Hopkinson Effect Study in Spinel and Hexagonal Ferrites

Sláma, J.; Šoka, Martin; Grusková, A.; González, Antonio Uriarte; Jančárik, Vladimír

doi:10.2478/v10187-011-0038-7

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…The ZFC curves have a peak just below T C . This peak is known as the Hopkinson peak [41][42][43] and the temperature is known as the Hopkinson peak temperature (T H ). This occurs due to the rapid decrease in magnetic anisotropy compared to the magnetization near T C .…”

Section: Magnetic Studymentioning

confidence: 99%

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe₁₂O₁₉

Sahoo

Barik

Ghosh

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Magnetic Studymentioning

confidence: 99%

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe₁₂O₁₉

Sahoo

Barik

Ghosh

et al. 2023

Phys. Chem. Chem. Phys.

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“…From Eq. 5 it can be explained, where M S is the spontaneous magnetization and K(T) is the anisotropy energy at a particular temperature [72]. The FM spin-spin correlation increases with the decrease in temperature.…”

Section: Ac Susceptibilitymentioning

confidence: 99%

The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y$_2$CoMnO$_6$ double perovskite

Khan,

Rajput,

Anas

et al. 2022

Preprint

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Combining experimental investigations and first-principles DFT calculations, we report physical and magnetic properties of Gd doped Y 2 CoMnO 6 (YCMO) double perovskite (DP), which are strongly influenced by antisite-disorder(ASD)-driven spin configurations. On Gd doping, Co and Mn ions are present in mixed valence (Co 3+ , Co 2+ , Mn 3+ and Mn 4+ ) states. Multiple magnetic transitions have been observed: i) field-induced paramagnetic to ferromagnetic transition at T C =95.5 K, ii) antiferromagnetic transition at T N =47 K due to 3d − 4f polarisation, iii) change in magnetization below T ≤20 K, primarily originating from Gd ordering, as revealed from our DFT calculations. AC susceptibility measurement confirms the absence of any spin-glass or cluster-glass phases in this material. A significantly large exchange bias (EB) effect (H EB =1.07 kOe) is found to occur below 47 K due to interfaces of FM and AFM clusters created by antisite-disorder.

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“…With the increase of temperature, the domain-wall mobility of soft magnetic MF increases, which leads to the increase of the real part of the permeability. [43,44] Conversely, the μ″ and tanμ of MF present a downtrend, which can be attributed to the weakening effects of temperature on magnetism. [13] There are no relaxation behaviors emerge or disappear with increase of temperature, only some changes in position, which can be proved by the Cole-Cole plots of MF-2 at different temperature (Figure S7, Supporting Information).…”

Section: Electromagnetic Properties At Elevated Temperaturementioning

confidence: 99%

Ultrathin Self‐Assembly MXene@flake Carbonyl Iron Composites with Efficient Microwave Absorption at Elevated Temperatures

Yao

Feng

Yao

et al. 2021

Adv Elect Materials

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waves produced by electronic devices, speed up information transmission while creating a lot of pollution, providing more and more harm to human beings. Thus, the investigation on lightweight and high efficiency EM absorbing materials and devices is widely developed. However, with the emergence of new application, such as 5G electronic devices, EM absorption materials are expected to show stable and efficient performance in thermal environments. There are rarely reports about EM absorbers to meet harsh requirement of thermal environments. The investigation of highly efficient, lightweight EM absorption materials at elevated temperature is still a great challenge.Recently, 2D materials apply to EM absorbers have attracted much attention. For example, graphene have been widely applied in EM absorbing materials due to high specific surface area, light weight, and excellent polarization loss, which enhance polarization to attenuate EM waves. [1] In addition, a class of metal carbide and metal nitride materials (MXene) as a new candidate in 2D materials has been extensively used in fields of EM absorbing and electromagnetic interference (EMI) shielding due to its excellent metal-like conductivity, abundant active surface functional groups, and good machine performance. [2][3][4][5] Ti 3 C 2 T x (T x represents OH, O, or F), a typical MXene material, can be used as a potential EMI material based on high conductivity, which has EMI effectiveness of 92 dB at 45 µm. [3] The metal-like conductivity of Ti 3 C 2 T x causes interface impedance mismatch resulting in poor EM absorbing performance, though there is part of the EM wave attenuation due to polarization and conductivity loss. It is considered that combination of dielectric and magnetic loss materials for high-efficiency EM wave absorbers as an effective strategy, which not only contributes to interface impedance matching of the material and EM waves, but also broadens the EM waves absorption mechanism. [6,7] Magnetic material-carbonyl iron powder, compared with ferrites and ferroalloys such as Fe 3 O 4 , [8] FeCo, [9] has the advantage of strong magnetic loss in the gigahertz frequency band, high Curie temperature, and low cost. [10] In addition, the flake carbonyl iron (FCI) possesses high anisotropy and its magnetic permeability is further enhanced. [11] It has been proven to exhibit the potential to be broadband andThe exploration for the potential lightweight and high efficiency microwave absorbers with thermal stability is a great challenge for researchers. More importantly, the electromagnetic parameters of absorbers at elevated temperatures are seldom studied. In this work, sandwich MXene-Ti 3 C 2 T x @flake carbonyl iron (MF) composites with tunable and efficient microwave absorption at elevated temperatures are successfully fabricated by an electrostatic selfassembly method. Both the complex permittivity and permeability of the MF are strongly temperature dependent in the temperature range of 298-473 K and X band (8.2-12.4 GHz). The efficient microwave ab...

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Hopkinson Effect Study in Spinel and Hexagonal Ferrites

Cited by 13 publications

References 8 publications

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe₁₂O₁₉

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe₁₂O₁₉

The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y$_2$CoMnO$_6$ double perovskite

Ultrathin Self‐Assembly MXene@flake Carbonyl Iron Composites with Efficient Microwave Absorption at Elevated Temperatures

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Hopkinson Effect Study in Spinel and Hexagonal Ferrites

Cited by 13 publications

References 8 publications

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe12O19

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe12O19

The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y$_2$CoMnO$_6$ double perovskite

Ultrathin Self‐Assembly MXene@flake Carbonyl Iron Composites with Efficient Microwave Absorption at Elevated Temperatures

Contact Info

Product

Resources

About

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe₁₂O₁₉

Manganese substitution induced magnetic transformation and magnetoelectricity in SrFe₁₂O₁₉