Spin–orbit coupling in magnetoelectric Ba3(Zn1−xCox)2Fe24O41 hexaferrites

Xu, Chao; Zhang, An-Lei; Feng, Zhenjie; Lü, Weijia; Kang, Baojuan; Zhang, Jincang; Ge, Jun‐Yi; Cao, Shixun

doi:10.1039/c9cp04783b

Cited by 16 publications

(4 citation statements)

References 48 publications

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“…19 As co-substitution content further increases, the exchange between Fe 3+ -O 2− -Fe 3+ decreases, meanwhile, the Co 2+ ions further occupy the spin-up sites. 23 These lead to a reduction in the net magnetic moment of the samples and therefore a tendency for 𝑀 𝑠 to decrease. The DC resistivity variation curve of Co-Zr cosubstituted hexaferrites is given in Figure 8.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the

{M}_s

parameter shows an increasing trend 19 . As co‐substitution content further increases, the exchange between Fe 3+ ‐O 2− ‐Fe 3+ decreases, meanwhile, the Co 2+ ions further occupy the spin‐up sites 23 . These lead to a reduction in the net magnetic moment of the samples and therefore a tendency for

{M}_s

to decrease.…”

Section: Resultsmentioning

confidence: 99%

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Crystal structure and magneto‐dielectric properties of Co‐Zr co‐substituted Co₂Z hexaferrites

Huo

Zhang

et al. 2023

J Am Ceram Soc.

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A series of Ba1.5Sr1.5Co2+xZrxFe24‐2xO41 hexaferrites (x = 0.00, 0.01, 0.03, 0.05, 0.07, and 0.09) were successfully prepared by the conventional solid‐state reaction method. It was found that as the Co2+ and Zr4+ ions entered the hexaferrite structure, the lattice parameters increased, whereas the relative density increased when x = 0.00‐0.03 and then decreased. A suitable amount of substitution increased the DC resistivity, reduced the magnetic and dielectric losses, and made the μ′$\mu ^{\prime}$ and ε′$\varepsilon ^{\prime}$ closer to each other. At x = 0.03, the relative density and DC resistivity of the samples reached their maxim. Besides, both the magnetic and dielectric losses were lowest within the frequency range of 10 MHz‐1 GHz. Meanwhile, the hexaferrite was impedance matched to free space, and the miniaturization factor was about 15. Therefore, this low‐loss ferrite with almost equal permeability and permittivity could be meaningful for antenna miniaturization and high‐frequency applications.

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Section: Resultsmentioning

confidence: 99%

“…Therefore, the

{M}_s

{M}_s

to decrease.…”

Section: Resultsmentioning

confidence: 99%

Crystal structure and magneto‐dielectric properties of Co‐Zr co‐substituted Co₂Z hexaferrites

Huo

Zhang

et al. 2023

J Am Ceram Soc.

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“…[9] In recent years, many metal ions have been selected for doping Co 2 Z ferrite materials to adjust their microstructure and magnetic properties, such as Zn 2+ , La 3+ , Mg 2+ , and Cu 2+ ions. [10][11][12][13] Furthermore, in many studies, ferrite was doped with Ba 3+ ions, thereby affecting its magnetic properties to a certain extent because Ba 3+ ions are non-magnetic. The magnetic properties of Co 2 Z materials predominantly originate from total magnetic moment of ferrite and superexchange interaction between magnetic ions.…”

Section: Introductionmentioning

confidence: 99%

Tuning magneto-dielectric properties of Co₂Z ferrites via Gd doping for high-frequency applications

Lü

Zhang

et al. 2023

Chinese Phys. B

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In present study, magneto-dielectric properties of Co2Z ferrite materials are tuned via Gd doping for application in high-frequency antennas and filters. Ba3Co2Fe24-xGdxO41 (x = 0.00, 0.05, 0.10, 0.15, and 0.20) materials are successfully prepared using solid-state method at 925 ℃ for 4 h with 2.5wt% Bi2O3 sintering aids. Different contents of Gd3+ ion affect micromorphology, grain size, bulk density, and magneto-dielectric properties of the ferrite. Upon increasing Gd3+ ion content, saturation magnetization (M S) first increases and then decreases. The maximum value of M S is 44.86 emu/g, which is obtained at x = 0.15. Additionally, sites occupied by Gd3+ ions can change magnetic anisotropy constant of the ferrite. Magnetocrystalline anisotropy constants (K 1) are derived from initial magnetization curve, and it is found that K 1 is related to spin–orbit coupling and intersublattice interactions between metal ions. Real part of magnetic permeability (μ') and real part of dielectric permittivity (ε') are measured in frequency range of 10 MHz–1 GHz. When x = 0.15, materials have excellent magnetodielectric properties (μ' ≈ 12.2 and ε' ≈ 17.61) as well as low magnetic loss (tanδ μ ≈ 0.03 @500 MHz) and dielectric loss (tanδ ε ≈ 0.04 @500 MHz). Results show that Gd-doped Co2Z ferrite materials have broad application prospects for use in multilayer filters and high-frequency antennas.

