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001-es BibID:	BIBFORM131682
035-os BibID:	(WoS)001497928200001 (Scopus)105005178123
Első szerző:	Katona Gábor (fizikus)
Cím:	Diffusion-driven L10 FePt phase formation in Fe/Ag(Au)/Pt and Pt/Ag(Au)/Fe trilayers with inverted layer stacking / G.L. Katona, P.V. Makushko, N.Y. Schmidt, O. Lik, T.I. Verbytska, G. Beddies, D.L. Beke, M. Albrecht, Yu.M. Makogon
Dátum:	2025
ISSN:	2666-8459
Megjegyzések:	In this work the diffusion-induced formation of an ordered L10 FePt phase in Fe(15 nm)/Ag(Au)(10 nm)/Pt(15 nm) and Pt(15 nm)/Ag(Au)/Fe(15 nm) trilayers with a Ag(Au) interlayer upon annealing is studied. The films were prepared by magnetron sputtering on SiO2/Si(001) substrates. Isothermal annealing of the samples was carried out in vacuum at 700?S for different annealing times up to 30 min. It was found that the stacking sequence of the trilayer has a strong impact on the direction of the diffusion process. This results in the formation of different chemical composition along the film thickness which is explained by the different formation enthalpies of possible phases. Finally, the hard magnetic L10 FePt phase is formed with grain boundaries filled by Ag(Au) resulting in enhanced coercivity. In addition, depending on the layer stacking sequence, the remaining Ag(Au) can be found either on the top surface or at the substrate interface. In this regard, employing different diffusion paths on selected layer stacks is a promising approach of forming gradient nanomaterials with properties that might be useful for practical applications.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Results in Surfaces and Interfaces. - 19 (2025), p. 1-9. -
További szerzők:	Makushko, P. V. Schmidt, N. Y. Lik, O. Verbytska, T. I. Beddies, Gunter Beke Dezső László (1945-) (fizikus) Albrecht, Manfred Makogon, I. M.
Pályázati támogatás:	DAAD (Leonard-Euler scholarship program) Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
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001-es BibID:	BIBFORM103238
035-os BibID:	(WOS)000570817200001 (Scopus)85091078768
Első szerző:	Makushko, P. V.
Cím:	Formation of ordered L10-FePt phase in FePt-Ag thin films / P. V. Makushko, M. N. Shamis, N. Y. Schmidt, I. E. Kotenko, S. Gulyas, G. L. Katona, T. I. Verbytska, D. L. Beke, M. Albrecht, Iu. M. Makogon
Dátum:	2020
ISSN:	2190-5509 2190-5517
Megjegyzések:	In this work, the influence of an Ag layer, which is located at different positions of the layer stack (top, intermediate, bottom), on the structural and magnetic properties of orderedL1(0)phase in Fe(50)Pt(50)films was investigated. It was found that the position of an additional Ag layer affects the stress state of the as-deposited FePt films. Mechanical stress is induced during deposition and post-annealing process due to the difference in thermal expansion coefficients and lattice mismatch of FePt, Ag, and substrate. The initial stress state affects the ordering process during subsequent heat treatment. The higher level of initial compressive stress (- 7.8 GPa) in FePt/Ag/FePt films results inL1(0)phase formation at a temperature of 700 degrees C which is about 100 degrees C lower than in films with Ag bottom (- 3.6 GPa) and top (+ 0.86 GPa) layers. A more pronounced (001) oriented growth of theL1(0)phase was observed in stacks with Ag top layer as compared to Ag bottom and intermediate layers. The highest values of coercivity were obtained for films with Ag intermediate and bottom layers, which is due to the distribution of Ag along FePt grain boundaries that result in strong exchange decoupling of FePt grains. Furthermore, the formation of the orderedL1(0)phase at comparatively low temperatures of about 370 degrees C was observed in a free-standing FePt/Ag (30 nm)/FePt film.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Stress state Annealing Ordering L1(0)-FePt phase Coercivity
Megjelenés:	Applied Nanoscience. - 10 : 12 (2020), p. 4809-4816. -
További szerzők:	Shamis, M. N. Schmidt, N. Y. Kotenko, I. E. Gulyás Szilvia (1993-) (fizikus) Katona Gábor (1977-) (fizikus) Verbytska, T. I. Beke Dezső László (1945-) (fizikus) Albrecht, Manfred Makogon, I. M.
Pályázati támogatás:	V4EaP Scholar-ship 51300654 Egyéb GINOP-2.3.2-15-2016-00041 GINOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: