scholarly journals The Process of Magnetizing FeNbYHfB Bulk Amorphous Alloys in Strong Magnetic Fields

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1367
Author(s):  
Bartłomiej Jeż ◽  
Jerzy Wysłocki ◽  
Simon Walters ◽  
Przemysław Postawa ◽  
Marcin Nabiałek
Keyword(s):  
Magnetic Fields ◽  
Amorphous Alloys ◽  
Magnetization Vector ◽  
Direct Methods ◽  
Structural Defects ◽  
Alloy Sample ◽  
Magnetization Curves ◽  
Magnetization Process ◽  
Strong Magnetic Fields ◽  
Antiferromagnetic Ordering

The structure of amorphous alloys still has not been described satisfactorily due to the lack of direct methods for observing structural defects. The magnetizing process of amorphous alloys is closely related to its disordered structure. The sensitivity of the magnetization vector to any heterogeneity allows indirect assessment of the structure of amorphous ferromagnetic alloys. In strong magnetic fields, the magnetization process involves the rotation of a magnetization vector around point and line defects. Based on analysis of primary magnetization curves, it is possible to identify the type of these defects. This paper presents the results of research into the magnetization process of amorphous alloys that are based on iron, in the areas called the approach to ferromagnetic saturation and the Holstein–Primakoff para-process. The structure of a range of specially produced materials was examined using X-ray diffraction. Primary magnetization curves were measured over the range of 0 to 2 T. The process of magnetizing all of the tested alloys was associated with the presence of linear defects, satisfying the relationship Ddi p < 1H. It was found that the addition of yttrium, at the expense of hafnium, impedes the magnetization process. The alloy with an atomic content of Y = 10% was characterized by the highest saturation magnetization value and the lowest value of the Dspf parameter, which may indicate the occurrence of antiferromagnetic ordering in certain regions of this alloy sample.

scholarly journals Structure, Core Losses, Curie Temperature, Defects in the Structure of the Bulk Amorphous Alloy Fe55Co15W2Y8B20

2019 ◽  
Vol 70 (7) ◽  
pp. 2699-2702
Author(s):  
Joanna Gondro
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Amorphous Alloys ◽  
Bulk Amorphous Alloy ◽  
Magnetization Process ◽  
Soft Magnetic ◽  
Strong Magnetic Fields ◽  
Structure Defects ◽  
Core Losses ◽  
Structure And Microstructure

This paper presents studies relating to the structure and soft magnetic properties of the bulk amorphous alloys Fe55Co15W2Y8B20. Samples were made using the method of injecting a liquid alloy into a copper water-cooled mold in the form of plates. The structure and microstructure were examined using X-ray diffractometry. Magnetic properties were investigated from static and dynamic measurements. For the samples, the core losses were measured. The influence of structure defects on the magnetization process in strong magnetic fields was also investigated. For this purpose, the theory developed by H. Kronm�ller was used. It was shown that the magnetization process in strong magnetic fields is associated with two-dimensional defects, so-called pseudo-location dipoles.

The Study of Magnetization in Strong Magnetic Fields for Fe62-XCo10NbXY8B20 (X=0,1,2) Alloys

2017 ◽  
Vol 68 (2) ◽  
pp. 265-268 ◽  
Author(s):  
Konrad Gruszka ◽  
Marcin Nabialek ◽  
Michal Szota ◽  
Petrica Vizureanu ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Saturation Magnetization ◽  
Structural Defects ◽  
Magnetization Process ◽  
Strong Magnetic Fields ◽  
Coercivity Field ◽  
Bulk Alloys

The magnetization process in the area called the approach to ferromagnetic saturation for Fe62-xCo10NbxY8B20 (x = 0, 1, 2) bulk alloys was analyzed. The research were performed using the LakeShore vibrating magnetometer in the fields range of 0 T to 2 T. In the studied alloys, in strong magnetic fields, the structural defects affect magnetization process and the type of these defects was designated � on the basis of the Kronm�ller theory. The article shows that the addition of niobium instead of the iron slightly decreases the saturation magnetization and decreases the value of the coercivity field by filling structure voids leading to material increase in homogenisation.

