicron sizes, does not fulfilled. It is assumed that the possible reason of the difference between H p and H c is the mismatch between the orientation of the global magnetization of the entire sample and the orientations of the magnetic moments in some part of granules that form the optimal conducting channels at low temperatures. Such a mismatch may be due to the multidomain granules are more prone to the formation of optimal conducting chains in the transport channels. That leads to a change in the mechanism of magnetization reversal in these channels and to violation of the ratio H p ≈ H c .

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