DOI: 10.1063/5.0088882
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Tailoring of defects dependent magnetic properties of swift heavy ion irradiated CeO<sub>2</sub> for spintronics application

Anshu Singh,Richa Saini,Pawan Kumar,Asokan Kandasami

Nanotechnology
Photoluminescence
Ferromagnetism
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The present investigation reports the swift heavy ion induced effects on cerium oxide (CeO 2 ) thin films. These thin films were deposited on Si (111) substrates by the electron-beam evaporation method and irradiated by a 100 MeV O 7+ ion beam with different ion fluences. X-ray diffraction analysis of these films confirms the stable fluorite phase of CeO 2 even after the higher fluence of irradiations. Raman measurement also supports the presence of the F 2g phase of CeO 2 and the presence of defect states. The Gaussian deconvolution of photoluminescence (PL) spectra reveals various defect-associated peaks. The broad peaks in the PL spectra are associated with oxygen vacancies and are red-shifted (494–520 nm) with ion fluences. The surface morphological images show the modification in the surface roughness with ion irradiation and the re-growth of smaller circular-formed nanoparticles on the surface is observed at the fluence of 5 × 10 11 ions/cm 2 . Magnetic measurements show an enhancement in magnetic ordering with ion irradiation. All the samples demonstrate room temperature ferromagnetism with magnetic saturation ( M s ) up to 14.57 emu/cm 3 . The saturation magnetization in irradiated thin films is directly correlated to the area under the peak of defect-associated PL emission. The mechanism such as the oxygen vacancy-based F-center exchange model is considered to understand the enhancement of ferromagnetism in ion irradiated CeO 2 thin films. Some popular theoretical models are also employed to determine various magnetic parameters.


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