%0 Journal Article
%A Gandhi, Ashish
Chhaganlal
%A Pradeep, R.
%A Yeh, Yu-Chen
%A Li, Tai-Yue
%A Wang, Chi-Yuan
%A Hayakawa, Y.
%A Wu, Sheng Yun
%D 2018
%T Understanding the Magnetic Memory Effect in Fe-Doped
NiO Nanoparticles for the Development of Spintronic Devices
%U https://acs.figshare.com/articles/journal_contribution/Understanding_the_Magnetic_Memory_Effect_in_Fe-Doped_NiO_Nanoparticles_for_the_Development_of_Spintronic_Devices/7575533
%R 10.1021/acsanm.8b01898.s001
%2 https://acs.figshare.com/ndownloader/files/14072255
%K nanoparticle
%K Fe-Doped NiO Nanoparticles
%K Fe concentration
%K Fe content
%K cluster-glassy system
%K semiconductor spintronic devices
%K Magnetic Memory Effect
%X Uniform
hexagonal single phase Ni1–xFexO (x = 0, 0.01,
0.05, and 0.1) nanoparticles synthesized by a standard hydrothermal
method are characterized with an enhanced lattice expansion along
with a decrease in the microstrain, crystal size, and Ni occupancy
as a function of the Fe concentration. The observed anomalous temperature
and field dependent magnetic properties as a function of the Fe content
were explained using a core–shell type structure of Ni1–xFexO
nanoparticle such that the effect of Fe-doping has led to a decrease
of disordered surface spins and an increase of uncompensated-core
spins. Perfect incorporation of Fe3+ ions at the octahedral
site of NiO was observed from the low Fe concentration; however, at
a higher Fe content, 4:1 defect clusters (four octahedral Ni2+ vacancies surrounding an Fe3+ tetrahedral interstitial)
are formed in the core of the nanoparticles, resulting in the transition
of spin-glassy to the cluster-glassy system. An enhanced thermal magnetic
memory effect is noted from the cluster-glassy system possibly because
of increased intraparticle interactions. The outcome of this study
is important for the future development of diluted magnetic semiconductor
spintronic devices and the understanding of their fundamental physics.
%I ACS Publications