Open AccessSuperparamagnetic nanoparticles formed in Fe-implanted ZnO
Author(s) -
Pan Feng,
B.Z. Ding,
Tao Fa,
Fengfeng Cheng,
Shengqiang Zhou,
Shuo Yao
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.108501
Subject(s) - materials science , superparamagnetism , channelling , annealing (glass) , nanoparticle , rutherford backscattering spectrometry , ferromagnetism , squid , synchrotron , magnetometer , synchrotron radiation , analytical chemistry (journal) , ion implantation , nuclear magnetic resonance , condensed matter physics , magnetic field , ion , nanotechnology , magnetization , thin film , optics , metallurgy , chemistry , physics , organic chemistry , quantum mechanics , chromatography , ecology , biology
Due to its potential application to diluted magnetic oxides, transition metal doped ZnO has been under intensive investigation. We present a correlation between the structural and the magnetic properties of Fe implanted ZnO bulk crystals. Crystalline damage recovery, structural and magnetic properties are studied by Rutherford backscattering spectrometry and channelling (RBS/C), synchrotron radiation X-ray diffraction (SR-XRD), and superconducting quantum interference device magnetometer (SQUID), respectively. The 623 K Fe ion implantation and the high vacuum annealing at 823 K lead to the formation of secondary phase -Fe and -Fe nanoparticles. The discrepancy between the zero-field cooling and the field cooling curves further indicates that Fe-implanted ZnO is superparamagnetic and the observed ferromagnetism originates from the Fe nanoparticles.