Magnetic properties improvement through exchange-coupling in hard/soft SrFe12O19/Co nanocomposite

Alipour, A Bakhsh; Torkian, Sh; Ghasemi, Ali; Tavoosi, M.; Gordani, Gholam Reza

doi:10.1016/j.ceramint.2020.09.089

Cited by 23 publications

(14 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Then, its magnetic moments require adding an extra magnetic field or applying a driving force to reverse all spins toward the H. [67] The incorporation of the NiFe to the SrBaSc originates an interfacial region. [67,68] At this region, NiFe has a low amount of magnetocrystalline anisotropy and subsequently, its magnetic moments can softly orientation to the H. [66][67][68] It can also supply a force (torque) to the hindered spins at the Sr 0.5 Ba 0.5 Fe 12 O 19 to switch their direction to H and to occur the exchange coupling. [67] However, in this sample, not all hindered spins rotated to the magnetic field due to the few contents of the soft phase.…”

Section: Magnetic Characteristicsmentioning

confidence: 99%

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr_0.5Ba_0.5Sc_xFe_12‐_xO₁₉/NiFe₂O₄ Hard/Soft Nanocomposites

Almessiere

Slimani

Algarou

et al. 2021

Adv Elect Materials

View full text Add to dashboard Cite

The Sr0.5Ba0.5ScxFe12–xO19(SrBaSc)/NiFe2O4(NiFe) hard–soft nanocomposites (NCs) are synthesized by in situ sol–gel route. Impact of Sc3+ doping on their structure, morphology, and magnetic properties are examined. X‐ray diﬀraction confirms the coexistence of SrBaSc and NiFe phases without any impurity. Morphology of NCs reveals a cluster of hexagonal plate decorated by spherical grains. Magnetic characteristics of the NCs are examined by using a vibration sample magnetometer at room temperature and 10 K. The x = 0.000 sample shows some kinks in their M–H loops and the occurrence of two peaks in dM/dH(H). All the NCs with Sc3+ exhibit smooth shapes of M–H curves with single peak, revealing the complete and perfect exchange coupling behavior. The diverse magnetic parameters at both temperatures are determined. The values of saturation and remanent magnetizations are decreasing with the Sc content increase. The intensive electromagnetic absorption is observed in all the samples. Reﬂection loss (RL) of more than ‐18 dB is observed above 3 GHz. Strong coupling between Sc concentration and amplitude–frequency characteristics of the RL can be used for developing of the functional media for high‐frequency devices and will open broad perspectives for practical application in radar‐absorbing technology and electromagnetic compatibility.

show abstract

Section: Magnetic Characteristicsmentioning

confidence: 99%

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr_0.5Ba_0.5Sc_xFe_12‐_xO₁₉/NiFe₂O₄ Hard/Soft Nanocomposites

Almessiere

Slimani

Algarou

et al. 2021

Adv Elect Materials

View full text Add to dashboard Cite

show abstract

“…For the preparation of nanocomposite, physical mixing method is used [16], [17]. In this method, Copper doped BaFe12O19 was physically stirred with CoZnFe2O4 at various hard to soft site such as 90/10 and 80/20 to make the nanocomposites[(Cu0.5Ba0.5Fe12O19)1-x/ (Co0.6Zn0.4 Fe2O4) x].…”

Section: Preparation Of Nanocomposite Materialsmentioning

confidence: 99%

Study of Bandgap Energy of Novel Nanocomposite

Sudhakaran¹,

Sudhakaran²,

Senthil³

2021

IJRTE

View full text Add to dashboard Cite

In this novel work, we have studied the optical properties of CuBaM-CZFO nanocomposites. (Cu0.5Ba0.5Fe12O19)1-x/ (Co0.6Zn0.4 Fe2O4) x [where x=0.1,0.2] nanocomposites were synthesized individually by sol-gel citrate method and then made into nanocomposites by physical mixing technique. Further characterization over their structural, morphological and optical properties were carried out in detail. With the help of UV analysis, the optical properties such as, the band gap energy was discovered which is found using Tauc’s plot. The bandgap energy is 2.6503eV for CuBaM-CZFO 90-10 which is lesser than CuBaM-CZFO 80-20 (2.8456eV). The structural, morphological and optical properties of novel CuBaM-CZFO nanocomposite are reported and compared with, both among themselves and from the literature review.

