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2015 ; 5
(ä): 13709
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Antiferromagnetic Spin Coupling between Rare Earth Adatoms and Iron Islands
Probed by Spin-Polarized Tunneling
#MMPMID26333417
Coffey D
; Diez-Ferrer JL
; Serrate D
; Ciria M
; de la Fuente C
; Arnaudas JI
Sci Rep
2015[Sep]; 5
(ä): 13709
PMID26333417
show ga
High-density magnetic storage or quantum computing could be achieved using small
magnets with large magnetic anisotropy, a requirement that rare-earth iron alloys
fulfill in bulk. This compelling property demands a thorough investigation of the
magnetism in low dimensional rare-earth iron structures. Here, we report on the
magnetic coupling between 4f single atoms and a 3d magnetic nanoisland. Thulium
and lutetium adatoms deposited on iron monolayer islands pseudomorphically grown
on W(110) have been investigated at low temperature with scanning tunneling
microscopy and spectroscopy. The spin-polarized current indicates that both kind
of adatoms have in-plane magnetic moments, which couple antiferromagnetically
with their underlying iron islands. Our first-principles calculations explain the
observed behavior, predicting an antiparallel coupling of the induced 5d
electrons magnetic moment of the lanthanides with the 3d magnetic moment of iron,
as well as their in-plane orientation, and pointing to a non-contribution of 4f
electrons to the spin-polarized tunneling processes in rare earths.