Structural, morphological and magnetic properties of iron oxide thin films obtained by atomic layer deposition as a function of their thickness

Márquez, Paulina; Alburquenque, Daniela; Célis, Freddy; Freire, Rafael M.; Escrig, Juan

doi:10.1016/j.jmmm.2021.167914

Cited by 12 publications

(3 citation statements)

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“…Each cycle consisted of a 0.015 s pulse of trimethylaluminum (Al(CH 3 ) 3 ) (TMA) (Sigma Aldrich, Santiago, Chile) with a 30 s purge, followed by a 0.015 s pulse of ultrapure water (H 2 O) with a 60 s purge. The precursors were used at room temperature, while the reactor was kept at a temperature of 80 [26]. It is important to note that throughout the process, a flow of 20 sccm of nitrogen was maintained.…”

Section: Synthesis Of Spherical Pvp/al 2 O 3 Particlesmentioning

confidence: 99%

“…On the other hand, the ozone at a volume concentration close to 10% was obtained from an ozone generator (Ol80W/FM100V) (Black Diamond, AB, Canada). The pulse times of ferrocene and ozone in the FeCp2/O3 cycle were 2 s and 0.2 s, respectively; the exposure and pump times were 5 s and 15 s, respectively, thus, obtaining spherical PVP/Al2O3/Fe2O3 particles [26]. It is important to note that throughout the process, a flow of 20 sccm of nitrogen was maintained.…”

Section: Thermal Reduction Process To Obtain Hollow Fe 3 O 4 Nanospheresmentioning

confidence: 99%

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Hollow Iron Oxide Nanospheres Obtained through a Combination of Atomic Layer Deposition and Electrospraying Technologies

et al. 2022

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In the present study, we report on the successful synthesis of hollow iron oxide nanospheres. The hollow Fe3O4 nanospheres were synthesized following a four-step procedure: electrospraying spherical PVP particles, coating these particles with alumina (Al2O3) and hematite (Fe2O3) through atomic layer deposition and, finally, a thermal reduction process to degrade the polymer (PVP) and convert hematite (Fe2O3) into magnetite (Fe3O4). A structural analysis using X-ray diffraction (XRD) confirmed the effectiveness of the thermal reduction process. A morphological analysis confirmed that the four-step procedure allowed for the obtainment of hollow iron oxide nanospheres, even though the reduction process caused a contraction in the diameter of the particles of almost 300 nm, but did not affect the thickness of the walls of the hollow spheres that remained at approximately 15 nm. Magnetic properties of the hollow iron oxide nanospheres enable their use in applications where the agglomeration of magnetic nanostructures in liquid media is commonly not allowed, such as in drug encapsulation and delivery.

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Section: Synthesis Of Spherical Pvp/al 2 O 3 Particlesmentioning

confidence: 99%

Section: Thermal Reduction Process To Obtain Hollow Fe 3 O 4 Nanospheresmentioning

confidence: 99%

Hollow Iron Oxide Nanospheres Obtained through a Combination of Atomic Layer Deposition and Electrospraying Technologies

et al. 2022

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“…Therefore, a tradeoff between insulating dielectric properties and the ability to hysteretically magnetize upon choosing the constituent materials is necessary. Engineering combinations of reliably resistively switching material layers, such as HfO 2 , with complementary compounds reliably magnetizing and also growing, such as Fe 2 O 3 [ 22 , 23 , 24 ], is justified and is to be purposefully examined in terms of both memory effects. Quite naturally, before the examination of coupling between hysteretic magnetization and electrical switching, it would be reasonable to examine the appearance of both effects separately, in order to attempt optimization of the deposition process and the forming structures.…”

Section: Introductionmentioning

confidence: 99%

Memory Effects in Nanolaminates of Hafnium and Iron Oxide Films Structured by Atomic Layer Deposition

et al. 2022

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HfO2 and Fe2O3 thin films and laminated stacks were grown by atomic layer deposition at 350 °C from hafnium tetrachloride, ferrocene, and ozone. Nonlinear, saturating, and hysteretic magnetization was recorded in the films. Magnetization was expectedly dominated by increasing the content of Fe2O3. However, coercive force could also be enhanced by the choice of appropriate ratios of HfO2 and Fe2O3 in nanolaminated structures. Saturation magnetization was observed in the measurement temperature range of 5–350 K, decreasing towards higher temperatures and increasing with the films’ thicknesses and crystal growth. Coercive force tended to increase with a decrease in the thickness of crystallized layers. The films containing insulating HfO2 layers grown alternately with magnetic Fe2O3 exhibited abilities to both switch resistively and magnetize at room temperature. Resistive switching was unipolar in all the oxides mounted between Ti and TiN electrodes.

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Ferrite Films

Zaag¹,

Fitchorova²,

Соколов³

et al. 2022

Modern Ferrites

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Structural, morphological and magnetic properties of iron oxide thin films obtained by atomic layer deposition as a function of their thickness

Cited by 12 publications

References 53 publications

Hollow Iron Oxide Nanospheres Obtained through a Combination of Atomic Layer Deposition and Electrospraying Technologies

Hollow Iron Oxide Nanospheres Obtained through a Combination of Atomic Layer Deposition and Electrospraying Technologies

Memory Effects in Nanolaminates of Hafnium and Iron Oxide Films Structured by Atomic Layer Deposition

Ferrite Films

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