Magnetic Properties of Nanostructured Co-Based Alloys Produced by Dynamic Compaction and Plasma Spray Deposition

2012 ◽  
Vol 190 ◽  
pp. 192-195 ◽  
Author(s):  
L. Kuzovnikova ◽  
Elena A. Denisova ◽  
A. Kuzovnikov ◽  
Rauf S. Iskhakov ◽  
A. Lepeshev
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Plasma Spray ◽  
Spray Deposition ◽  
Anisotropy Field ◽  
Dynamic Compaction ◽  
Magnetic Characteristics ◽  
Bloch Constant ◽  
Deposition Techniques ◽  
Ferromagnetic Resonance Linewidth

The bulk nanostructured Co-P alloys were prepared by dynamic compaction and a plasma spray deposition techniques. The magnetic characteristics, such as the saturation magnetization, M0, the Bloch constant, B, the local magnetic anisotropy field, Ha, the ferromagnetic resonance linewidth, ΔH, the coercivity, Hc, were investigated. A comparison between the magnetic properties of the Co-P alloys prepared by dynamic compaction and a plasma spray deposition techniques was carried out.

scholarly journals Bulk CoNiFe-SiB Amorphous and Nanostructured Alloys Produced by Plasma Spray Deposition and Dynamic Compaction: Formation of Soft Magnetic Properties

2015 ◽  
Vol 75 ◽  
pp. 1238-1243 ◽  
Author(s):  
Elena Denisova ◽  
Ludmila Kuzovnikova ◽  
Rauf Iskhakov ◽  
Aleksandr Kuzovnikov ◽  
Anatoly Lepeshev ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Plasma Spray ◽  
Spray Deposition ◽  
Dynamic Compaction ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Nanostructured Alloys

Effect of Thickness on Mechanically Tunable Magnetic Anisotropy of FeGa Thin Films Deposited on Flexible Substrates

2015 ◽  
Vol 815 ◽  
pp. 227-232 ◽  
Author(s):  
Ying Yu ◽  
Shu Hong Xie ◽  
Qing Feng Zhan
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Effective Strain ◽  
Anisotropy Field ◽  
Saturation Field ◽  
Effective Anisotropy ◽  
Magnetostriction Constant ◽  
The Difference ◽  
Different Strains

A practical way to manipulate the magnetic anisotropy of magnetostrictive FeGa thin films grown on flexible polyethylene terephthalate (PET) substrates is introduced in this study. The effect of film thickness on magnetic properties and magnetostriction constant of polycrystalline FeGa thin films was investigated. The anisotropy field Hk of flexible FeGa films, i.e., the saturation field determined by fitting the hysteresis curves measured along the hard axis, was enhanced with increasing the tensile strain applied along the easy axis of the thin films, but this enhancement via strain became unconspicuous with increasing the thickness of FeGa films. In order to study the magnetic sensitivity of thin films responding to the external stress, we applied different strains on these films and measure the corresponding anisotropy field. Moreover, the effective magnetostriction constant of FeGa films was calculated from the changes of both anisotropy field and external strain based on the Villari effect. A Neel’s phenomenological model was developed to illustrate that the effective anisotropy field of FeGa thin films was contributed from both the constant volume term and the inverse thickness dependent surface term. Therefore, the magnetic properties for the volume and surface of FeGa thin films were different, which has been verified in this work by using vibrating sample magnetometer (VSM) and magneto-optic Kerr effect (MOKE) system. The anisotropy field contributed by the surface of FeGa film and obtained by MOKE is smaller than that contributed by the film volume and measured by VSM. We ascribed the difference in Hk to the relaxation of the effective strain applied on the films with increasing the thickness of films.

PHASE EVOLUTION AND MAGNETIC PROPERTIES OF TbCu7-TYPE (Sm, Pr)Co7-xHfxMy (x = 0-0.5; y = 0-0.14) RIBBONS

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1663-1669 ◽  
Author(s):  
H. W. Chang ◽  
S. T. Huang ◽  
I. W. Chen ◽  
C. W. Chang ◽  
W. C. Chang
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Exchange Coupling ◽  
Coupling Effect ◽  
Anisotropy Field ◽  
Phase Evolution ◽  
Phase Constitution ◽  
Melt Spun

The effects of Hf substitution and C content on the magnetic properties, phase evolution, and microstructure of melt spun ( Sm , Pr ) Co 7- x Hf x C y ( x = 0-0.5; y = 0-0.14) ribbons have been studied. A proper Hf substitution is helpful not only in stabilizing 1:7 phase but also in enhancing its magnetic anisotropy field. As a result, magnetic properties of B r = 6.4 kG , i H c = 7.3 kOe and ( BH ) max = 8.7 MGOe for SmCo 6.9 Hf 0.1 ribbons are obtained. Besides, a small amount of C addition in the ribbons could slightly modify phase constitution and effectively refine their microstructure to strengthen the exchange coupling effect between magnetic grains. Furthermore, a slight Pr substitution for Sm may further increase the magnetization and the magnetic properties of the ribbons. The optimal magnetic properties of B r = 7.1 kG , i H c = 8.5 kOe and ( BH ) max = 11.2 MGOe could be achieved for the directly quenched Sm 0.8 Pr 0.2 Co 6.9 Hf 0.1 C 0.12 ribbons.

