Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8158373 | Journal of Magnetism and Magnetic Materials | 2013 | 8 Pages |
Abstract
Transmission Mössbauer spectra of amorphous Fe86Zr7Nb1Cu1B5, Fe81Zr7Nb1Cu1B10 and Fe81Pt5Zr7Nb1Cu1B5 alloys in the as-quenched state and subjected to the accumulative annealing for 15Â min in the temperature range from 573Â K up to 750Â K are presented. After these heat treatments the alloys remain in the amorphous state. The accumulative annealing for 15Â min at 573Â K and then 600Â K of the Fe86Zr7Nb1Cu1B5 and Fe81Zr7Nb1Cu1B10 alloys causes the narrowing of the transmission Mössbauer spectra as compared to the as-quenched state and the decrease of the average hyperfine field induction which is connected with the invar effect. For similar behavior in Fe81Pt5Zr7Nb1Cu1B5 alloy the accumulative annealing up to 700Â K is needed. With further increase of the annealing temperature up to 750Â K the broadening of the Mössbauer spectra and the increase of the average hyperfine field induction occur. The lowest value of the average hyperfine field induction of amorphous samples is accompanied by the lowest value of the Curie temperature. The investigated amorphous alloys do not reach the magnetic saturation up to the magnetizing field of 2Â T and the coefficient in Holstein-Primakoff term is about one order in magnitude larger than in other classical FeCo-based amorphous alloys due to the non-collinear magnetic structure. The Mössbauer spectra and hysteresis loops of the amorphous Fe86Zr7Nb1Cu1B5 alloy in the as-quenched state and after the accumulative annealing at 573+620Â K for 15Â min are sensitive to the tensile stresses subjected to the sample. Such behavior is ascribed to the invar anomalies.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
J. Gondro, J. Åwierczek, J. RzÄ
cki, W. CiurzyÅska, J. Olszewski, J. Zbroszczyk, K. BÅoch, M. Osyra, A. Åukiewska,