Investigations on the Magnetic Properties of High-Coercivity (Nd1−xFex)90Al10 Bulk Amorphous Alloys

2001 ◽  
Vol 674 ◽  
Author(s):  
N. Lupu ◽  
H. Chiriac ◽  
A. Takeuchi ◽  
A. Inoue
Keyword(s):  
Magnetic Properties ◽  
Cooling Rate ◽  
Amorphous Alloys ◽  
Magnetic Measurements ◽  
High Coercivity ◽  
Magnetic Clusters ◽  
Cast State ◽  
Fe Content ◽  
Mould Casting ◽  
Microstructure And Magnetic Properties

ABSTRACTBulk rods with diameters up to 3 mm prepared by suction casting and respectively mould casting and melt-spun amorphous ribbons with thicknesses in the range 25 – 150 μm with compositions Nd90−xFexAl10 (x = 35; 40; 45; 50) were investigated by XRD, DSC and magnetic measurements in the temperature range 5 – 600 K. The microstructure and magnetic properties are strongly dependent on the cooling rate, preparation process and Fe content. The large values of the coercive field, which amount to 320 kA/m in the as-cast state as well as the increase with decrease of the temperature and cooling rate result from the formation of very small metastable or nonequilibrium magnetic clusters.

Influence of Alloying Additions on Enhancement of Soft Magnetic Properties Effect and Crystallization in FeXSiB (X=Cu, V, Co, Zr, Nb) Amorphous Alloys

2007 ◽  
Vol 130 ◽  
pp. 171-174 ◽  
Author(s):  
Z. Stokłosa ◽  
G. Badura ◽  
P. Kwapuliński ◽  
Józef Rasek ◽  
G. Haneczok ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Crystallization Process ◽  
Annealing Temperature ◽  
Magnetic Measurements ◽  
X Ray Diffraction ◽  
Soft Magnetic ◽  
X Ray ◽  
Second Stage ◽  
Transmission Electron

The crystallization and optimization of magnetic properties effects in FeXSiB (X=Cu, V, Co, Zr, Nb) amorphous alloys were studied by applying X-ray diffraction methods, high resolution transmission electron microscopy (HRTEM), resistometric and magnetic measurements. The temperatures of the first and the second stage of crystallization, the 1h optimization annealing temperature and the Curie temperature were determined for different amorphous alloys. Activation energies of crystallization process were obtained by applying the Kissinger method. The influence of alloy additions on optimization effect and crystallization processes was carefully examined.

Microstructure and magnetic properties of FePt and Fe/FePt polycrystalline films with high coercivity

2004 ◽  
Vol 96 (1) ◽  
pp. 475-481 ◽  
Author(s):  
Y. K. Takahashi ◽  
T. O. Seki ◽  
K. Hono ◽  
T. Shima ◽  
K. Takanashi
Keyword(s):  
Magnetic Properties ◽  
High Coercivity ◽  
Polycrystalline Films ◽  
Microstructure And Magnetic Properties

The Variation of Magnetic Properties of Fe-Based Amorphous Alloys Along the Ribbon Length

1981 ◽  
Vol 8 ◽  
Author(s):  
Takashi Sato ◽  
Tsutomu Ozawa ◽  
Toshio Yamada ◽  
Ryutaro Matsumoto
Keyword(s):  
Magnetic Properties ◽  
Surface Temperature ◽  
Cooling Rate ◽  
Amorphous Alloys ◽  
Core Loss ◽  
Ribbon Thickness ◽  
Surface Layers ◽  
Roller Surface ◽  
Amorphous Ribbons ◽  
The Relationship

ABSTRACTThe variation of ac magnetic properties along the length of melt-spun Fe-based amorphous ribbons was examined in relation to the variations of the roller surface temperature and the ribbon thickness. The results indicated that the lengthwise variation of magnetic properties strongly depends both on the roller surface temperature and the ribbon thickness. The critical cooling rates at which core loss begins to increase were determined from the relationship between core loss and cooling rate. For ribbons cast at lower cooling rate than critical cooling rate, the finedomain patterns were usually observed on the free surface. From the disappearance of the fine-domain pattern and the remarkable decrease of core loss by removal of the surface layers, it is ascertained that the surface layers deteriorate magnetic properties.

