Influence of The Alloy Composition on The Magnetic Properties of Nanocrystalline Fe80M7B12Cu1 (M: Ti, Ta, Nb, Mo)

1999 ◽  
Vol 577 ◽  
Author(s):  
M. Kopcewicz ◽  
A. Grabias ◽  
B. Idzikowski
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Alloy Composition ◽  
Anisotropy Field ◽  
Nanocrystalline Phase ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Scanning Calorimetry ◽  
Rf Magnetic Field ◽  
Collapse Effect

ABSTRACTFormation of the nanocrystalline bcc Fe phase due to thermal treatment of the amorphous Fe80M7B12Cu1 (M: Ti, Ta, Nb, Mo) precursors is studied by the Mössbauer and differential scanning calorimetry techniques. The dependence of the formation of the bcc Fe phase on the alloy composition is discussed. In order to determine the optimal soft magnetic properties of these nanocrystalline alloys the rf-Mössbauer technique is used in which rf collapse effect induced by a radio-frequency (rf) magnetic field is employed. It was found that anisotropy fields in the nanocrystalline phase were smaller in Nb- and Mo-containing alloys as compared to the alloys which contain Ti or Ta. Variations of the anisotropy field vs. alloy composition and annealing temperature are discussed in detail.

scholarly journals SOFT MAGNETIC PROPERTIES FOR Ni-Fe-Nb ALLOY COMPOSITION FILMS

1989 ◽  
Vol 13 (S_1_PMRC_89) ◽  
pp. S1_743-748 ◽  
Author(s):  
Migaku TAKAHASHI ◽  
Hiroyuki UWAZUMI ◽  
Terunobu MIYAZAKI ◽  
Takenobu SATO ◽  
Minoru TAKAHASHI ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Alloy Composition ◽  
Soft Magnetic Properties ◽  
Soft Magnetic

Soft Magnetic Properties of [Fe80Ni20-O/NiZn-Ferrite]n Multilayer Thin Films for High Frequency Application

2014 ◽  
Vol 488-489 ◽  
pp. 174-177
Author(s):  
Rui Xu ◽  
Lai Sen Wang ◽  
Xiao Long Liu ◽  
Meng Lei ◽  
Qing Luo ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Layer Thickness ◽  
High Frequency ◽  
Anisotropy Field ◽  
Soft Magnetic Properties ◽  
Multilayer Thin Films ◽  
Insulation Layer ◽  
Soft Magnetic ◽  
Measured Resistivity

In this research, a series of [Fe80Ni20-O/NiZn-ferritn multilayer thin films with different insulation layer thickness were prepared by magnetron sputtering at room temperature. The high frequency soft magnetic properties of [Fe80Ni20-O/NiZn-ferritn multilayer thin films were investigated. It was found that the in-plane magnetic anisotropy field (Hk) and saturation magnetizations (4πMs) can be adjusted by changing the insulation layer thickness, and the optimal Hk and 4πMs can be obtained as the insulation layer thickness of 2.5 nm. The adjustment of insulation layer thickness is essential to obtain low coercivity (Hc) and high permeability (μ) of the multilayer thin films. The measured resistivity (ρ) of [Fe80Ni20-O/NiZn-ferritn multilayer thin films was increased from 211 to 448 μΩcm with increasing the insulation layer thickness.

scholarly journals Influence of Cu Content on Structure, Thermal Stability and Magnetic Properties in Fe72−xNi8Nb4CuxSi2B14 Alloys

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 726
Author(s):  
Tymon Warski ◽  
Adrian Radon ◽  
Przemyslaw Zackiewicz ◽  
Patryk Wlodarczyk ◽  
Marcin Polak ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Free Energy ◽  
Gibbs Free Energy ◽  
Cutoff Frequency ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Scanning Calorimetry ◽  
Cu Content ◽  
Iron Phase ◽  
Free Energy Of Mixing

