Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1007/s10948-017-4263-6

Ключевые слова: Ferrihydrite, magnetic properties, nanoparticles, structure

Аннотация: Nanoparticles of antiferromagnetic materials acquire the magnetic moment due to the surface effects and structural defects. According to the Neel hypothesis, magnetic moment μP of a particle containing N magnetically active atoms with magnetic moment J can be estimated as μP ∼ J · Nn or μP ∼ Vn, where V is the particle volume. Numerous studies of the magnetic properties of ferrihydrite 5Fe2O3⋅9H2O and ferritin revealed a value of n ≈ 1/2 for this material, in which Fe atoms have the octahedral surrounding of anions. We investigate the effect of low-temperature annealing of cobalt-doped ferrihydrite nanoparticles on their average size and magnetic properties. Using the Mössbauer spectroscopy study, we demonstrate that doping with Co makes Fe atoms enter the anion tetrahedra which leads to an increase in the exponent n〉1/2 in the expression μP ∼ J · Nn.

Журнал: Journal of Superconductivity and Novel Magnetism

Выпуск журнала: Vol. 31, Is. 4

Номера страниц: 1133-1138

ISSN журнала: 15571939

Издатель: Springer New York LLC

• Stolyar S.V. (Siberian Fed Univ, Krasnoyarsk, Russia; Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia)
• Balaev D.A. (Siberian Fed Univ, Krasnoyarsk, Russia; Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia)
• Krasikov A.A. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia)
• Dubrovskiy A.A. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia)
• Yaroslavtsev R.N. (Siberian Fed Univ, Krasnoyarsk, Russia; Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia)
• Bayukov O.A. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia)
• Volochaev M.N. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia)
• Iskhakov R.S. (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia)

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