Cooling rate controlled microstructure and magnetic properties of metastable Fe20Nd80 alloys

2006 ◽  
Vol 14 (1) ◽  
pp. 47-53 ◽  
Author(s):  
G. Kumar ◽  
O. Filip ◽  
W. Löser ◽  
L. Schultz ◽  
J. Eckert
Keyword(s):  
Magnetic Properties ◽  
Cooling Rate ◽  
Rate Controlled ◽  
Microstructure And Magnetic Properties

EFFECTS OF SPUTTERED Ar PRESSURE AND SUBSTRATE TEMPERATURE ON THE MICROSTRUCTURE AND MAGNETIC PROPERTIES OF Cr/SmCo5/Cr FILMS

2008 ◽  
Vol 15 (01n02) ◽  
pp. 105-109
Author(s):  
CONGMIAN ZHEN ◽  
JINJUAN ZHANG ◽  
LI MA ◽  
DENGLU HOU ◽  
YING LIU ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Substrate Temperature ◽  
Magnetic Measurements ◽  
Body Centered Cubic ◽  
Switching Field ◽  
X Ray ◽  
Atomic Force ◽  
Diffraction Peaks ◽  
Ray Diffusion ◽  
Microstructure And Magnetic Properties

Cr / SmCo 5/ Cr films were fabricated by a DC facing targets magnetron sputtering. The influences of sputtered Ar pressure and substrate temperature on their microstructure and magnetic properties were investigated. Magnetic measurements indicate that the optimal substrate temperature was 450°C, and the film deposited at 2 Pa Ar pressure had the largest in-plane coercivity (2403.54 Oe). No SmCo 5 diffraction peaks except Cr (110) peak with body-centered-cubic structure were seen in all the samples by X-ray diffusion. The Needle-like grains of the film deposited at low Ar pressure were observed by atomic force microscope. The domain pattern of the film fabricated at 2 Pa Ar pressure showed more uniform. When the sputtered Ar pressure was 2 Pa, the narrowest switching field distribution (0.57) was obtained, indicating a narrower grain size distribution. The δM value was nearly zero for the film deposited at 2 Pa Ar pressure, and this indicated that there was almost noninteraction between grains.

scholarly journals Structure and Soft Magnetic Properties of the Amorphous Alloys: Fe61Co10Ti3-xY6+xB20 (x = 0, 1)

2016 ◽  
Vol 61 (1) ◽  
pp. 445-450
Author(s):  
K. Błoch
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Major Effect ◽  
Exothermic Peak ◽  
Soft Magnetic Properties ◽  
X Ray Diffraction ◽  
Cast State ◽  
Soft Magnetic ◽  
Two Peaks ◽  
Thermal Stability Of

This paper presents studies relating to the structure, soft magnetic properties and thermal stability of the following bulk amorphous alloys: Fe61Co10Ti3-xY6+xB20 (x = 0, 1). On the basis of the performed X-ray diffraction studies and Mössbauer spectroscopy, it was found that investigated samples were amorphous in the as-cast state. The DSC curve obtained for Fe61Co10Ti2Y7B20 alloy exhibited one exothermic peak, while for the Fe61Co10Ti3Y6B20 sample, two peaks were distinguishable. The change in the chemical structure of the investigated alloys has a major effect on their soft magnetic properties; especially on coercivity and saturation magnetization. On the basis of the magnetization curves analysis, the spin wave stiffness parameter Dsp were determined for the investigated alloys.

scholarly journals Microstructure And Magnetic Properties Of The FeZr(Y)NbCuB Amorphous Alloys

2015 ◽  
Vol 60 (2) ◽  
pp. 1071-1074 ◽  
Author(s):  
J. Gondro ◽  
K. Błoch ◽  
M. Nabiałek ◽  
K. Waltters ◽  
M. Szota
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Chemical Composition ◽  
Curie Temperature ◽  
Amorphous Alloys ◽  
X Ray ◽  
Low Field ◽  
A Minor ◽  
Structure And Microstructure ◽  
Microstructure And Magnetic Properties

Abstract In this paper, the results of investigations are presented, into the microstructure and magnetic properties of the following amorphous alloys in the as-quenched state: Fe82Zr7Nb2Cu1B8 and Fe86Zr4Y3Nb1Cu1B5. The studied material was produced in the form of thin ribbons of 3 mm width and 20 μm thickness. The structure and microstructure of the samples have been investigated by means of Mössbauer spectrometry and X-ray diffractometry. In addition, the magnetic properties of these materials have been determined, i.e. the low-field magnetic susceptibility, and the magnetisation as a function of temperature and magnetising field. On the basis of the performed investigations, it has been found that a minor change in the quantities of elements favouring amorphisation, such as: Zr and Y, has an influence on the value of the Curie temperature and the magnetic properties of the resulting alloys. It should be noticed that the changes, introduced in the chemical composition of the alloys, don’t change the combined volume of these elements, i.e. Zr7 and Zr4Y3.

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