scholarly journals Температурная зависимость эффективного поля магнитной анизотропии и ширины линии ферромагнитного резонанса поликристаллических сложнозамещенных гексагональных магнитноодноосных ферритов в диапазоне частот 25-67 GHz

2020 ◽  
Vol 90 (5) ◽  
pp. 782
Author(s):  
С.В. Щербаков ◽  
А.Г. Налогин ◽  
В.Г. Костишин ◽  
А.С. Семенов ◽  
Н.Е. Адиатулина ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Ferromagnetic Resonance ◽  
Barium Hexaferrite ◽  
Anisotropy Field ◽  
Ceramic Technology ◽  
Strontium Hexaferrite ◽  
Temperature Changes ◽  
Temperature Range ◽  
Resonance Linewidth ◽  
Ferromagnetic Resonance Linewidth

In the work in the frequency range 25 – 67 GHz the temperature changes of the effective magnetic anisotropy field and ferromagnetic resonance linewidth of the samples isotropic and anisotropic hexaferrite SrFe11.2Al0.1Si0.15Ca0.15O19 and anisotropic hexaferrite BaFe10.4Al1.4Si0.15Mn0.1O19 were studied. The samples obtained by ceramic technology with the pressing of the raw blanks in a magnetic field of 10 kOe. The studies were carried out in the temperature range+25 – +85 ºC. It was found that in the specified temperature range, the change in magnetic anisotropy is 9.8 Oe/ºC for barium hexaferrite and 4.2 Oe/ºC for strontium hexaferrite, and the change in ferromagnetic resonance linewidth is 12.2 Oe/ºC for barium hexaferrite and 10 – 12.3 Oe/ºC for strontium hexaferrite.

HIGH MAGNETIC PROPERTIES OF TbCu7-TYPE MELT SPUN (Sm, Pr)Co7-xHfxCy RIBBONS

2008 ◽  
Vol 01 (03) ◽  
pp. 183-187 ◽  
Author(s):  
H. W. CHANG ◽  
S. T. HUANG ◽  
I. W. CHEN ◽  
C. W. CHANG ◽  
W. C. CHANG
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Exchange Coupling ◽  
Coupling Effect ◽  
Anisotropy Field ◽  
Phase Evolution ◽  
Phase Constitution ◽  
Melt Spun

The effects of Hf substitution and C content on the magnetic properties, phase evolution and microstructure of melt spun ( Sm , Pr ) Co 7-x Hf x C y (x = 0–0.5; y = 0–0.14) ribbons have been studied. A proper Hf substitution is helpful not only in stabilizing 1:7 phase but also in enhancing its magnetic anisotropy field, as a result, magnetic properties of B r = 6.4 kG , i H c = 7.3 kOe and (BH) max = 8.7 MGOe for SmCo 6.9 Hf 0.1 ribbons are obtained. Besides, a small amount of C addition in the ribbons could slightly modify phase constitution and effectively refine their microstructure to strengthen the exchange coupling effect between magnetic grains. It leads to the improvement of the magnetic properties for SmCo 6.8 Hf 0.2 C 0.12 nanocomposites. Finally, a slight Pr substitution for Sm may further increase the magnetization and the magnetic properties, the optimal magnetic properties of B r = 7.1 kG , i H c = 8.5 kOe and (BH) max = 11.2 MGOe could be achieved for the directly quenched Sm 0.8 Pr 0.2 Co 6.9 Hf 0.1 C 0.12 ribbons.

scholarly journals Magnetic properties of hexaferrite nanosized powders produced via mechanoactivation

2005 ◽  
Vol 37 (2) ◽  
pp. 107-114 ◽  
Author(s):  
E.P. Naiden ◽  
R.A. Zhuravlyov ◽  
V.I. Itin ◽  
O.G. Terekhova ◽  
M.V. Politov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Saturation Magnetization ◽  
Size Effects ◽  
Magnetic Phase ◽  
Structural Parameters ◽  
Magnetic Characteristics ◽  
Nanosized Powders ◽  
Similar Materials ◽  
The Relationship

A study of the relationship between structural parameters and principal magnetic characteristics of nanosized powders of hexagonal ferrimagnetics produced via mechanoactivation has been carried out. The models describing the influence of the size effects on temperatures of magnetic phase transformations, saturation magnetization and magnetic anisotropy of similar materials are discussed.

