Effect of Cooling Rate on Magnetic Properties, Size and Type of Structural Defects in the Volume of Bulk Amorphous Fe36Co36B19Si5Nn4 Alloy in the Form of Rods of Various Diameters

2014 ◽  
Vol 59 (1) ◽  
pp. 263-268 ◽  
Author(s):  
M. Nabiałek ◽  
A. Dobrzanska-Danikiewicz ◽  
S. Lesz ◽  
P. Pietrusiewicz ◽  
M. Szota ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Liquid Alloy ◽  
Magnetization Curve ◽  
Amorphous State ◽  
Structural Defects ◽  
Initial Magnetization ◽  
Type Size ◽  
Solidification Speed ◽  
Determining Factor ◽  
Magnetization Behavior

Abstract This paper presents the results of microstructure and magnetic properties analysis for bulk amorphous samples of Fe36Co36B19Si5Nb4 alloy in the form of rods of 1 mm, 2 mm, and 3 mm diameters in the as-cast state, produced using the method of injecting liquid alloy into cooled copper mold. The main purpose of the research was to examine the effect of solidification speed of the liquid material into amorphous state on the shape of initial magnetization curve as well as to determine the type and size of structural defects occurring in the volume of the material. In order to achieve these objectives, the magnetization measurements were carried out, which according to H. Kronmüller’s theory on magnetization behavior near the area called reaching the ferromagnetic saturation, allow to determine the type, size, and surface density of structural defects occurring in the volume of the sample. The analysis of reduced magnetization curves indicates that solidification speed of the liquid alloy into the amorphous state is the main determining factor for the shape of initial magnetization curve and for the type and size of structural defects formed in the sample, which affects such magnetic parameters as: coercive field (HC) or saturation magnetization (MS).

scholarly journals The Structural Relaxation and its Influence on High Field Magnetization Processes

2014 ◽  
Vol 59 (2) ◽  
pp. 659-662 ◽  
Author(s):  
P. Pietrusiewicz ◽  
M. Nabiałek ◽  
M. Szota ◽  
M. Dośpiał ◽  
K. Błoch ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetization Curve ◽  
Structural Investigation ◽  
Hysteresis Loops ◽  
Amorphous Structure ◽  
Structural Defects ◽  
Initial Magnetization ◽  
High Field Magnetization ◽  
Magnetic Investigation ◽  
Magnetization Processes

Abstract In this paper the results of the structural and magnetic investigation of Fe61Co10Y8Zr1B20 alloy after solidification and isothermal annealing was presented. The isothermical annealing was carried out at 700 K for 1 h and 770 K for 3.5 h. For the structural investigation was performed by X-ray diffractometer equipped with a copper lamp. The results of (XRD) measurements showed the material in the state after the solidification and heat treatment is amorphous. Static hysteresis loops and initial magnetization curve was measured using vibrating magnetometer (VSM). The quality and quantity of structural defects in the sample after heat treatment was determined by indirect method using analyze the initial magnetization curve in accordance with the theory of Kronmüllera. These studies have shown that the annealing process has big influence to change significantly quantity of defects in amorphous structure as a result, there are changes of magnetic parameters such as saturation magnetization and field μ0Ms coercivity Hc.

Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

2020 ◽  
Vol 16 (4) ◽  
pp. 655-666
Author(s):  
Mona Rekaby
Keyword(s):  
Magnetic Properties ◽  
Zno Nanoparticles ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Structural Defects ◽  
Ferromagnetic Behavior ◽  
Secondary Phases ◽  
Antiferromagnetic Ordering ◽  
Doped Zno ◽  
Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

scholarly journals Effect of Small Addition of Cobalt on Magnetic Properties and Internal Stresses Sources in the Form of Free Volumes and Pseudo-Dislocation Dipoles in Fe78CoXSi11-XB11 (x = 0 Or 2) Alloys / Wpływ Nieznacznego Dodatku Kobaltu Na Właściwości Magnetyczne Oraz Źródła Naprężeń Wewnętrznych W Postaci Wolnych Objętości Oraz Pseudodyslokacyjnych Dipoli W Stopach Fe78CoXSi11-XB11 (x = 0 Or 2)

2015 ◽  
Vol 60 (4) ◽  
pp. 3095-3100 ◽  
Author(s):  
M. Szota
Keyword(s):  
Magnetic Properties ◽  
Amorphous Materials ◽  
Amorphous Structure ◽  
Small Addition ◽  
Structural Defects ◽  
Internal Stresses ◽  
Structure Defects ◽  
Alloy Addition ◽  
Application Potential ◽  
Technical Industry

