Control of Coercivity and Magnetic Anisotropy Through Cobalt Substitution in Ni-Zn Ferrite

2021 ◽  
Author(s):  
J. N. Pavan Kumar Chintala ◽  
M. Chaitanya Varma ◽  
G. S. V. R. K. Choudary ◽  
K. H. Rao
Keyword(s):  
Magnetic Anisotropy ◽  
Cobalt Substitution ◽  
Zn Ferrite

Study on stress testing of ferromagnetic materials based on magnetic anisotropy

2022 ◽  
Vol 64 (1) ◽  
pp. 45-49
Author(s):  
Ruilei Zhang ◽  
Ziyang Gong ◽  
Zhongchao Qiu ◽  
Yuntian Teng ◽  
Zhe Wang
Keyword(s):  
Magnetic Anisotropy ◽  
Stress Testing ◽  
Processing System ◽  
Ferromagnetic Materials ◽  
Testing System ◽  
Destructive Testing ◽  
Signal Processing System ◽  
System A ◽  
Zn Ferrite ◽  
Testing Experiment

The stress testing and evaluation of ferromagnetic materials that are widely applied in engineering has always been a focus of, and presented difficulties for, non-destructive testing. As there is still no effective method for detecting the stress of ferromagnetic materials, this paper puts forward the idea of applying the magnetic anisotropy method based on the inverse magnetostriction effect in stress testing of ferromagnetic materials. According to the principle of the magnetic anisotropy method, this paper discusses the development of Mn-Zn ferrite probes of three different structures, the construction of a magnetic anisotropy testing system comprising an excitation system, a signal collecting system and a signal processing system and the way in which a testing experiment was conducted on a 16MnR steel plate specimen under different conditions of stress, frequency and excitation voltage. All three types of probe can effectively determine the stress location of the specimen and present different phenomena and characteristics of the test. According to the experiment, significant correlation is seen between the stress and the magnetic signal, which provides a new idea for stress testing of ferromagnetic materials.

Magnetic, structural and dc electrical resistivity studies on the divalent cobalt substituted Ni–Zn ferrite system

2015 ◽  
Vol 29 (12) ◽  
pp. 1550067 ◽  
Author(s):  
M. Siva Ram Prasad ◽  
B. B. V. S. V. Prasad ◽  
B. Rajesh Babu
Keyword(s):  
Activation Energy ◽  
Grain Size ◽  
Electrical Resistivity ◽  
Lattice Constant ◽  
Room Temperature ◽  
Error Function ◽  
Positive Contribution ◽  
Dc Electrical Resistivity ◽  
Cobalt Substitution ◽  
Zn Ferrite

Polycrystalline cobalt substituted Ni – Zn ferrite with composition Ni 0.65-x Co x Zn 0.35 Fe 2 O 4(x = 0.00–0.25 insteps of 0.05) have been prepared through the conventional solid state ceramic method. Calcination and sintering have been performed in air atmosphere at 950°C and 1250°C for 4 h and 2 h, respectively followed by natural cooling to room temperature. X-ray diffraction patterns of all samples indicated the formation of the single spinel structure and the accurate lattice parameter for each composition has been determined using the Nelson–Riley error function. The increase in lattice constant on cobalt substitution is attributed to the ionic radius difference between the displaced and the substituted ion. The variation in lattice constant on incorporation of Co 2+ ion indicates its solubility into the spinel lattice and noticeable modification in structural properties have been observed. The observed increase in the saturation magnetization and Curie temperature with the increase in the Co 2+ substitution is due to its higher magnetic moment compared to that of Ni 2+, improvement in the A–B exchange interaction mechanism and large positive contribution to magnetic anisotropy due to presence of Co 2+ when they are at the octahedral sites. The observed variation in the initial magnetic permeability and the magnetic loss factor with cobalt substitution measured at a low frequency of 1 KHz have been attributed to the modification in the density, porosity, grain size and anisotropy contributions. A nearly comparable variation is observed in the room temperature dc electrical resistivity and activation energy for conduction and is attributed to the modification in structure, role and nature of cobalt ions and the microstructure aspects like grain size and pore concentration. The activation energy values in the range of 0.28 to 0.36 eV suggest a possible electron hopping. The observed changes in the structural and the magnetic and electrical properties have all been discussed in the light of exiting understanding.

scholarly journals Ni-Zn Ferrite with Graded Magnetic Anisotropy for High Frequency Applications.

