Qualitative Analysis of Magnetization versus Temperature Curves in Amorphous Fe70-xCoxMn10Mo5B15 (0≤x≤0.5) Alloys at Low Magnetizing Field |
| A. Kupczyka, J. Świerczeka, M. Hasiakb
aInstitute of Physics, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland bDepartment of Mechanics and Materials Science, Wrocław University of Technology, M. Smoluchowskiego 25, 50-370 Wrocław, Poland |
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| The Curie temperature is usually obtained by differentiating of the temperature magnetization curves (σ(T)) or by analyzing the critical behavior of magnetization at temperature, close to but lower than the Curie point. The paper presents magnetization versus temperature curves in the range 50-400 K for amorphous Fe70-xCoxMn10Mo5B15 (0 ≤x≤ 0.5) alloys, applying external magnetizing field of 2.5, 5, and 25 mT, after earlier demagnetization and cooling of samples in the presence (field cooled) and without magnetic field (zero field cooled). The complicated runs of magnetization versus temperature curves for low magnetizing fields is the result of several processes: freezing of spins, different temperature dependence of magnetization and magnetic anisotropy constant and antiferromagnetic coupling in iron-manganese and cobalt- manganese pairs. |
DOI:10.12693/APhysPolA.135.133 PACS numbers: 75.50.Kj, 75.50.Bb, 75.60.Ej |