Magnetic Characteristics of RCo7−xZrx Alloys (invited) (R = Sm, Pr, Er, Gd, and Y)

1999 ◽  
Vol 577 ◽  
Author(s):  
M.Q. Huang ◽  
W.E. Wallace ◽  
M.E. Mchenry ◽  
S.G. Sankar ◽  
Qun Chen ◽  
...  
Keyword(s):  
Phase Transition ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Magnetic Moments ◽  
Anisotropy Field ◽  
Experimental Results ◽  
Magnetic Characteristics ◽  
Treatment Conditions ◽  
Experimental Values ◽  
Co Alloys

ABSTRACTA brief review is presented of recent work dealing with the structure and magnetic properties of RCo7−x Zrx alloys (R=Sm, Pr, Er, Gd, and Y). The experimental results obtained are consistent with a model in which Zr atoms partly replace dumbbell Co atoms and play an important role in stabilizing the TbCu7 structure while significantly increasing the anisotropy field (HA). For example, when R=Sm, HA increases from 90 kOe for x=O to 130 kOe for x=0.2 at 300 K, and from 140 kOe for x=0 to 220 kOe for x=0.2 at 10 K. In the case of R=Y and Gd, HA is mainly contributed by the Co sublattice. For R=Y alloys, HA increases from 18 kOe for x=0 to 74 kOe for x=0.2 at 300 K and from 20 kOe for x=0 to 82 kOe for x=0.2 at 10 K. For R=Gd alloys, HA shows the largest enhancement. It increases from 35 kOe for x=0 to 140 kOe for x=0.2 at 300 K and from planar for x=0 to uniaxial with 182 kOe for x=0.2 at 10 K. In general, experimental results are in accord with the theory of Greedan and Rao for anisotropies of R-Co alloys. The magnetic moments for cobalt and rare earth in RCo7−xrx compounds (x=0∼A).2) have been estimated from the experimental values. The results show that they are nearly the same as those in RCo5 or R2Co17. The Co moment is 1.5∼;1.6 μB. Some phase transition phenomenon between RCo5, RCo7, R2Co17and R2Co7at different heat treatment conditions will also be discussed.

Improvement of microwave magnetic properties by inserting nonmagnetic layer

2017 ◽  
Vol 31 (02) ◽  
pp. 1750004
Author(s):  
Xiaoting Li ◽  
Chao An ◽  
Zhen Wang ◽  
Chunlong Xu ◽  
Gang Shi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Resonance Frequency ◽  
Exchange Coupling ◽  
Sandwich Structure ◽  
Anisotropy Field ◽  
Interface Energy ◽  
Coupling Energy ◽  
Radio Frequency Sputtering ◽  
Nonmagnetic Layer

Co/NM (nonmagnetic Ag and SiO2)/Co sandwich structure films with different thicknesses of NM were fabricated on Si(111) substrate via oblique radio frequency sputtering. With increasing thickness of nonmagnetic Ag [Formula: see text], in-plane magnetic anisotropy field [Formula: see text] initially increased from 100 Oe of [Formula: see text] nm to 220 Oe of [Formula: see text] nm, and then decreased when [Formula: see text] nm. Resonance frequency showed the same tendency with maximum 5.2 GHz when [Formula: see text] nm. Damp factor increased from 0.02 for [Formula: see text] for [Formula: see text] nm. The same result was observed in inserting oxide nonmagnetic SiO2 layer. This can be attributed to the competition between interface energy and exchange coupling energy.

Magnetic Properties of Sputtered Ni/Al Multilayers

1991 ◽  
Vol 231 ◽  
Author(s):  
E. Tsang ◽  
J. C. Cates ◽  
M. Tan ◽  
A. Waknis ◽  
C. Alexander ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Layer Thickness ◽  
Hysteresis Loops ◽  
Anisotropy Field ◽  
Magnetic Characteristics ◽  
Phase System ◽  
Perpendicular Anisotropy ◽  
Two Phase ◽  
Pass Through ◽  
The Individual

AbstractMagnetic properties of sputtered Ni/Al multilayers have been investigated by vibrating sample magnetometry and ferromagnetic resonance. In these compositionally modulated films (CMFs) the Al ‘spacer’ layer thickness was fixed at 3.5 nm while the total Ni content of each film was held constant at 308 nm. The thickness of the individual Ni layers was varied from 4.8 to 154 nm. The CMFs showed a variety of magnetic characteristics which were dependent on the thickness of the Ni layers. CMFs with Ni layer thickness 30 nm and above showed clear evidence of perpendicular anisotropy. This anisotropy is characterized by low-remanence perpendicular hysteresis loops of the type commonly found in CoCr alloy films. As the Ni layer thickness diminishes the perpendicular anisotropy decreases and is eventually lost. Simultaneously, the CMFs show increasing in-plane remanence, rising to a peak squareness of greater than 0.5 at a Ni layer thickness of 11 nm. As the Ni thickness continues to decrease, the remanence again declines. At Ni thicknesses of a few nm the CMFs become quasi-superparamagnetic. These CMFs do not show a monotonic reduction in saturation magnetization, Ms, with decreasing Ni layer thickness. Instead, both Ms and the coercivity, Hc, pass through a maximum in the region of 40–80 nm Ni layer thickness. FMR measurements were also made on these films. A plot of the effective anisotropy field produces data of a similar form to the Ms versus Ni layer thickness plot, again with a clear maximum. The FMR data also reveals interesting resonances in the films exhibiting perpendicular anisotropy. The presence of satellite resonances adjacent to the principal resonance peaks seems to suggest, in structural terms, a two-phase system as the basis of the observed anisotropy.

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