Clear antiferromagnetism induced by vacancies in ZnO nanoparticles synthesized by alkali salt method
Por:
Ascencio, Francisco, Reyes-Damian, C., ESCUDERO, ROBERTO
Publicada:
1 may 2022
Resumen:
Herein, the synthesis, structural characterization, and magnetic
characteristics of ZnO nano-particles were studied. Pure wurtzite
nanoparticles were grown into an alkali salt environment with a size of
10.37 +/- 0.4 nm, determined by transmission electron microscopy. X-ray
diffraction, Rietveld refinement, Raman, UV-Vis, photoluminescence
spectroscopy, and atomic-resolution electron microscopy were performed
to verify the structure and purity of the produced nanoparticles.
Additionally, magnetization versus temperature measurements showed a
low-temperature peak related to an antiferromagnetic transition of
oxygen. This peak changes its shape with the rise of the magnetic field,
and it practically disappears at 10,000 Oe. In addition, we observed
that the transition to diamagnetism occurred at a lower temperature.
Magnetization as a function of magnetic field curves presents the
coexistence of antiferromagnetic and ferromagnetic behavior at 2 K.
Meanwhile, diamagnetism was observed at magnetic fields over 1500 Oe and
ferromagnetism between +/- 1500 Oe at 300 K; these features were related
to the vacancies of O and Zn.
Filiaciones:
Ascencio, Francisco:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Reyes-Damian, C.:
Univ Nacl Autonoma Mexico, Inst Fis, Ciudad De Mexico 04510, Mexico
ESCUDERO, ROBERTO:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
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