Size effects in the formation of an uncompensated ferromagnetic moment in NiO nanoparticles

The magnetic properties of samples of NiO nanoparticles with average sizes of 23, 8.5, and 4.5 nm were investigated. Using the magnetization curves measured in strong (up to 250 kOe) pulsed magnetic fields, the contributions of the free spin and ferromagnetic subsystems were extracted. It has been f...

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Bibliographic Details
Published inJournal of applied physics Vol. 126; no. 10
Main Authors Popkov, S. I., Krasikov, A. A., Dubrovskiy, A. A., Volochaev, M. N., Kirillov, V. L., Martyanov, O. N., Balaev, D. A.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 14.09.2019
Subjects
Antiferromagnetism
Applied physics
Ferromagnetism
Magnetic properties
Magnetism
Magnetization curves
Nanoparticles
Nickel oxides
Size effects
Subsystems
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Summary:The magnetic properties of samples of NiO nanoparticles with average sizes of 23, 8.5, and 4.5 nm were investigated. Using the magnetization curves measured in strong (up to 250 kOe) pulsed magnetic fields, the contributions of the free spin and ferromagnetic subsystems were extracted. It has been found that the ferromagnetic contribution increases with a decrease in the nanoparticle size and is proportional to the fraction of uncompensated exchange-coupled spins. It is demonstrated that the uncompensated spins form in the antiferromagnetic NiO oxide due to an increase in the fraction of surface atoms in the nanoparticles with decreasing particle size and defects in the bulk of particles.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5109054