Open AccessМагнитная структура наночастиц NiFe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=-
Author(s) -
A. S. Kamzin,
А. Bingolbali,
N. Dovgan,
Zerin Yeşil,
Meltem Asiltürk
Publication year - 2019
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2019.19.48320.17920
Subject(s) - spinel , materials science , crystallite , redistribution (election) , nanoparticle , magnetic moment , mössbauer spectroscopy , crystallography , nickel , ion , condensed matter physics , nanotechnology , chemistry , metallurgy , physics , organic chemistry , politics , political science , law
The Mössbauer studies of the magnetic structure of nickel ferrite (NiFe_2O_4) nanoparticles (NPs) are presented. It is shown that the redistribution of ions over nonequivalent crystallographic positions occurs upon a decrease in the size of NiFe_2O_4 crystallites to nanovalues, thus leading to the structural transformation of NiFe_2O_4 nanoparticles from inverse spinel to mixed spinel. It has been established that the magnetic moments of Fe ions in the volume of NiFe_2O_4 nanoparticles are ferromagnetically (collinearly) ordered, being noncollinear (or oblique) in the near-surface layer probably due to the frustration of moments in the near-surface layer of nanoparticles.