Ferroic Transition Metal Oxide Nano‐heterostructures: From Fundamentals to Applications

Varvaro, G.; Omelyanchik, Alexander; Peddis, Davide

doi:10.1002/9783527826940.ch12

Cited by 7 publications

(5 citation statements)

References 178 publications

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“…Our nano-heterostructures are the result of the high control of interface epitaxy achieved through controlled annealing, which produces a [100]// [1][2][3][4][5][6][7][8][9][10] texture between SFO and CFO induced by the (111) of preformed CFO (as depicted in Figure 6c, together with a schematic of the reversal). Knowing that the easy axes are not parallel to each other (while the SFO core has an out-of-plane easy axis, the CFO layer tends to lie along the [100] axis) [60,61] induce to believe that the strong coupling is not due to dipolar interaction between the two materials, as it may be the case for such misinterpretation if the easy axes were aligned.…”

Section: Relaxation M(t) Measurementsmentioning

confidence: 99%

“…[1][2][3][4][5] Functional oxide nanocomposites (NCs) have demonstrated great potential in this regard, based on the combination of DOI: 10.1002/smll.202304152 two or more phases to create functional materials with tunable magnetic properties. [6][7][8][9][10] In this context, multiphase nano-heterostructures have attracted a huge interest in developing a new class of materials with enhanced magnetic properties. [11][12][13] In particular, the idea of maximizing the energy product of permanent magnets through the design of exchange-coupled systems made of magnetically softer (with high saturation) and harder (with large coercivity and remanent magnetization) nanocrystallites is well-established.…”

Section: Introductionmentioning

confidence: 99%

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Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures

Maltoni,

Barucca,

Rutkowski

et al. 2023

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The magnetic coupling of a set of SrFe12O19/CoFe2O4 nanocomposites is investigated. Advanced electron microscopy evidences the structural coherence and texture at the interfaces of the nanostructures. The fraction of the lower anisotropy phase (CoFe2O4) is tuned to assess the limits that define magnetically exchange‐coupled interfaces by performing magnetic remanence, first‐order reversal curves (FORCs), and relaxation measurements. By combining these magnetometry techniques and the structural and morphological information from X‐ray diffraction, electron microscopy, and Mössbauer spectrometry, the exchange intergranular interaction is evidenced, and the critical thickness within which coupled interfaces have a uniform reversal unraveled.

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Section: Relaxation M(t) Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures

Maltoni,

Barucca,

Rutkowski

et al. 2023

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“…Ni 2+ tends to occupy the O h sites, while Zn 2+ prefers T d sites. 11,22,23 The selectivity for different sites leads to a change in the inversion degree of the spinel structure.…”

Section: Introductionmentioning

confidence: 99%

Chemical engineering of cationic distribution in spinel ferrite nanoparticles: the effect on the magnetic properties

Baričić,

Maltoni,

Barucca

et al. 2024

Phys. Chem. Chem. Phys.

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“…Cobalt ferrite has the strongest spin-orbital coupling and anisotropy constant when compared to other MNPs. These features, together with the others stated above, make CoFe 2 O 4 one of the most significant NPs for biological applications [ 7 , 8 , 9 ]. In the biological system, nanoparticles have been widely studied as therapeutic agents and carriers for medical applications [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Cobalt Iron Oxide (CoFe2O4) Nanoparticles Induced Toxicity in Rabbits

Khan

Buzdar

Hussain

et al. 2023

Veterinary Sciences

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The market for nanoparticles has grown significantly over the past few decades due to a number of unique qualities, including antibacterial capabilities. It is still unclear how nanoparticle toxicity works. In order to ascertain the toxicity of synthetic cobalt iron oxide (CoFe2O4) nanoparticles (CIONPs) in rabbits, this study was carried out. Sixteen rabbits in total were purchased from the neighborhood market and divided into two groups (A and B), each of which contained eight rabbits. The CIONPs were synthesized by the co-precipitation method. Crystallinity and phase identification were confirmed by X-ray diffraction (XRD). The average size of the nanoparticles (13.2 nm) was calculated by Scherrer formula (Dhkl = 0.9 λ/β cos θ) and confirmed by TEM images. The saturation magnetization, 50.1 emug−1, was measured by vibrating sample magnetometer (VSM). CIONPs were investigated as contrast agents (CA) for magnetic resonance images (MRI). The relaxivity (r = 1/T) of the MRI was also investigated at a field strength of 0.35 T (Tesla), and the ratio r2/r1 for the CIONPs contrast agent was 6.63. The CIONPs were administrated intravenously into the rabbits through the ear vein. Blood was collected at days 5 and 10 post-exposure for hematological and serum biochemistry analyses. The intensities of the signal experienced by CA with CIONPs were 1427 for the liver and 1702 for the spleen. The treated group showed significantly lower hematological parameters, but significantly higher total white blood cell counts and neutrophils. The results of the serum biochemistry analyses showed significantly higher and lower quantities of different serum biochemical parameters in the treated rabbits at day 10 of the trial. At the microscopic level, different histological ailments were observed in the visceral organs of treated rabbits, including the liver, kidneys, spleen, heart, and brain. In conclusion, the results revealed that cobalt iron oxide (CoFe2O4) nanoparticles induced toxicity via alterations in multiple tissues of rabbits.

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Ferroic Transition Metal Oxide Nano‐heterostructures: From Fundamentals to Applications

Cited by 7 publications

References 178 publications

Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures

Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures

Chemical engineering of cationic distribution in spinel ferrite nanoparticles: the effect on the magnetic properties

Cobalt Iron Oxide (CoFe2O4) Nanoparticles Induced Toxicity in Rabbits

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