scholarly journals Microstructure and Electromagnetic Properties of Ni-Zn-Co Ferrite up to 20 GHz

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Charalampos Stergiou
Keyword(s):  
Wall Motion ◽  
Wave Attenuation ◽  
Domain Wall Motion ◽  
Electromagnetic Properties ◽  
Complex Permeability ◽  
Microwave Dielectric ◽  
Zn Ferrite ◽  
Spin Resonance ◽  
Production Stages

The present paper examines the relation between different developed microstructures and the microwave electromagnetic properties in Ni-Zn-Co ferrite. To this end, the Ni0.25Zn0.25Co0.5Fe2O4composition has been prepared with the conventional ceramic process with varied prefiringTP(750°C, 1000°C) and sinteringTStop temperatures (1200°C, 1250°C). When lower temperatures are applied in these production stages, incomplete microstructures with low density, higher porosity, or finer grains are achieved. On account of these features, the contributions of domain wall motion and spin rotation to the complex permeabilityμ⁎(f)move to higher frequencies, whereas microwave dielectric permittivityε⁎(f)is decreased. In particular in conjunction with the high Co content, the wall relaxation and spin resonance are interestingly forced to occur at 850 MHz and 8.05 GHz, respectively. Regarding the electromagnetic wave attenuation, the ferrite annealed at lower temperatures exhibits strong return loss peaks at higher frequencies, but without other performance improvement. We should notice that the variations in sintering temperatureTSyield the maximum changes in the recorded parameters, including the coercive field,μ⁎(f),andε⁎(f), indicating the inferior role of prefiringTPin Ni-Zn ferrite.

Low Temperature Fired Ferrite/Ceramic Composite Materials and their Permeability Spectra

2010 ◽  
Vol 150-151 ◽  
pp. 293-298 ◽  
Author(s):  
Wei Wei Ling ◽  
Huai Wu Zhang ◽  
Yuan Xun Li ◽  
Ying Li Liu
Keyword(s):  
Low Temperature ◽  
Ceramic Composite ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Measured Data ◽  
Spin Rotation ◽  
Complex Permeability ◽  
Conventional Solid State Reaction ◽  
Numerical Fitting ◽  
Zn Ferrite

Ni-Cu-Zn ferrite/CaTiO3 and Ni-Cu-Zn ferrite/BaTiO3 composites which can be applied in low temperature co-fired ceramic (LTCC) technology were synthesized by conventional solid-state reaction lower than 950°C. The complex permeability spectra of the above two composites have been investigated. The contribution of spin rotation and domain wall motion to the permeability spectra was estimated by the numerical fitting of measured data to the relevant formula. Influence of two types of magnetizing processes on the permeability of different composites has been analyzed combining with the variation of microstructures.

Structural and Magnetic Properties of Low Temperature Fired Ferrite/Ceramic Composite Materials

2012 ◽  
Vol 466-467 ◽  
pp. 361-365
Author(s):  
Wei Wei Ling ◽  
Yuan Xun Li ◽  
Hai Nie ◽  
Huai Wu Zhang
Keyword(s):  
Low Temperature ◽  
Ceramic Composite ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Measured Data ◽  
Complex Permeability ◽  
Sintering Behavior ◽  
Conventional Solid State Reaction ◽  
Numerical Fitting ◽  
Mgcuzn Ferrite

MgCuZn ferrite/CaTiO3and MgCuZn ferrite/BaTiO3composites which can be applied in low temperature co-fired ceramic (LTCC) technology were synthesized by conventional solid-state reaction at 950°C. The sintering behavior and microstructures of the samples have been analyzed. The complex permeability spectra of the above two composites have been investigated. The contribution of spin rotation and domain wall motion to the permeability spectra was estimated by the numerical fitting of measured data to the relevant formula. Influence of two types of magnetizing processes on the permeability of different composites has been analyzed combining with the variation of microstructures.

scholarly journals Role of RKKY torque on domain wall motion in synthetic antiferromagnetic nanowires with opposite spin Hall angles

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
S. Krishnia ◽  
P. Sethi ◽  
W. L. Gan ◽  
F. N. Kholid ◽  
I. Purnama ◽  
...  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion

The pinning role of nonferromagnetic β phase in the domain wall motion of ferromagnetic MnAs film on GaAs(001)

2008 ◽  
Vol 103 (7) ◽  
pp. 07B106 ◽  
Author(s):  
Kwang-Su Ryu ◽  
Hun-Sung Lee ◽  
Sung-Chul Shin ◽  
Hiro Akinaga
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Β Phase

scholarly journals Role of spin diffusion in current-induced domain wall motion for disordered ferromagnets

2015 ◽  
Vol 91 (9) ◽  
Author(s):  
Collins Ashu Akosa ◽  
Won-Seok Kim ◽  
André Bisig ◽  
Mathias Kläui ◽  
Kyung-Jin Lee ◽  
...  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Spin Diffusion ◽  
Domain Wall Motion

Kinetics of polarization reversal in ferroelectric films: role of domain nucleation and domain wall motion

2004 ◽  
Vol 30 (7) ◽  
pp. 1095-1099 ◽  
Author(s):  
Igor Stolichnov ◽  
Alexander Tagantsev ◽  
Enrico Colla ◽  
Nava Setter
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Polarization Reversal ◽  
Ferroelectric Films ◽  
Kinetics Of

scholarly journals Role of Entropy in Domain Wall Motion in Thermal Gradients

2014 ◽  
Vol 113 (9) ◽  
Author(s):  
F. Schlickeiser ◽  
U. Ritzmann ◽  
D. Hinzke ◽  
U. Nowak
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Thermal Gradients

scholarly journals Monte Carlo Simulation of Magnetization Reversal Via Domain-Wall Motion in Fe Sesquilayers on W(110)

1997 ◽  
Vol 492 ◽  
Author(s):  
M. Kolesik ◽  
M. A. Novotny ◽  
Per Arne Rikvold
Keyword(s):  
Monte Carlo Simulation ◽  
Domain Wall ◽  
Ultrathin Films ◽  
Wall Motion ◽  
Domain Walls ◽  
Domain Wall Motion ◽  
Atomic Layer ◽  
Thermally Activated ◽  
Insight Into

ABSTRACTIron sesquilayers are ultrathin films with coverages between one and two atomic mono-layers. They consist of an almost defect-free monolayer with compact islands of a second atomic layer on top. This variation of the film thickness results in a strong interaction between domain walls and the island structure. It makes these systems an ideal laboratory to study the dynamics of domain walls driven by weak external fields. We present computer simulations which provide insight into the role of the thermally activated nucleation processes by which a driven domain wall overcomes the obstacles created by the islands.

scholarly journals Role of pinning in current driven domain wall motion in wires with perpendicular anisotropy

2008 ◽  
Vol 93 (17) ◽  
pp. 172513 ◽  
Author(s):  
C. Burrowes ◽  
D. Ravelosona ◽  
C. Chappert ◽  
S. Mangin ◽  
Eric E. Fullerton ◽  
...  
Keyword(s):  
Domain Wall ◽  
Wall Motion ◽  
Domain Wall Motion ◽  
Perpendicular Anisotropy
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