The effect of substitution of Fe by Cu on the crystal structure and magnetic properties of Fe72−xNi8Nb4CuxSi2B14 alloys (x = 0.6, 1.1, 1.6 at.%) in the form of ribbons was investigated. The chemical composition of the materials was established on the basis of the calculated minima of thermodynamic parameters: Gibbs free energy of amorphous phase formation ΔGamorph (minimum at 0.6 at.% of Cu) and Gibbs free energy of mixing ΔGmix (minimum at 1.6 at.% of Cu). The characteristic crystallization temperatures Tx1onset and Tx1 of the alpha-iron phase together with the activation energy Ea for the as-spun samples were determined by differential scanning calorimetry (DSC) with a heating rate of 10–100 °C/min. In order to determine the optimal soft magnetic properties, the wound cores were subjected to a controlled isothermal annealing process in the temperature range of 340–640 °C for 20 min. Coercivity Hc, saturation induction Bs and core power losses at B = 1 T and frequency f = 50 Hz P10/50 were determined for all samples. Moreover, for the samples with the lowest Hc and P10/50, the magnetic losses were determined in a wider frequency range 50 Hz–400 kHz. The real and imaginary parts of the magnetic permeability µ′, µ″ along with the cut-off frequency were determined for the samples annealed at 360, 460, and 560 °C. The best soft magnetic properties (i.e., the lowest value of Hc and P10/50) were observed for samples annealed at 460 °C, with Hc = 4.88–5.69 A/m, Bs = 1.18–1.24 T, P10/50 = 0.072–0.084 W/kg, µ′ = 8350–10,630 and cutoff frequency at 8–9.3 × 104 Hz. The structural study of as-spun and annealed ribbons was carried out using X-ray diffraction (XRD) and a transmission electron microscope (TEM).

Microstructures and Magnetic Properties of Sputtered Expitaxial Co3Pt/Pt Multilayer Films

2008 ◽  
Vol 47-50 ◽  
pp. 583-587
Author(s):  
S.C. Chen ◽  
Po Cheng Kuo ◽  
Chih Long Shen ◽  
Y.H. Fang ◽  
S.L. Hsu
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Epitaxial Growth ◽  
Annealing Temperature ◽  
Perpendicular Magnetic Anisotropy ◽  
Multilayer Films ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Annealing Temperatures

Co3Pt films were deposited on Pt underlayers with various thicknesses by conventional sputtering in order to investigate the effect of Pt underlayers and annealing temperatures on their microstructure and the magnetic properties. From XRD and HRTEM analysises, as annealing at 300°C, a well epitaxial growth of Co3Pt (002) on Pt (111) underlayer that leads the film to present perpendicular magnetic anisotropy. However, Pt atoms in the Pt underlayer will diffuse seriously into Co3Pt layer as the annealing temperature is increased to 375°C that changes the compositions to approach equiatomic CoPt, and showing in-plane magnetic anisotropy with soft magnetic properties.

scholarly journals Impact of Annealing Time on the Formation of Nanocrystal in Amorphous FE75.5SI13.5CU1NB1B9 Alloy and their Ultra-Soft Magnetic Properties

2016 ◽  
Vol 40 (2) ◽  
pp. 137-145
Author(s):  
Samir Kumar Saha ◽  
Kazi Hanium Maria ◽  
Enayet Hossain ◽  
Mahabub Alam Bhuiyan ◽  
DK Saha ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Lattice Parameter ◽  
Soft Magnetic Properties ◽  
Content Increase ◽  
Soft Magnetic ◽  
Nanocrystalline State ◽  
Si Content ◽  
The Impact

To observe the impact of the annealing time on the alloy structure and ultra-soft magnetic properties of Fe75.5Si13.5Cu1Nb1B9, the alloy was annealed in a controlled way in the temperature range 475 - 600°C for different annealing time from 5 to 30 min. Amorphosity of the ribbon and nanocrystalline state was evaluated by X-ray diffraction. Grain size and Si content increase with increasing annealing temperature and time; on the other hand lattice parameter decrease with increasing annealing temperature and time. The maximum permeability was observed at annealing temperature Ta = 525°C for 15 min, and thereafter it starts to decreases. Saturation magnetization increases with annealing temperature Ta for the samples and finally decreases during annealing at a temperature much higher than peak crystallization temperature. The results of the experimental observations are explained on the basis of existing theories of nanocrystalline amorphous metallic ribbons.Journal of Bangladesh Academy of Sciences, Vol. 40, No. 2, 137-145, 2016