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“…These materials are also known for their extensive usage as permanent magnets and their high potential in microwave applications. Notably, Z-type hexaferrites exhibit strong ME coupling near RT [34][35][36] making them a good candidate for ME applications. In recent studies, the role of dynamic ME coupling in high frequency (THz) applications (induction of electromagnons via activation of electric dipoles) has been emphasized [37,38].…”

Section: Introductionmentioning

confidence: 99%

Highly tunable spin Hall magnetoresistance in room-temperature magnetoelectric multiferroic, $\text{Sr}_{3}\text{Co}_{2}\text{Fe}_{24}\text{O}_{41}|$Pt hybrids

Wagh¹,

Garg²,

Mallick³

et al. 2022

Preprint

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We present spin transport studies on a low-field, room-temperature magnetoelectric multiferroic polycrystalline Sr 3 Co 2 Fe 24 O 41 |Pt heterostructure wherein a highly tunable transverse conical magnetic phase is responsible for static and dynamic magnetoelectric coupling. We measured angular dependence of spin Hall magnetoresistance (SMR) at constant magnetic fields (H) in the range of 50 to 100 kOe. Application of field below the critical value (Hc1 ≈ 2.5 kOe), yielded negative SMR and the H-evolution of normalized SMR ((∆R/R0) × 100%) exhibited a negative gradient. Further, an increase in the H resulted in the positive slope of (∆R/R0) × 100% Vs. H and later at higher H around 14 kOe, a crossover from negative to positive SMR was observed. We employed a simple model for estimating the equilibrium magnetic configuration and computed the SMR modulation at various values of H. We argue that the tilting of the cone is dominant and in turn responsible for the observed nature of SMR below 2.5 kOe while, the closing of the cone-angle is pronounced at higher fields causing a reversal in sign of the SMR from negative to positive. Importantly, SMR experiments revealed that a change in the helicity with a reversal of the magnetic field has no influence on the observed SMR. Longitudinal spin Seebeck effect (LSSE) signal was measured to be ≈ 500 nV at 280 K, under application of thermal gradient, ∆T = 23 K and field, 60 kOe. The observed LSSE signal, originating from pure magnon spin current, showed a similar H-dependent behavior as that of the magnetization of Sr 3 Co 2 Fe 24 O 41 . Our detailed spin transport studies on polycrystalline Sr 3 Co 2 Fe 24 O 41 |Pt heterostructure demonstrate high tunability of the amplitude and the sign of the SMR, highlighting its potential for novel spintronic devices such as SMR-based spin valves and voltage-controlled spin transport devices.I.

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Spin–orbit coupling in magnetoelectric Ba₃(Zn_1−xCo_x)₂Fe₂₄O₄₁ hexaferrites

Abstract: Z-type hexaferrites Ba3(Zn1−xCox)2Fe24O41 (x = 0.2, 0.4, 0.6, 0.8, defined as Z1–Z4) were synthesized by a sol–gel method.

Cited by 16 publications

References 48 publications

Crystal structure and magneto‐dielectric properties of Co‐Zr co‐substituted Co₂Z hexaferrites

Crystal structure and magneto‐dielectric properties of Co‐Zr co‐substituted Co₂Z hexaferrites

Tuning magneto-dielectric properties of Co₂Z ferrites via Gd doping for high-frequency applications

Highly tunable spin Hall magnetoresistance in room-temperature magnetoelectric multiferroic, $\text{Sr}_{3}\text{Co}_{2}\text{Fe}_{24}\text{O}_{41}|$Pt hybrids

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Spin–orbit coupling in magnetoelectric Ba3(Zn1−xCox)2Fe24O41 hexaferrites

Abstract: Z-type hexaferrites Ba3(Zn1−xCox)2Fe24O41 (x = 0.2, 0.4, 0.6, 0.8, defined as Z1–Z4) were synthesized by a sol–gel method.

Cited by 16 publications

References 48 publications

Crystal structure and magneto‐dielectric properties of Co‐Zr co‐substituted Co2Z hexaferrites

Crystal structure and magneto‐dielectric properties of Co‐Zr co‐substituted Co2Z hexaferrites

Tuning magneto-dielectric properties of Co2Z ferrites via Gd doping for high-frequency applications

Highly tunable spin Hall magnetoresistance in room-temperature magnetoelectric multiferroic, $\text{Sr}_{3}\text{Co}_{2}\text{Fe}_{24}\text{O}_{41}|$Pt hybrids

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Spin–orbit coupling in magnetoelectric Ba₃(Zn_1−xCo_x)₂Fe₂₄O₄₁ hexaferrites

Crystal structure and magneto‐dielectric properties of Co‐Zr co‐substituted Co₂Z hexaferrites

Crystal structure and magneto‐dielectric properties of Co‐Zr co‐substituted Co₂Z hexaferrites

Tuning magneto-dielectric properties of Co₂Z ferrites via Gd doping for high-frequency applications