scholarly journals Structural Defects In The FeCoYB Amorphous Alloys

2015 ◽  
Vol 60 (3) ◽  
pp. 2019-2024 ◽  
Author(s):  
K. Błoch ◽  
M. Nabiałek ◽  
J. Gondro ◽  
M. Szota
Keyword(s):  
Magnetic Fields ◽  
Amorphous Alloys ◽  
Magnetic Moments ◽  
Structural Defects ◽  
Major Influence ◽  
Strong Magnetic Fields ◽  
Thermally Induced ◽  
X Ray ◽  
Linear Defects ◽  
The Magnetic Field

Abstract The aim of this work was to determine the nature of the structural defects that have a major influence on the magnetisation process within the investigated alloys. The structure of the alloys in the as-quenched state was investigated by means of X-ray diffractometry. It was confirmed that the samples were amorphous. The magnetisation was measured within magnetic fields ranging from 0 to 2T using a vibrating sample magnetometer (VSM). The investigation of the ‘magnetisation in the area close to ferromagnetic saturation’ showed that, for this class of alloys, the magnetisation process in strong magnetic fields is connected with the following two influences: 1) Firstly, the rotation of the magnetic moments in the vicinity of the defects, which are the sources of the short-range stresses, and, 2) The dumping of the thermally-induced spin waves by the magnetic field. In the case of the Fe63Co10Y7B20 alloy, the magnetisation process is connected with both point and linear defects, whereas for the Fe64Co10Y6B20 alloy, only with linear defects. This suggests that the size of the defects, determining the character of the magnetisation in the vicinity of ferromagnetic saturation, depends on the atomic packing density. On the basis of analysis of the magnetisation curves, the spin wave stiffness parameter (Dsp) was calculated.

Strong magnetic fields

1960 ◽  
Vol 70 (4) ◽  
pp. 693-714 ◽  
Author(s):  
G.M. Strakhovskii ◽  
N.V. Kravtsov
Keyword(s):  
Magnetic Fields ◽  
Strong Magnetic Fields

Magnetic molecular nanoclusters in strong magnetic fields

2002 ◽  
Vol 172 (11) ◽  
pp. 1303 ◽  
Author(s):  
Anatolii K. Zvezdin ◽  
Viktor V. Kostyuchenko ◽  
V.V. Platonov ◽  
V.I. Plis ◽  
A.I. Popov ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Strong Magnetic Fields

The Influence of Isothermal Annealing and Structural Defects on Properties of Amorphous Fe78Si11B11 with High Magnetization Saturation

2017 ◽  
Vol 68 (3) ◽  
pp. 478-482 ◽  
Author(s):  
Katarzyna Bloch
Keyword(s):  
Numerical Analysis ◽  
Thermal Treatment ◽  
Saturation Magnetization ◽  
Isothermal Annealing ◽  
Diffusion Processes ◽  
Structural Defects ◽  
High Saturation Magnetization ◽  
Magnetization Curves ◽  
Magnetization Saturation ◽  
Very High

This paper presents the results of numerical analysis of the primary magnetization curves, which were obtained under the assumptions of the theory of approach to ferromagnetic saturation described in by H. Kronm�ller. Test samples of the Fe78Si11B11 alloy were tape-shaped materials, which were subjected to isothermal annealing, not causing their crystallization. The investigated ribbons (tapes) were characterized by a very high saturation magnetization value of approximately 2T, which the thermal treatment has increased by about 10%. It was found that reason for the change of saturation magnetization of the investigated samples was the local rearrangement of atoms due to diffusion processes leading to the release of free volumes to the surface and combining of them into larger unstable defects called pseudodislocational dipoles.

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.

Sign in / Sign up

Export Citation Format

Share Document