Investigation on magnetoelectric and dielectric properties of Co0.9Mn0.3Fe1.8O4–Sr0.5Ba0.5Nb2O6 composites

Wang

J Mater Sci: Mater Electron

2015

Multi functional composite materials based on BaZn 2 Fe 16 O 27 (BZF) ferrite and antimony-doped tin oxide (the mole ratio of Sb/Sn is 1:5) composite were prepared by co-precipitation method. The structure, morphology, and property of the composites are characterized using X-ray diffraction, scanning electron microscopy, UV-visible spectroscopy, and a network analyzer. The results showed that nano ATO particles were formed on the surface of flake ferrite. Upon the addition of ATO particles, the complex permittivity of the BZF/ATO composites increases, while the complex permeability of the BZF/ATO composites increases firstly, and then decreases. The reflection loss varies with the change of the BZF/ATO mole ratio, even more the reflection loss peak changes. At 2.7 mm thickness, the reflection loss of the BZF/ATO composites with a mole ratio of 1:1 reaches the maximum value -58.91 dB at 8.08 GHz, and the bandwidth over an absorptivity of 90 % (-10 dB reflection loss) is 9.28 GHz (ranging from 6.32 to 15.6 GHz). The 1.06 lm laser reflection of BZF/ATO composites decreases to a minimum 4.662 %, when the mole ratio of BZF/ATO is 2:1.

Section: Introductionmentioning

confidence: 99%

A composite material based on BaZn2Fe16O27 ferrite and antimony-doped tin oxide composite with excellent microwave absorbing property and 1.06 μm reflection performance

Wang

J Mater Sci: Mater Electron

2015

“…The Mc is expected to be negative or positive, which depends on the nature of the composite. If magnetoelectric coupling is more dominant in the composite, then magnetocapacitance is negative [14,15].…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectric and magnetodielectric properties of LSMO–(BCT–BZT) composites

Mane¹,

Tarale

Chavan³

et al. 2015

Indian J Phys

The present paper reports magnetoelectric and magnetodielectric properties of La 0.67 Sr 0.33 MnO 3 and (Ba 0.7 Ca 0.3 TiO 3 )-(BaZr 0.2 Ti 0.8 O 3 ) composites. y(La 0.67 Sr 0.33 MnO 3 ) ? (1 -y)[x(Ba 0.7 Ca 0.3 TiO 3 )-(1 -x)(BaZr 0.2-Ti 0.8 O 3 )] particulate composites are prepared for x = 0.40, 0.45, and 0.50 and for y = 0.1 and 0.175. Ferroelectric compositions [x(Ba 0.7 Ca 0.3 TiO 3 )-(1 -x)(BaZr 0.2 Ti 0.8 O 3 )] are synthesized via ceramic route, while La 0.67 Sr 0.33 MnO 3 is synthesized via hydroxide co-precipitation route. Composites of La 0.67 Sr 0.33 MnO 3 and (Ba 0.7 Ca 0.3 TiO 3 )-(BaZr 0.2 Ti 0.8 O 3 ) are synthesized using ceramic method. The crystal structures of La 0.67 Sr 0.33 MnO 3 , [x(Ba 0.7 Ca 0.3 TiO 3 )-(1 -x)(BaZr 0.2-Ti 0.8 O 3 )], and composites are investigated using X-ray diffractograms, while microstructures are investigated using scanning electron microscope. The dielectric properties of [x(Ba 0.7 Ca 0.3 TiO 3 )-(1 -x)(BaZr 0.2 Ti 0.8 O 3 )] are determined as a function of temperature between 30 and 150°C and at frequencies 1, 10, 100 kHz, and 1 MHz. The investigations on P-E hysteresis loops of [x(Ba 0.7 Ca 0.3 TiO 3 )-(1 -x)(BaZr 0.2 Ti 0.8 O 3 )] show useful values of maximum polarization (P max ) and remanent polarization (P r ). Dielectric study on composites is carried out as a function of frequencies between 1 kHz and 1 MHz and for magnetic field between 0 and 6 KOe. The linear magnetoelectric coefficient ''a'' and quadratic magnetoelectric coefficient ''b'' are measured with the help of custom-designed setup. The results on magnetoelectric and magnetodielectric properties of composites are interesting.

J Mater Sci: Mater Electron

“…(1), several methods have been extensively studied to concurrently obtain high saturation magnetization (4pM s ) and appropriate anisotropic field (H k ) in order to fabricate thin films with high f r . However, monolayer thin films used in high frequency applications must have high electrical resistivity to suppress the eddy current loss and improve the electromagnetic matching to remove the stub effect [4,5], and the monolayer has some disadvantages such as narrow absorption band, the microwave absorbent based on Fe-based magnetic materials becomes a new direction [6,7]. Thus, the next efforts have to focus on the preparation of soft magnetic films by feeding oxygen to improve the high-frequency magnetic properties and the resistivity without significantly decreasing the saturation magnetization.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic and microwave properties of NiFe/NiFeO multilayer thin films

Dai

Ren

et al. 2015

In this work, [NiFe/NiFeO] 10 multilayer thin films were fabricated by magnetron sputtering. The microwave and electromagnetic properties were investigated for different thicknesses, t, of the NiFeO layer (t = 0-6 nm) while the thickness of the NiFe was maintained at 8 nm in every cycle. A clear in-plane uniaxial anisotropy field was induced by an external magnetic field. The in-plane uniaxial anisotropy can be adjusted by tailoring the thickness of the NiFeO layer. When t = 0 nm, the NiFe monolayer, which has a thickness of 80 nm, showed low resistivity (q) and ferromagnetic resonance frequency (f r ). By increasing the t from 0 to 6 nm, the q of the [NiFe/NiFeO] 10 films exhibited a significant monotonic increase (from 111.2 to 268.8 lX cm), the f r rose from 1.07 to 2.85 GHz, and the saturation magnetization (4pM s ) was decreased from 12.7 to 10.8 kG. The real part (l 0 ) of the complex permeability is larger than 100 in the range 0.2-1.9 GHz and the damping coefficient (a eff ) increases to 0.078 for t = 6 nm.