2014
DOI: 10.7567/jjap.53.020306
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Control of magnetization in spinel-type Fe3O4 thin films by N2 ion implantation

Abstract: The magnetism of a typical spinel ferromagnetic oxide, Fe3O4, was controlled via ion implantation. Nitrogen ions were accelerated at 6–10 kV and irradiated to the 13-nm-thick Fe3O4 thin films with dosages of 2 × 1016 to 6 × 1016 ions/cm2. The magnetization decreased with the increase in ion dosage, and there was almost no magnetization when 6 × 1016 ions/cm2 of nitrogen was irradiated, irrespective of the acceleration voltages. The results of the temperature dependence of the magnetization and the Mössbauer st… Show more

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Cited by 12 publications
(5 citation statements)
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“…These suggest that the ferromagnetic components in the ion-implanted films have an almost uniform magnetic transition temperature throughout the layer, similar to the N 2 -implanted case. 13 Our TEM observations support the evidence for this similarity in their microstructure.…”
Section: Resultssupporting
confidence: 82%
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“…These suggest that the ferromagnetic components in the ion-implanted films have an almost uniform magnetic transition temperature throughout the layer, similar to the N 2 -implanted case. 13 Our TEM observations support the evidence for this similarity in their microstructure.…”
Section: Resultssupporting
confidence: 82%
“…3, together with the corresponding data for N 2 irradiation. 13 It decreases with the increase in dosage and reaches almost zero at dosage of 2 Â 10 15 , which is much smaller than the value for N 2 ion irradiation, 6 Â 10 16 ions/cm 2 . The Fe content estimated from XRF data was almost constant through the Kr ion implantation.…”
Section: Resultsmentioning
confidence: 65%
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“…The nanoparticles of Fe 3 O 4 exhibit super paramagnetism when their particle size is below 10-30 nm, i.e., smaller than the average size of magnetic domains (Lu et al, 2007;Gawande et al, 2013;Kita et al, 2014;Castellanos-Rubio et al, 2014;Qi et al, 2013;Zou et al, 2014;Gage et al, 2013). Super paramagnetism is governed particularly by a magnetization reversal mechanism for fine particles driven by the thermal energy.…”
Section: Introductionmentioning
confidence: 99%