A ferromagnetic Eu-Pt surface compound grown below hexagonal boron nitride
Artikel i vetenskaplig tidskrift, 2023
One of the fundamental applications for monolayer-thick 2D materials is their use as protective layers of metal surfaces and in situ intercalated reactive materials in ambient conditions. Here we investigate the structural, electronic, and magnetic properties, as well as the chemical stability in air of a very reactive metal, Europium, after intercalation between a hexagonal boron nitride (hBN) layer and a Pt substrate. We demonstrate that Eu intercalation leads to a hBN-covered ferromagnetic EuPt2 surface alloy with divalent Eu2+ atoms at the interface. We expose the system to ambient conditions and find a partial conservation of the di-valent signal and hence the Eu-Pt interface. The use of a curved Pt substrate allows us to explore the changes in the Eu valence state and the ambient pressure protection at different substrate planes. The interfacial EuPt2 surface alloy formation remains the same, but the resistance of the protecting hBN layer to ambient conditions is reduced, likely due to a rougher surface and a more discontinuous hBN coating.
Författare
Alaa Mohammed Idris Bakhit
Consejo Superior de Investigaciones Científicas (CSIC)
Universidad del Pais Vasco / Euskal Herriko Unibertsitatea
Khadiza Ali
Donostia International Physics Center
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Anna A. Makarova
Freie Universität Berlin
Igor Píš
Consiglio Nazionale delle Ricerche (CNR)
Federica Bondino
Consiglio Nazionale delle Ricerche (CNR)
Roberto Sant
European Synchrotron Radiation Facility (ESRF)
Saroj Prasad Dash
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
R. Castrillo-Bodero
Consejo Superior de Investigaciones Científicas (CSIC)
Yuri Hasegawa
College of Life Sciences
Consejo Superior de Investigaciones Científicas (CSIC)
J. E. Ortega
Donostia International Physics Center
Consejo Superior de Investigaciones Científicas (CSIC)
Universidad del Pais Vasco / Euskal Herriko Unibertsitatea
L. Fernandez
Consejo Superior de Investigaciones Científicas (CSIC)
F. Schiller
Consejo Superior de Investigaciones Científicas (CSIC)
Donostia International Physics Center
Nanoscale
2040-3364 (ISSN) 20403372 (eISSN)
Vol. 15 27 11517-11528Ämneskategorier (SSIF 2011)
Den kondenserade materiens fysik
DOI
10.1039/d3nr00630a