Antiferromagnetic Spin Coupling between Rare Earth Adatoms and Iron Islands Probed by Spin-Polarized Tunneling

Scientific Reports
David CoffeyJosé Ignacio Arnaudas

Abstract

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.

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Citations

Sep 27, 2016·Nature Communications·Ben WarnerCyrus F Hirjibehedin
Mar 10, 2017·Nature·Fabian D NattererChristopher P Lutz
Feb 4, 2016·Nature Communications·M SteinbrecherA A Khajetoorians
Apr 16, 2016·Science·F DonatiH Brune
Jan 5, 2019·Physical Review Letters·A SinghaH Brune
Dec 5, 2019·Physical Chemistry Chemical Physics : PCCP·David CoffeyJosé Ignacio Arnaudas
Sep 22, 2021·ACS Nano·Aparajita SinghaFabio Donati

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Methods Mentioned

BETA
X-ray
AFM
scanning tunneling microscopy

Software Mentioned

Vienna ab - initio simulation package ( VASP )

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