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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:50 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Solid State Physics and Materials Science
Title:
Concentration dependent magnetic properties of amorphous Fe-Gd thin films
Authors:
Anda Stanciu (1,2), Andrei Kuncser (1), Aurel Leca (1,3), Nicusor Iacob (1), Gabriel Schinteie (1), Andrei Catrina (1), Victor Kuncser (1)
*
Affiliation:
1) National Institute for Materials Physics, Bucharest-Magurele, Romania
2) Bucharest University, Faculty of Physics, Bucharest-Magurele, Romania
3) Politehnica University of Bucharest, Faculty of Electronics, Telecommunications and Information Technology, Bucharest, Romania
E-mail
andaelenastanciu@gmail.com
Keywords:
RE-TM amorphous thin films, inverted hysteresis loop
Abstract:
The magnetic, magneto-optical and magneto-transport features of rare-earth – transition metal (RE-TM) compounds are determined by the magnetic anisotropy of the RE element. In such intermetallics, Gd is an atom with no single ion anisotropy, having a null orbital moment (L=0, due to the 7 electrons on the 4f orbitals). The coupling of Gd with TM elements results in a simple antiferromagnetic structure since the single ion randomized anisotropy is zero in the case of Gd. Taking into account that the magnetic moments of the two elements are different (µGd = 7 µB and µFe = 2 µB), the overall magnetization can be compensated by changing their relative concentration. The present work aims at realising a comparison of the effects that occur when different concentrations crossing the magnetization compensation point are considered. Three Fe-Gd thin films, having similar thicknesses and concentrations well below, near or above the magnetization compensation point were prepared via the RF-magnetron sputtering technique. The morpho-structural and compositional characterization was realized via Grazing Incidence X-Ray Diffraction, X-Ray Reflectometry, Transmission Electron Microscopy and Scanning Electron Microscopy coupled with Energy Dispersive X-Ray Spectroscopy. Atomic local configurations and magnetic interactions were studied via Conversion Electron Mössbauer Spectroscopy and Superconducting Quantum Interference Device magnetometry. The distribution of local magnetization axis is analyzed via vectorial Magneto-Optic Kerr Effect measurements. The magneto-transport measurements were realized in perpendicular geometry at 50 K and at 300 K using a Physical Properties Measurement System (PPMS). The amorphous structure has been proven, together with particular magnetic behavior of Fe atoms, depending on their relative content. An inversion of the magneto-optic Kerr effect hysteretic curves was observed crossing the compensation point, being in detail discussed with respect to the other morpho-structural and magnetic aspects.
References:
1) J. L. Erskine, AIP Conf. Proc. 24, 190 (1975)
2) K. Moorjani, J. M. D. Coey, Methods and Phenomena 6, in S.P. Wolsky and A. W. Czanderna (Eds.) Elsevier, Amsterdam, (1984)
3) P. Hansen, C. Clausen, G. Much, M. Rosenkranz, K. Witter, J. Appl. Phys. 66, 756 (1989)
Acknowledgement:
This work was supported by the Romanian Ministry of Research and Innovation through projects PN-III 95PED/2017, PN-III-P1-1.2-PCCDI-2017-0871 and the Core Program PN18-11.
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