Effect of O2 Partial Pressure on Magnetic Properties of Alloys CoFe-Rich Nanocrystalline Thin Films

2007 ◽  
Vol 558-559 ◽  
pp. 1367-1370
Author(s):  
L.V. Tho ◽  
K.E. Lee ◽  
Cheol Gi Kim ◽  
Chong Oh Kim ◽  
W.S. Cho
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Electrical Property ◽  
Partial Pressure ◽  
Anisotropy Field ◽  
Magnetic Films ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Frequency Behavior ◽  
Nanocrystalline Thin Films

Alloys of CoFe-rich magnetic films are well known as typical soft magnetic alloys. They are used for many kinds of electric and electronic parts such as magnetic recording heads, transformers and inductors. In order to get superior soft magnetic properties of the CoFe-based nanocrystalline thin films, the effect of O2 partial pressure on magnetic properties of Co-Fe-Hf-O nanocrystalline thin films have been investigated. It is found that the soft magnetic properties and electrical property of these films show a dependence on the partial pressure of reactive gases, which presumably changes the microstructure of the films and related magnetic anisotropy. With optimal conditions, thin film exhibit excellent soft magnetic properties: saturation magnetization (4πMs) of 21 kG, magnetic coercivity (Hc) of 0.18 Oe, anisotropy field (Hk) of 49 Oe, and an electrical property is also shown to be as high as 300 μcm. The combination of high 4πMs and relatively high Hk in these films are believed to be partly responsible for the excellent ultra-high-frequency behavior

scholarly journals Effect of Cr Addition on Magnetic Properties and Corrosion Resistance of Optimized Co and Fe-Based Amorphous Alloys

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 304
Author(s):  
Jonghee Han ◽  
Jihyun Hong ◽  
Seoyeon Kwon ◽  
Haein Choi-Yim
Keyword(s):  
Magnetic Properties ◽  
Corrosion Resistance ◽  
Amorphous Alloys ◽  
Melt Spinning ◽  
Alloy System ◽  
Thermomechanical Analysis ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Scanning Calorimetry ◽  
Corrosion Properties

In the Fe-Co alloy system, the addition of Cr improves the glass-forming ability (GFA) with superior soft magnetic properties such as high saturation magnetization (Ms) and low coercivity (Hc). In addition, Cr is considered to be an important factor for improving the corrosion resistance of Fe-based amorphous alloy. Therefore, in the present study, we investigated the GFA, soft magnetic properties, and corrosion resistance of the as-spun ribbons in [Co0.075Fe0.675B0.2Si0.05]100−xCrx (x = 0–8) alloy system. The ribbons were produced using the melt-spinning technique and were characterized by X-ray diffraction, differential scanning calorimetry, thermomechanical analysis, and vibrating sample magnetometer. The Co-Fe-B-Si-Cr alloys exhibited high thermal stability and a high Ms of 0.93–1.53 T. Corrosion properties were evaluated by cyclic voltammetry. The addition of Cr improved the corrosion resistance of the alloys. The alloys with a higher Cr content exhibited a higher corrosion resistance. The optimum combination with soft magnetic properties and corrosion resistance of Fe-co based amorphous alloys can be utilized for extensive fields of application through a variation of Cr contents.