1998 ◽  
Vol 45 (3) ◽  
pp. 248-252
Author(s):  
Nobuyuki Hiratsuka ◽  
Yohei Nakamura ◽  
Koichi Kakizaki ◽  
Hidehiko Kobayashi
Keyword(s):  
Magnetic Anisotropy ◽  
High Frequency ◽  
Zn Ferrite

scholarly journals Co2+ Substituted Spinel MgCuZn Ferrimagnetic Oxide: A Highly Versatile Electromagnetic Material via a Facile Molten Salt Route

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2333
Author(s):  
Lankeshwar M. Thorat ◽  
Digambar Y. Nadargi ◽  
Mohaseen S. Tamboli ◽  
Abdullah M. Al-Enizi ◽  
Rahul C. Kambale ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Dielectric Loss ◽  
Molten Salt ◽  
Interfacial Polarization ◽  
Electromagnetic Properties ◽  
Molten Salt Synthesis ◽  
High Coercivity ◽  
Tem Analysis ◽  
Cobalt Substitution ◽  
Zn Ferrite

We report on the electromagnetic properties of Co2+ substituted spinel MgCuZn ferrites developed via a facile molten salt synthesis (MSS) route. The choice of synthesis route in combination with cobalt substitution led to strong electromagnetic properties such as high saturation magnetization (i.e., 63 emu/g), high coercivity (17.86 gauss), and high initial permeability (2730), which are beneficial for the multilayer chip inductor (MLCI) application. In a typical process, the planned ferrites were synthesized at 800 °C using sodium chloride as a growth inhibitor, with dense morphology and irregularity in the monolithicity of the grains. The compositional analysis of as-prepared ferrite confirms the presence of desired elements with their proportion. The crystallite size (using X-ray diffraction (XRD) analysis) for different samples varies in the range of 49–51 nm. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis showcases the compact morphology of the developed samples, which is typical in the ferrite system. The dielectric properties (dielectric-loss and dielectric-constant) in the frequency range of 100Hz–1MHz suggest normal dielectric distribution according to interfacial polarization from Maxwell–Wagner. From the developed ferrites, upon comparison with a low dielectric loss with high permeability value, Mg-Cu-Zn ferrite with Co = 0.05 substitution proved to be a stronger material for MLCIs with high-performance applications.

TEM Study of Co/Pd and Co/Au Multilayers

1993 ◽  
Vol 51 ◽  
pp. 1036-1037
Author(s):  
A.E.M. De Veirman ◽  
F.J.G. Hakkens ◽  
W.M.J. Coene ◽  
F.J.A. den Broeder
Keyword(s):  
Magnetic Anisotropy ◽  
Ion Beam ◽  
Perpendicular Magnetic Anisotropy ◽  
Optical Recording ◽  
Magnetic Multilayer ◽  
Ion Beam Sputtering ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Beam Sputtering ◽  
Substrate Temperatures

There is currently great interest in magnetic multilayer (ML) thin films (see e.g.), because they display some interesting magnetic properties. Co/Pd and Co/Au ML systems exhibit perpendicular magnetic anisotropy below certain Co layer thicknesses, which makes them candidates for applications in the field of magneto-optical recording. It has been found that the magnetic anisotropy of a particular system strongly depends on the preparation method (vapour deposition, sputtering, ion beam sputtering) as well as on the substrate, underlayer and deposition temperature. In order to get a better understanding of the correlation between microstructure and properties a thorough cross-sectional transmission electron microscopy (XTEM) study of vapour deposited Co/Pd and Co/Au (111) MLs was undertaken (for more detailed results see ref.).The Co/Pd films (with fixed Pd thickness of 2.2 nm) were deposited on mica substrates at substrate temperatures Ts of 20°C and 200°C, after prior deposition of a 100 nm Pd underlayer at 450°C.

MAGNETIC ANISOTROPY IN NICKEL AND IRON ; THE EFFECT OF PRESSURE

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-186-C1-192 ◽  
Author(s):  
J. J. M. FRANSE
Keyword(s):  
Magnetic Anisotropy ◽  
Effect Of Pressure

THE MAGNETIC ANISOTROPY OF Ni AND THE MEAN FREE PATH OF THE ELECTRONS

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-539-C1-540 ◽  
Author(s):  
K. HAUSMANN ◽  
M. WOLF
Keyword(s):  
Magnetic Anisotropy ◽  
Free Path ◽  
Mean Free Path ◽  
The Mean

STRUCTURAL RELAXATION AND ATOMIC MOBILITY BY MAGNETIC ANISOTROPY MEASUREMENTS IN SOME METALLIC GLASSES

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-511-C5-516 ◽  
Author(s):  
W. Chambron ◽  
A. Chamberod
Keyword(s):  
Magnetic Anisotropy ◽  
Metallic Glasses ◽  
Structural Relaxation ◽  
Atomic Mobility

MAGNETIC ANISOTROPY OF CARBON DOPED Nd2Fe14B

1985 ◽  
Vol 46 (C6) ◽  
pp. C6-305-C6-308 ◽  
Author(s):  
F. Bolzoni ◽  
F. Leccabue ◽  
L. Pareti ◽  
J. L. Sanchez
Keyword(s):  
Magnetic Anisotropy ◽  
Carbon Doped
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