期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 538, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2021.168317
关键词
Semiconductors; EPR; Magnetic interactions; Defects; Nanoparticles
资金
- CAPES
- CNPq
- FACEPE
This study investigated the effects of Y3+ inclusion in Fe3+ doped ZnO nanoparticles, revealing changes in linewidth, resonance field, lattice strain, and spin Hamiltonian parameters. Y3+ inclusion was found to enhance structural defects, alter lattice strain, and affect the crystal structure of ZnO, providing insights for potential applications in spintronic devices.
In this work, we investigated the effect of Y3+ inclusion in ZnO nanoparticles doped with Fe3+ synthesized by the sol gel method. Transmission Electron Microscopy (TEM) images showed agglomerated nanostructures with different shapes and average particle size distributions ranging from 6 nm to 44 nm in diameter. Electron Paramagnetic Resonance (EPR) studies of the Zn0.98_ yY0.02FeyO (y = 0.00, 0.02, 0.03 and 0.04) were carried out using X band (9.7 GHz) at room temperature. For undoped ZnO and doped with Y3+, complex line shapes were observed as a result of oxygen vacancies (VO+1). In addition, the Y3+ inclusion provokes an enhancement of the linewidth and the resonance field due to intrinsic defects in the hexagonal structure. This observation is compatible with a shortest relaxation time by reason of the particle size reduction and an extra antiferromagnetic local field as a result of the Y3+ presence. For co-doped ZnO samples, the EPR spectra confirms the presence of Fe3+ and Y3+ at the core Zn sites, altering the lattice strain of the ZnO structure. This result was monitored by the zero-field splitting (ZFS) parameters of the spin Hamiltonian, corroborating a reduction in the Fe - Fe interaction. The presence of Y ions was also confirmed in interstitial sites, resulting in a small g-shift from 4.2 to 4.0 associated with modifications of the rhombic component, E, of the Spin-Hamiltonian. This study contributes to the understanding of structural defects caused by the Y and Fe inclusion in the Wurtzite crystal structure of ZnO, a material with potential applications in spintronic devices.
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