Ultraviolet-light-induced oxide formation on GaAs surfaces

Lu, Zhaoming; Schmidt, Michael; Podlesnik, D. V.; Yu, Christine; Osgood, R. M.

doi:10.1063/1.459325

Cited by 44 publications

(20 citation statements)

References 58 publications

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“…Saturation magnetization, coercivity, and remanence values are listed in Table 4. For the core-shell NC/Si sample (S2), the irradiation-induced reduction in saturation might be expected since the shell changes from a ferrimagnetic material (Fe 3 O 4 ) 59 to an antiferromagnetic material (FeO). Note that for bulk FeO the Néel temperature (T N ) is 198 K, but it has been shown that thin FeO layers with Fe on either side show T N well above room temperature due to exchange interactions with FM spins.…”

Section: Results and Discussion A Structural Characterizationmentioning

confidence: 99%

Ion irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties

McCloy

Jiang

Droubay

et al. 2013

Journal of Applied Physics

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A cluster deposition method was used to produce films of loosely aggregated nanoclusters (NC) of Fe core-Fe 3 O 4 shell or fully oxidized Fe 3 O 4 . Films of these NC on Si(100) or MgO(100)/Fe 3 O 4 (100) were irradiated to 10 16 Si 2+ /cm 2 near room temperature using an ion accelerator. Ion irradiation creates structural change in the NC film with corresponding chemical and magnetic changes which depend on the initial oxidation state of the cluster. Films were characterized using magnetometry (hysteresis, first order reversal curves), microscopy (transmission electron, helium ion), and x-ray diffraction. In all cases, the particle sizes increased due to ion irradiation, and when a core of Fe is present, irradiation reduces the oxide shells to lower valent Fe species. These results show that ion irradiated behavior of the nanocluster films depends strongly on the initial nanostructure and chemistry, but in general saturation magnetization decreases slightly.

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Section: Results and Discussion A Structural Characterizationmentioning

confidence: 99%

Ion irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties

McCloy

Jiang

Droubay

et al. 2013

Journal of Applied Physics

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“…Some films have also been made to contain nanophases of Fe 3 O 4 by including nanoparticles in the target for pulsed laser deposition (PLD) [18] or by using a special substrate [19]. A number of studies have used assembled nanoparticles of Fe 3 O 4 that were sufficiently small that they would be in the superparamagnetic regime at RT in order to study the magnetoresistance [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties ofIn2O3containingFe3O4nanoparticles

et al. 2014

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Films of Fe-doped In 2 O 3 that were deliberately fabricated so they contained Fe 3 O 4 nanoparticles were deposited on sapphire substrates by pulsed laser deposition at low oxygen pressure. The concentration of Fe was varied between 1% and 5%, and the effect of including 5% of Sn and vacuum annealing were also investigated. Structural analysis indicated a high concentration of Fe 3 O 4 nanoparticles that caused substantial values of the coercive field at room temperature. Transport measurements indicated that the films were metallic, and an anomalous Hall effect was observed for the sample with 5% of Fe. The concentration of nanoparticles was reduced dramatically by the inclusion of 5% of Sn. Magnetic circular dichroism spectra taken in field and at remanence were analyzed to show that the samples had a magnetically polarized defect band located below the conduction band as well as magnetic Fe 3 O 4 nanoparticles. The signal from the defect states near the band edge was enhanced by increasing the number of carriers by either including Sn or by annealing in vacuum.

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“…Samples appeared to be unsaturated even at 30 kOe, likely due the ferrimagnetic nature of Fe 3 O 4 . 27 The estimated saturation magnetization is low compared to theoretical magnetite, however, probably a result of the low Fe/O ratio in the film.…”

Section: Resultsmentioning

confidence: 99%

Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition

Kaur

Jiang

Qiang

et al. 2014

Journal of Applied Physics

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Iron oxide films were produced using ion-beam-assisted deposition, and Raman spectroscopy and x-ray diffraction indicate single-phase magnetite. However, incorporation of significant fractions of argon in the films from ion bombardment is evident from chemical analysis, and Fe/O ratios are lower than expected from pure magnetite, suggesting greater than normal disorder. Low temperature magnetometry and first-order reversal curve measurements show strong exchange bias, which likely arises from defects at grain boundaries, possibly amorphous, creating frustrated spins. Since these samples contain grains $6 nm, a large fraction of the material consists of grain boundaries, where spins are highly disordered and reverse independently with external field. V C 2014 AIP Publishing LLC. [http://dx

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Ultraviolet-light-induced oxide formation on GaAs surfaces

Cited by 44 publications

References 58 publications

Ion irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties

Ion irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties

Magnetic properties ofIn2O3containingFe3O4nanoparticles

Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition

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