Amorphous materials in the form of tapes, despite being discovered more than half a century ago, are still the object of interest for materials engineers and electro-technical industry. They possess a great application potential, and are constantly studied for new variations. Due to the different structure from the commonly manufactured textured FeSi sheets, FeCoB based amorphous alloys demonstrate very good, so called soft magnetic properties. This paper presents the results of studying the structure and magnetic properties of tapes of Fe78CoxSi11-xB11(X = 0 or 2) alloys of amorphous structure. In addition, the effect of Co alloy addition on the type of structural defects in the area of ferromagnetic saturation approach was examined. It was found that a small addition of Co affects the increase of saturation magnetization value, as well as the distribution of magnetization vectors within the stresses sources in form of structure defects.

Comparative High-Field Magnetization Study of (Sm,Er)2Fe17 and Er2Fe17 Compounds and their Nitrides

2021 ◽  
Vol 1037 ◽  
pp. 148-153
Author(s):  
Lev Aleksandrovich Ivanov ◽  
Michael Paukov ◽  
Irina Tereshina ◽  
Svetlana Veselova ◽  
Olga V. Akimova ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
High Field ◽  
Mechanical Grinding ◽  
Field Magnetization ◽  
High Field Magnetization ◽  
Magnetization Data ◽  
Powder Samples ◽  
Magnetization Behavior ◽  
Grinding Time

Magnetic properties of the R2Fe17 compounds are sensitive to the atomic substitutions and interstitial absorption of nitrogen. In our work, both were combined and their effect on the magnetization behavior of Er2Fe17 compound in magnetic fields up to 58 T was studied. Er2Fe17N2, Sm1.2Er0.8Fe17N2 and Sm1.8Er0.2Fe17N2.1 nitrides were prepared. Magnetization measurements were carried out, mainly on powder samples (excluding Er2Fe17 single crystal). Nanopowders of Sm1.2Er0.8Fe17N2 were obtained by mechanical grinding. The grinding time was varied from 0 to 60 minutes. The strength of the inter-sublattice coupling in samples is estimated by analyzing high-field magnetization data.

Effect of structural defects and S-doped on electronic structure and magnetic properties of HfSe2 monolayer

2019 ◽  
Vol 479 ◽  
pp. 192-198 ◽  
Author(s):  
Xu Zhao ◽  
Yonghui Gao ◽  
Hui Zhang ◽  
Haiyang Wang ◽  
Tianxing Wang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Structural Defects

Influences of the Adding Manners of b on the Stability and the Soft Magnetic Properties of Amorphous Fe52Co34Hf7B6Cu1 Alloys

2013 ◽  
Vol 320 ◽  
pp. 83-87 ◽  
Author(s):  
Yue Gu ◽  
Yue Sheng Chao
Keyword(s):  
Activation Energy ◽  
Magnetic Properties ◽  
Amorphous State ◽  
Soft Magnetic Property ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Transmission Electron ◽  
The Matrix ◽  
Quenching Method ◽  
The Stability

The stability and the soft magnetic properties of amorphous Fe52Co34Hf7B6Cu1 alloys have been investigated in this paper. Amorphous Fe52Co34Hf7B6Cu1 alloys ribbons are prepared by single-roller-quenching method. The differential thermal analysis (DTA), X-ray diffraction (XRD), Mössbauer Spectroscopy, transmission electron microscope (TEM) and vibrating sample magnetometer (VSM) were used for characterizing microstructures, soft magnetic properties, and evaluating the influence of adding manners of B on the stability of as-quenched specimens. The XRD curve shows a wide dispersion of peak, the TEM diffraction ring was dispersed cyclic, the pattern of the matrix was homogeneous, and the Mössbauer spectrum of as-quenched alloy presents a typical broadened and overlapped sextet, which confirms the as-quenched alloy in fully amorphous state. The DTA results showed the activation energy of Fe52Co34Hf7B6Cu1 alloy is 299.7KJ/mol. When pure B is replaced by FeB in preparing amorphous Fe52Co34Hf7B6Cu1 alloys, the activation energy reduced to 293.3 KJ/mol,and the soft magnetic property is decline according VSM results.

Initial magnetization curve of thin film media

1991 ◽  
Vol 27 (6) ◽  
pp. 5046-5048 ◽  
Author(s):  
A. Kawamoto ◽  
F. Hikami ◽  
S. Yasuda ◽  
N. Muto
Keyword(s):  
Thin Film ◽  
Magnetization Curve ◽  
Initial Magnetization
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