show abstract

“… 2 − 15 Also, composites of SFO with soft magnetic phases and improved magnetic properties achieved through the exchange-spin mechanism have been reported in the literature. 3 , 10 , 16 , 17 For instance, using a conducting polymer and a SFO content for tunability, polypyrrole/SFO composites were designed and tested for efficient EM-shielding purposes. 10 It was demonstrated that the electrical and magnetic properties of such composites can be controlled simply by tuning the SFO content.…”

Section: Introductionmentioning

confidence: 99%

Aluminum Doping and Nanostructuring Enabled Designing of Magnetically Recoverable Hexaferrite Catalysts

et al. 2022

View full text Add to dashboard Cite

We demonstrate an approach based on substituting a magnetic cation with a carefully chosen isovalent non-magnetic cation to derive catalytic activity from otherwise catalytically inactive magnetic materials. Using the model system considered, the results illustratively present that the catalytically inactive but highly magnetic strontium hexaferrite (SrFe 12 O 19 ; SFO) system can be transformed into a catalytically active system by simply replacing some of the magnetic cation Fe 3+ by a non-magnetic cation Al 3+ in the octahedral coordination environment in the SFO nanocrystals. The intrinsic SFO and Al-doped SrFe 12 O 19 (SrFe 11.5 Al 0.5 O 19 ; Al–SFO) nanomaterials were synthesized using a simple, eco-friendly tartrate-gel technique, followed by thermal annealing at 850 °C for 2 h. The SFO and Al–SFO were thoroughly characterized for their structure, phase, morphology, chemical bonding, and magnetic characteristics using X-ray diffraction, Fourier-transform infrared spectroscopy, and vibrating sample magnetometry techniques. Catalytic performance evaluated toward 4-nitrophenol, which is the toxic contaminant at pharmaceutical industries, reduction reaction using NaBH 4 (mild reducing agent), the Al-doped SFO samples exhibit a reasonably good performance compared to intrinsic SFO. The results indicate that the catalytic activity of Al–SFO is due to Al-ions occupying the octahedral sites of the hexaferrite lattice; as these sites are on the surface of the catalyst, they facilitate electron transfer. Furthermore, surface/interface characteristics of nanocrystalline Al–SFO coupled with magnetic properties facilitate the catalyst recovery by simple, inexpensive methods while readily allowing the reusability. Moreover, the activity remains the same even after five successive cycles of experiments. Deriving the catalytic activity from otherwise inactive compounds as demonstrated in the optimized, engineered nanoarchitecture of Al-doped-Sr-hexaferrite may be useful in adopting the approach in exploring further options and designing inexpensive and recyclable catalytic materials for future energy and environmental technologies.

show abstract

Magnetic properties improvement through exchange-coupling in hard/soft SrFe12O19/Co nanocomposite

Cited by 23 publications

References 51 publications

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr_0.5Ba_0.5Sc_xFe_12‐_xO₁₉/NiFe₂O₄ Hard/Soft Nanocomposites

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr_0.5Ba_0.5Sc_xFe_12‐_xO₁₉/NiFe₂O₄ Hard/Soft Nanocomposites

Study of Bandgap Energy of Novel Nanocomposite

Aluminum Doping and Nanostructuring Enabled Designing of Magnetically Recoverable Hexaferrite Catalysts

Contact Info

Product

Resources

About

Magnetic properties improvement through exchange-coupling in hard/soft SrFe12O19/Co nanocomposite

Cited by 23 publications

References 51 publications

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr0.5Ba0.5ScxFe12‐xO19/NiFe2O4 Hard/Soft Nanocomposites

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr0.5Ba0.5ScxFe12‐xO19/NiFe2O4 Hard/Soft Nanocomposites

Study of Bandgap Energy of Novel Nanocomposite

Aluminum Doping and Nanostructuring Enabled Designing of Magnetically Recoverable Hexaferrite Catalysts

Contact Info

Product

Resources

About

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr_0.5Ba_0.5Sc_xFe_12‐_xO₁₉/NiFe₂O₄ Hard/Soft Nanocomposites

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr_0.5Ba_0.5Sc_xFe_12‐_xO₁₉/NiFe₂O₄ Hard/Soft Nanocomposites