TU Darmstadt / ULB / TUbiblio

Impact of interface structure on magnetic exchange coupling in MnBi/Fe_x Co_{1−x} bilayers

Sabet, S. ; Moradabadi, Ashkan ; Gorji, S. ; Yi, Min ; Gong, Q. ; Fawey, Mohammed ; Hildebrandt, E. ; Wang, D. ; Zhang, Hongbin ; Xu, Bai-Xiang ; Kübel, Christian ; Alff, Lambert :
Impact of interface structure on magnetic exchange coupling in MnBi/Fe_x Co_{1−x} bilayers.
In: Physical Review B, 98 S. 174440. ISSN 1098-0121
[Artikel] , (2018)

Kurzbeschreibung (Abstract)

Magnetic exchange coupling behavior was investigated in MnBi/FeCo bilayer system at the hard/soft magnetic interface. We performed a combined study of cross-sectional high resolution transmission electron microscopy (HR-TEM), DFT calculations, and micromagnetic simulations to elucidate effect of interface structure on exchange coupling. Exchange spring MnBi/FexCo1-x (x = 0.65 and 0.35) bilayers with various thicknesses of the soft magnetic layer were deposited in a dc magnetron sputtering unit from alloy targets. According to magnetic measurements, using a Co-rich layer leads to a more coherent exchange coupling with optimum soft layer thickness of about 1 nm. Our DFT calculations predicted formation of a polycrystalline FeCo layer with coexisting crystalline and disordered (110) phases. The indexed FFTs from HR-TEM images confirmed a crystalline FeCo(110) layer, with slight misorientation in some areas, and a disordered region close to the interface which deteriorates interface exchange coupling. Moreover, our micromagnetic simulations showed how the thickness of the FeCo layer and the interface roughness both control the effectiveness of exchange coupling in MnBi/FeCo bilayer.

Typ des Eintrags: Artikel
Erschienen: 2018
Autor(en): Sabet, S. ; Moradabadi, Ashkan ; Gorji, S. ; Yi, Min ; Gong, Q. ; Fawey, Mohammed ; Hildebrandt, E. ; Wang, D. ; Zhang, Hongbin ; Xu, Bai-Xiang ; Kübel, Christian ; Alff, Lambert
Titel: Impact of interface structure on magnetic exchange coupling in MnBi/Fe_x Co_{1−x} bilayers
Sprache: Englisch
Kurzbeschreibung (Abstract):

Magnetic exchange coupling behavior was investigated in MnBi/FeCo bilayer system at the hard/soft magnetic interface. We performed a combined study of cross-sectional high resolution transmission electron microscopy (HR-TEM), DFT calculations, and micromagnetic simulations to elucidate effect of interface structure on exchange coupling. Exchange spring MnBi/FexCo1-x (x = 0.65 and 0.35) bilayers with various thicknesses of the soft magnetic layer were deposited in a dc magnetron sputtering unit from alloy targets. According to magnetic measurements, using a Co-rich layer leads to a more coherent exchange coupling with optimum soft layer thickness of about 1 nm. Our DFT calculations predicted formation of a polycrystalline FeCo layer with coexisting crystalline and disordered (110) phases. The indexed FFTs from HR-TEM images confirmed a crystalline FeCo(110) layer, with slight misorientation in some areas, and a disordered region close to the interface which deteriorates interface exchange coupling. Moreover, our micromagnetic simulations showed how the thickness of the FeCo layer and the interface roughness both control the effectiveness of exchange coupling in MnBi/FeCo bilayer.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Physical Review B
Band: 98
Verlag: American Physical Society
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Dünne Schichten
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Mechanik Funktionaler Materialien
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Theorie magnetischer Materialien
Hinterlegungsdatum: 09 Jan 2019 12:20
DOI: 10.1103/PhysRevB.98.174440
Sponsoren: Ministry of Higher Education, Research and the Arts (HMWK) of the state of Hessen, Germany
Export:

Optionen (nur für Redakteure)

Eintrag anzeigen Eintrag anzeigen