Exchange-coupling effect in hard/soft SrTb0.01Tm0.01Fe11.98O19/AFe2O4 (where A = Co, Ni, Zn, Cu and Mn) composites

Algarou, N.A.; Slimani, Y.; Güner, S.; Baykal, A.; Ercan, I.; Kögerler, Paul

doi:10.1016/j.ceramint.2019.11.201

Cited by 37 publications

(7 citation statements)

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“…H c reduced sharply to values of 155 and 319 Oe for the x = 3.0 product. Generally, two chief interactions prevail in hard/soft products; those among hard/hard grains and soft/soft grains that are referred as dipolar interactions and those between hard/soft grains that are denoted as exchange-coupling interactions [49,50]. When the dipolar interactions are irrelevant, the magnetization is chiefly governed by exchange interactions and magneto-crystalline anisotropy.…”

Section: Vsm Investigationmentioning

confidence: 99%

Functional Sr0.5Ba0.5Sm0.02Fe11.98O4/x(Ni0.8Zn0.2Fe2O4) Hard–Soft Ferrite Nanocomposites: Structure, Magnetic and Microwave Properties

et al. 2020

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This paper reports the correlation between the composition of the functional Sr0.5Ba0.5Sm0.02Fe11.98O19/x(Ni0.8Zn0.2Fe2O4) hard–soft nanocomposites (SrBaSmFe/x(NiZnFe) NCs), where 0.0 ≤ x ≤ 3.0, and their structural features, magnetic, and microwave properties. SrBaSmFe/x(NiZnFe) hard/soft ferrite NCs are produced using the one-pot citrate combustion method. According to the XRD analysis, all samples showed the co-existence of both SrBaSmFe and NiZnFe phases in different ratios. Magnetic properties are measured in a wide range of magnetic fields and temperatures (10 and 300 K) and correlated well with the composition of the investigated samples. The microwave properties (frequency dispersions of the magnetic permeability, and electrical permittivity) are discussed by using the co-axial method in the frequency range of 0.7–18 GHz. Non-linear dependences of the main microwave features were observed with varying of composition. The microwave behavior correlated well with the composite theory. These results could be used in practice for developing antenna materials.

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Section: Vsm Investigationmentioning

confidence: 99%

Functional Sr0.5Ba0.5Sm0.02Fe11.98O4/x(Ni0.8Zn0.2Fe2O4) Hard–Soft Ferrite Nanocomposites: Structure, Magnetic and Microwave Properties

et al. 2020

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“…Indeed, the substitution of scandium at the M-type of hexaferrite has previously been investigated and shown a significant modification in its magnetic, microwave, and structural properties. [40][41][42][43] Bierlich et al [44] investigated the effect of doping Sc 3+ ions on the position of Fe 3+ ions at the BaSc x Fe 12-x O 19 . They observed that with increasing the amount of ratio (x) from 0 to 2, the curve shape of the hysteresis loop altered progressively to the form of soft phase.…”

Section: Magnetic Characteristicsmentioning

confidence: 99%

“…Therefore, the integration of hard ferrite and soft ferrite is a perspective to obtain a remarkable enhancement in overall magnetic properties rather than itself. [19,20] Exchange-coupling behavior in the design of H/S ferrites NCs has been largely investigated for permanent magnet and microwave devices because of the significant change in magnetic characteristics to develop materials with controllable magnetic properties. [21,22] Various studies on hard/soft exchange-coupling materials for numerous applications can be found in literature.…”

Section: Introductionmentioning

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

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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.

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“…This is mostly recognized to the mitigation of the thermal energy effects. 41,42 Whatever it is at 300 or 10 K, the initial introduction of the soft NFSO phase of a mass ratio x = 1, within the hard-soft nanocomposites, showed a strengthening in M s , M r , and H c data compared to the pristine CFO product. The enhancement in the magnetization is mainly due to the higher M s data of the soft NFSO ferrite phase (at both RT and LT) compared to the hard CFO phase.…”

Section: Magnetizationmentioning

confidence: 99%

Investigation of hard/soft CoFe ₂ O ₄ / NiSc ₀ _. ₀₃ Fe ₁ _. ₉₇ O ₄ <

et al. 2021

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The hard/soft CoFe 2 O 4 /(NiSc 0.03 Fe 1.97 O 4 ) x (0 ≤ x ≤ 5) or simply (CFO-xNFSO) nanocrystals (NCs) were synthesized through sol-gel auto-combustion technique. The structural and magnetic properties of the ferrite composite NCs were explored in detail. The synthesized NCs were applied in the fabrication of supercapacitor electrodes to investigate their potential in energy storage applications. The cubic spinel ferrite phase of the NCs was verified by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM) techniques. The NCs with different x ratios displayed smoothed magnetic hysteresis loops during magnetization at 300 and 10 K temperature. In addition, the plots of switching field distribution (SFD) indicated a single peak in dM/dH vs H plots. These findings demonstrate a good exchange-coupling in the CFO-xNFSO (0.0 ≤ x ≤ 5) magnetic NCs. The supercapacitor devices fabricated from the synthesized NCs displayed enhanced capacitance and relatively high energy density as compare to electric double-layer (EDL) (carbon-based) supercapacitors. The supercapacitor fabricated from CFO-xNFSO for x = 2 showed best performance in terms of specific capacitance with 204.4 F g À1 at a scan rate of 10 mV s À1 . The performances of the fabricated supercapacitors were further tested for a higher potential window of 1.2 V, where a specific energy value of 33.2 Wh kg À1 is achieved that is 144% enhancement from the same supercapacitor working at 0.8 V and 187% enhancement as compared to the carbon-based supercapacitor. The device also displayed excellent stability as it was tested for 5000 chargedischarge cycles.

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Exchange-coupling effect in hard/soft SrTb0.01Tm0.01Fe11.98O19/AFe2O4 (where A = Co, Ni, Zn, Cu and Mn) composites

Cited by 37 publications

References 50 publications

Functional Sr0.5Ba0.5Sm0.02Fe11.98O4/x(Ni0.8Zn0.2Fe2O4) Hard–Soft Ferrite Nanocomposites: Structure, Magnetic and Microwave Properties

Functional Sr0.5Ba0.5Sm0.02Fe11.98O4/x(Ni0.8Zn0.2Fe2O4) Hard–Soft Ferrite Nanocomposites: Structure, Magnetic and Microwave Properties

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

Investigation of hard/soft CoFe ₂ O ₄ / NiSc ₀ _. ₀₃ Fe ₁ _. ₉₇ O ₄ <

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Exchange-coupling effect in hard/soft SrTb0.01Tm0.01Fe11.98O19/AFe2O4 (where A = Co, Ni, Zn, Cu and Mn) composites

Cited by 37 publications

References 50 publications

Functional Sr0.5Ba0.5Sm0.02Fe11.98O4/x(Ni0.8Zn0.2Fe2O4) Hard–Soft Ferrite Nanocomposites: Structure, Magnetic and Microwave Properties

Functional Sr0.5Ba0.5Sm0.02Fe11.98O4/x(Ni0.8Zn0.2Fe2O4) Hard–Soft Ferrite Nanocomposites: Structure, Magnetic and Microwave Properties

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

Investigation of hard/soft CoFe 2 O 4 / NiSc 0 . 03 Fe 1 . 97 O 4 <

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

Investigation of hard/soft CoFe ₂ O ₄ / NiSc ₀ _. ₀₃ Fe ₁ _. ₉₇ O ₄ <