Effect of Annealing Temperature on the Soft Magnetic Properties of Fe70.43Nb10.77Si15.77Cu2.34B0.69 Amorphous Aanostrips at 20K, 300K

2021 ◽  
Vol 1035 ◽  
pp. 773-777
Author(s):  
Sheng Lei ◽  
Shuai Li ◽  
Jun Sun ◽  
Ji Xiang Zhu ◽  
Ya Feng Liu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Practical Significance ◽  
Soft Magnetic Properties ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
Magnetic Induction Intensity ◽  
Saturation Magnetic Induction ◽  
Microstructure And Magnetic Properties

Since Fe-based amorphous alloys are widely used in magnetic separators, sensors and other fields, it is of practical significance to carry out research on amorphous strips used in this field.The effects of annealing temperature on the soft magnetic properties of Fe70.43Nb10.77Si15.77Cu2.34B0.69 amorphous nanostrips with 25 μm and 28 μm thickness prepared by the single roll cold method were investigated at 20 and 300K.Five specimens were annealed at472.12K, 672.12K, 772.12K, 822.12Kand 872.12K, respectively, and their microstructure and magnetic properties were tested viametallographic microscopy, X-ray diffraction, and vibrating specimen magnetometer. At cryogenic temperatureof 20K, specimens annealed at 672,12K exhibited the best magnetic properties, including the coercive forceof8.1265A/m, saturation magnetic induction intensity of1.4351T,and its residual value of 0.2462T. The comparative analysis of experimental results obtained strongly indicates that the soft magnetic properties of the amorphous alloy are significantly improved by the particular annealing treatment.

scholarly journals Glass Forming Ability, Thermal Stability, and Magnetic Properties of FeCoNiBSi Alloys with Different B Contents

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Haibo Sun ◽  
Yongfei Wang
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Annealing Temperature ◽  
Amorphous Structure ◽  
Glass Forming Ability ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Glass Forming ◽  
Crystallization Onset ◽  
Thermal Stability Of

The dependence on the glass forming ability, magnetic property, and thermal stability of the (Fe0.39Co0.15Ni0.46)82−xB12+xSi6 (x = 0, 2, 4, and 6) alloys was investigated. The results show that the as-quenched alloy ribbons exhibit a completely amorphous structure with B content in the range of 12∼18 at.%. The initial crystallization onset temperature of the as-quenched ribbon increases with the increase of B content. When the B content is up to 14 at.%, the temperature interval between the two crystallization peaks will sharply reduce, which narrows the effective annealing range that is detrimental to improving the soft magnetic properties. Both of the Ms and Hc of the as-quenched ribbons increase first and then decrease with the increase of B content. Here, the maximum Ms of 0.90 T and low Hc of 10.2 A/m can be obtained at the B content of 14 at.%. Additionally, the (Fe0.39Co0.15Ni0.46)80B14Si6 alloy exhibits the minimum Hc of 5.9 A/m and Ms of 0.934 T at the proposed annealing temperature of 698 K for 10 min in the vacuum condition.

Fe-Cr-N Based Nanocrystalline Soft Magnetic Thin Films

1997 ◽  
Vol 475 ◽  
Author(s):  
W. Zhu ◽  
T. H. Tiefel ◽  
S. Jin ◽  
R. B. Van Dover ◽  
V. Korenivski
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Easy Axis ◽  
Anisotropy Field ◽  
Magnetic Thin Films ◽  
Film Plane ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Frequency Behavior ◽  
Post Deposition

ABSTRACTWe have investigated the soft magnetic properties of new Fe-Cr-Ta-N and Fe-Cr-Hf-N alloy films. Thin films with compositions in the range of Fe-2∼8%Cr-0∼l%Ta (or Hf)-5∼10%N (in atomic %) were prepared by reactive sputtering in a nitrogen-containing atmosphere. The films, most likely nanocrystalline, exhibit excellent soft magnetic properties in the as-deposited condition without any post-deposition heat treatment, e.g., Hc∼l-2 Oe and 4πMs∼15–20 kG. The magnetic properties are highly anisotropie in the film plane as the easy-axis M-H loop is square and the hard-axis loop is linear and closed, with the anisotropy field Ha=20–100 Oe. The films exhibit excellent high frequency behavior even in the GHz frequency range which is attributed to the combination of high 4πMs and relatively high Ha.

Sign in / Sign up

Export Citation Format

Share Document