Interface exchange coupling induced enhancements in coercivity and maximal magnetic energy product of BaFe12O19/Co3O4 nanocomposites

Cao, Lili; Wang, Zhentao; Ye, Zhupeng; Zhang, Yuan; Zhao, Lei; Zeng, Yanwei

doi:10.1016/j.jallcom.2017.04.284

Cited by 13 publications

(6 citation statements)

References 39 publications

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“…Furthermore, the phenomenon of coagulation seems to decrease with the inclusion of dopants. It can be seen clearly from Figure 2 c that the shape of the grains is like that of plates having a rougher surface and a larger thickness, which would be due to the accumulation of metal oxide grains on the surface of CoLi 0.3 Zn 0.3 Fe 1.4 O 4, which can be proved from XPS analysis [ 36 ]. The doped samples ( x = 0.5) of cobalt ferrite (CoLi 0.5 Zn 0.5 Fe 1 O 4 ) are smaller, while un-doped cobalt ferrite shows agglomeration.…”

Section: Resultsmentioning

confidence: 99%

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

et al. 2023

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The vast applicability of spinel cobalt ferrite due to its unique characteristics implies the need for further exploration of its properties. In this regard, structural modification at the O-site of spinel with Li1+/Zn2+ was studied in detail for exploration of the correlation between structural, magnetic, and dielectric properties of the doped derivatives. The CTAB-assisted coprecipitation method was adopted for the synthesis of the desired compositions owing to its cost effectiveness and size controlling ability. Redistribution of cations at T- and O-sites resulted in the expansion of the crystal lattice, but no distortion of the cubic structure was observed, which further supports the flexible crystal structure of spinel for accommodating larger Li1+/Zn2+ cations. Moreover, an XPS analysis confirmed the co-existence of the most stable oxidation states of Zn2+, Li1+, Co2+, and Fe3+ ions with unstable Co3+ and Fe2+ ions as well, which induces the probability of hopping mechanisms to a certain extent and is a well-established behavior of cobalt ferrite nanoparticles. The experimental results showed that Li1+/Zn2+ co-doped samples exhibit the best magnetic properties at dopant concentration x = 0.3. However, increasing the dopant content causes disturbance at both sites, resulting in decreasing magnetic parameters. It is quite evident from the results that dielectric parameters are closely associated with each other. Therefore, dopant content at x = 0.1 is considered the threshold value exhibiting the highest dielectric parameters, whereas any further increase would result in decreasing the dielectric parameters. The reduced dielectric properties and enhanced magnetic properties make the investigated samples a potential candidate for magnetic recording devices.

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Section: Resultsmentioning

confidence: 99%

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

et al. 2023

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“…35 Many groups have studied the influence of various factors in hard-soft composites on the exchange interaction. 22,[36][37][38][39] Barium hexaferrite and Co 3 O 4 composites were synthesized by Cao et al 36 using an FM/AFM exchange coupling. Other groups noticed an exchange coupling between FiM and AFM.…”

Section: Introductionmentioning

confidence: 99%

“…Liu and co‐workers obtained SrFe 12 O 19 /CoO composites that interacted with FM and AFM 35 . Many groups have studied the influence of various factors in hard–soft composites on the exchange interaction 22, 36–39 . Barium hexaferrite and Co 3 O 4 composites were synthesized by Cao et al 36 .…”

Section: Introductionmentioning

confidence: 99%

Structure, magnetic, and electrodynamic properties of SrIn_xFe_12‐_xO₄/Ni_0.5Zn_0.5Fe₂O₄ composites at low temperature

Almessiere,

Algarou,

Slimani

et al. 2024

J Am Ceram Soc.

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Exchange‐coupled hard–soft bi‐magnetic ferrites can be used as isolators, microwave absorption materials, filters, hyperthermia materials, and biosensors with improved energy properties. The nanocomposites with the chemical composition SrInxFe12‐xO4/Ni0.5Zn05Fe2O4 (where x varies from 0.00 to 0.04) have the advantages of both materials: spinel and hexaferrite. The combination of Sr‐hexaferrate with spinel ferrite results in proximity effects, reversal of magnetization in two stages, and blocking temperatures that can be tuned in bi‐magnetic hard and soft ferrites. It was found an anomalius kink in the hysteresis loops and two peaks in the switching field distribution at x ≤ 0.02. The exchange interaction on the surfaces of hard and soft nanoparticles explains the behavior of the magnetic characteristics.

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“…The exchange bias effect is that the hysteresis loop of the ferromagnetic(FM) layer deviates from the magnetic field direction after the system is cooled from the Neel temperature (T Neel ) of anti-ferromagnetic(AFM). The systems can consist of permanent magnetic/soft magnetic [1], permanent magnetic/anti-ferromagnetic [2], (FM)/(AFM) [3], ferrimagnetic(FIM)/(AFM) [4] film system [5], core-shell system [6], alloy system [7], etc. In 1956, Meiklejohn and Bean [8] discovered the exchange bias effect, which was due to the spin interaction at the interface of Co nanoparticles covered by CoO, and the hysteresis loop moved along the magnetic field axis after the applied magnetic field cooled.…”

Section: Introductionmentioning

confidence: 99%

The exchange bias effects of CoFe₂O₄@NiO nanofibers fabricated by electrospinning

Dai

Feng

Cheng

et al. 2020

Mater. Res. Express

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Exchange bias effect(H EB ) systems offer various technological application, which has been playing a key role in spintronics. CoFe 2 O 4 @NiO with core-shell nanostructure has been synthesized through coaxial electronspinning. The exchange bias of CoFe 2 O 4 @NiO is different in the different molar ratio of core to shell, when the ratio of core to shell is 1:3, its maximum value is of 763 Oe at 5 K. Also, the values of Mr, Ms, Mr/Ms and Hc at 300 K and 5 K are first increases then decreases due to the molar ratio of NiO, its pinning effect play a vital role. Its anisotropy and magnetic domain structure have been primarily studied. The improvement of Hc will influence the H EB , which has a significant application value in spintronic devices.

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Interface exchange coupling induced enhancements in coercivity and maximal magnetic energy product of BaFe12O19/Co3O4 nanocomposites

Cited by 13 publications

References 39 publications

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

Structure, magnetic, and electrodynamic properties of SrIn_xFe_12‐_xO₄/Ni_0.5Zn_0.5Fe₂O₄ composites at low temperature

The exchange bias effects of CoFe₂O₄@NiO nanofibers fabricated by electrospinning

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Interface exchange coupling induced enhancements in coercivity and maximal magnetic energy product of BaFe12O19/Co3O4 nanocomposites

Cited by 13 publications

References 39 publications

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

Correlation between Magnetic and Dielectric Response of CoFe2O4:Li1+/Zn2+ Nanopowders Having Improved Structural and Morphological Properties

Structure, magnetic, and electrodynamic properties of SrInxFe12‐xO4/Ni0.5Zn0.5Fe2O4 composites at low temperature

The exchange bias effects of CoFe2O4@NiO nanofibers fabricated by electrospinning

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Product

Resources

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Structure, magnetic, and electrodynamic properties of SrIn_xFe_12‐_xO₄/Ni_0.5Zn_0.5Fe₂O₄ composites at low temperature

The exchange bias effects of CoFe₂O₄@NiO nanofibers fabricated by electrospinning