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Influence of Heat Treatment on Magnetic Properties of Nanocrystalline Nd9Fe84Zr1B6 Ribbons Received by Rapid Solidification Method

100%
Dośpiał M., Ceglarek A., Płusa D., Pawlik P.
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issue 1
2
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Effect of Preparing Conditions on the Phase Constitution and Magnetic Properties of Nd-Pr-Fe-Zr-B Alloy Ribbons

100%
Ceglarek A., Gębara P., Płusa D.
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EN
The aim of presented work was to study influence of preparing conditions on phase constitution and magnetic properties of the RE-Fe-B nanocomposite magnets doped with Zr. X-ray studies carried out for samples obtained under lower pressure of Ar atmosphere (0.6×10⁵ Pa) revealed higher ability to formation of nanocrystalline structure. In case of higher pressure of Ar (0.8×10⁵ Pa) it was possible to obtain full amorphous ribbon during melt-spinning process. The best magnetic properties (means the higher values of coercivity field _{J}H_{c}, remanence J_{r} and maximum energy product (BH)_{max}) were measured for sample prepared with the lowest copper wheel speed 20 m/s and higher pressure of Ar (0.8×10⁵ Pa).
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Investigation of the Magnetization Reversal Process of High-Remanent Nd_{10}Fe_{83}Zr_1B_6 Alloy in the As-Cast State

88%
Ceglarek A., Płusa D., Dośpiał M., Nabiałek M., Pietrusiewicz P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1279-1281
EN
In this work the magnetic properties of ribbons with composition of Nd_{10}Fe_{83}Zr_1B_6 obtained by using the melt-spinning method were studied. From the X-ray diffraction patterns the phase composition was determined. It was found that investigated alloy was composed of α-Fe and Nd_2Fe_{14}B phases. From the peaks broadening the grain sizes of α-Fe and Nd_2Fe_{14}B phases were estimated as equal to 20 nm and 40 nm, respectively. From the recoil curves the reversible μ_0 M_{rev} and irreversible μ_0 M_{irr} parts of magnetization and differential susceptibility χ_{rev} and χ_{irr} were determined as a function of an applied field. From these dependences it was found that the pinning of domain walls at the grain boundaries is the main magnetization reversal process. The interactions between grains were investigated by means of the δ M plot. It was stated that short range exchange interaction between grains of hard and soft phases are dominant and causes the remanence enhancement.
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The Investigation of the Magnetization Reversal Mechanism in the Nd-Fe-B Type Magnet, Aligned by Hot Deformation

76%
Dośpiał M., Nabiałek M., Szota M., Lipiec W., Nizhankovskii V., Ceglarek A., Pietrusiewicz P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1282-1284
EN
The magnetization reversal mechanism in the Nd_{16}Fe_{78}B_6 hot densified magnet, aligned by means of die-upset forging has been investigated. The magnetic parameters have been derived from major hysteresis loop. The magnetocrystalline anisotropy constants K_1 and K_2 using Sucksmith-Thompson relation modified by Ram and Gaunt have been calculated from the high field measurements up to 5 T. These data have been used to determine the theoretical value of coercivity as a function of the angle Ψ_0 between the sample easy axis and the applied magnetic field direction. The experimental value of coercivity as a function of Ψ_0 has been determined from the demagnetization curves measured for different Ψ_0 angles. It was found that the best correlation between theoretical and experimental data have been achieved for magnetization reversal mechanism controlled partially by pinning of domain walls on grain boundaries and nucleation processes.
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