Tailoring the Structural, Magnetic, Mechanical, and Thermal Properties of CoFe2O4 by Varying Annealing Temperature for High-Density Storage Devices

Nitika, .; Rana, Anu; Kumar, Vinod

doi:10.1149/2162-8777/abed9b

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…The variation observed in the optical band gap is explained by correlating it with average crystallite size. A decrease in average crystallite size increases the binding energy of valence electrons and parent atoms, which increases the bandgap energy [61]. The trend verifies Brass's effective mass model.…”

Section: Fig 5 Absorption Spectra For Cnp Znp Fnp and Mnpsupporting

confidence: 66%

Study of magnetic and optical transitions in MFe2O4 (M=Co, Zn, Fe, Mn) with spinel structure

Nitika¹,

Rana²,

Kumar³

2021

Nanosystems: Phys. Chem. Math.

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Spinel ferrite (MFe 2 O 4 ) nanoparticles were successfully synthesized by the coprecipitation method. X-ray diffraction technique was employed for structural analysis. Single-phase cubic spinel structure with an average crystallite size ranging from 5 -20 nm was obtained for the prepared ferrites. The Fourier transform infrared spectra exhibits an absorption band at 550 cm −1 , which is attributed to metal-oxygen bond vibrations at tetrahedral sites. The thermogravimetric analysis revealed the instability of MnFe 2 O 4 and Fe 3 O 4 above 500 • C whereas CoFe 2 O 4 is found to be the most stable ferrite. The hysteresis parameters demonstrate the superparamagnetic nature of the prepared nanoparticles with low coercivity except for CoFe 2 O 4 . The direct optical band gap energy derived from UV-visible spectra is calculated to be 2.82, 2.83, 2.81, and 2.44 eV for M=Co, Zn, Fe, and Mn respectively. The magnetic and optical properties show a strong dependence on cation site occupancy.

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Section: Fig 5 Absorption Spectra For Cnp Znp Fnp and Mnpsupporting

confidence: 66%

Study of magnetic and optical transitions in MFe2O4 (M=Co, Zn, Fe, Mn) with spinel structure

Nitika¹,

Rana²,

Kumar³

2021

Nanosystems: Phys. Chem. Math.

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“…Magnetic nanomaterials with tunable structure/morphologies, high imaging abilities, and multivalent metal combination properties have been widely applied in highdensity magnetic storage, hard/soft magnetic nanocomposites, sensors, and drug carriers in biomedical technology. [38][39][40][41][42] Among them, magnetically ferromagnetic alloys with the synergistic interaction between transition metals (Tm) and rare earth (Re) metals have been highlighted in the field of catalysis due to the unique electronic structure in the 4f shell of Re metals. [43][44][45] As one of the Re-Tm nanoparticles, Sm/Co alloys with variable elements (Sm 3+ ; Co 3+ , Co 2+ , and Co 0 ) have been applied in the field of electrocatalysis and can be expected to be used as nanozymes in the field of tumor catalysis therapeutics.…”

Section: Introductionmentioning

confidence: 99%

Sm/Co‐Doped Silica‐Based Nanozymes Reprogram Tumor Microenvironment for ATP‐Inhibited Tumor Therapy

Ding

Chang

et al. 2023

Adv Healthcare Materials

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Current applications of multifunctional nanozymes for reprogramming the redox homeostasis of the tumor microenvironment (TME) have been severely confronted with low catalytic activity and the ambiguity of active sites of nanozymes, as well as the stress resistance from the rigorous physical environment of tumor cells. Herein, the Sm/Co‐doped mesoporous silica with 3PO‐loaded nanozymes (denoted as mSC‐3PO) are rationally constructed for simultaneously inhibiting energy production by adenosine triphosphate (ATP) inhibitor 3PO and reprogramming TME by multiactivities of nanozymes with photothermal effect assist, i.e., enhanced peroxidase‐like, catalase‐like activity, and glutathione peroxidase‐like activities, facilitating reactive oxygen species (ROS) generation, promoting oxygen content, and restraining the over‐expressed glutathione. Through the optimal regulation of nanometric size and doping ratio, the fabricated superparamagnetic mSC‐3PO enables the excellent exposure of active sites and avoids agglomeration owing to the large specific surface and mesoporous structure, thus providing adequate Sm/Co‐doped active sites and enough spatial distribution. The constructed Sm/Co centers both participate in the simulated biological enzyme reactions and carry out the double‐center catalytic process (Sm3+and Co3+/Co2+). Significantly, as the inhibitor of glycolysis, 3PO can reduce the ATP flow by cutting down the energy transform, thereby inhibiting tumor angiogenesis and assisting ROS to promote the early withering of tumor cells. In addition, the considerable near‐infrared (NIR) light absorption of mSC‐3PO can adapt to NIR excitable photothermal treatment therapy and photoexcitation‐promoted enzymatic reactions. Taken together, this work presents a typical therapeutic paradigm of multifunctional nanozymes that simultaneously reprograms TME and promotes tumor cell apoptosis with photothermal assistance.

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“…Electrolyte gating of cobalt ferrite has been studied recently, to tune the magnetic properties through voltage-driven ion migration, for low-power memory applications [23]. Apart from the fundamental studies, CRFO has extensive technological applications in spin filters [24], resistive switching [25], magneto-electronic devices [26], supercapacitors [27], magneto-optic media [28], biomedical devices [29], and highdensity storage device [30], etc.…”

Section: Introductionmentioning

confidence: 99%

A multilevel electrolyte-gated artificial synapse based on ruthenium-doped cobalt ferrite

Monalisha¹,

Li²,

Jin³

et al. 2023

Nanotechnology

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Synaptic devices that emulate synchronized memory and processing are considered the core components of neuromorphic computing systems for the low-power implementation of artificial intelligence. In this regard, electrolyte-gated transistors (EGTs) have gained much scientific attention, having a similar working mechanism as the biological synapses. Moreover, compared to a traditional solid-state gate dielectric, the liquid dielectric has the key advantage of inducing extremely large modulation of carrier density while overcoming the problem of electric pinholes, that typically occurs when using large-area films gated through ultra-thin solid dielectrics. Herein we demonstrate a three-terminal synaptic transistor based on ruthenium-doped cobalt ferrite (CRFO) thin films by electrolyte gating. In the CRFO-based EGT, we have obtained multilevel non-volatile conductance states for analog computing and high-density storage. Furthermore, the proposed synaptic transistor exhibited essential synaptic behavior, including spike amplitude-dependent plasticity (SADP), spike duration-dependent plasticity (SDDP), long-term potentiation (LTP), and long-term depression (LTD) successfully by applying electrical pulses. This study can motivate the development of advanced neuromorphic devices that leverage simultaneous modulation of electrical and magnetic properties in the same device and show a new direction to synaptic electronics.

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Tailoring the Structural, Magnetic, Mechanical, and Thermal Properties of CoFe2O4 by Varying Annealing Temperature for High-Density Storage Devices

Cited by 9 publications

References 24 publications

Study of magnetic and optical transitions in MFe2O4 (M=Co, Zn, Fe, Mn) with spinel structure

Study of magnetic and optical transitions in MFe2O4 (M=Co, Zn, Fe, Mn) with spinel structure

Sm/Co‐Doped Silica‐Based Nanozymes Reprogram Tumor Microenvironment for ATP‐Inhibited Tumor Therapy

A multilevel electrolyte-gated artificial synapse based on ruthenium-doped cobalt ferrite

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