Adsorption-Induced Surface Magnetism
Miloš Baljozović, Shiladitya Karmakar, André L. Fernandes Cauduro, Mothuku Shyam Sundar, Marco Lozano, Manish Kumar, Diego Soler-Polo, Andreas K. Schmid, Ashutosh V. Bedekar, Pavel Jelinek, Karl-Heinz Ernst
TL;DR
This study shows how adsorbing certain molecules on a copper surface can create magnetism, offering new ways to design spin-polarized states in hybrid materials.
Contribution
The paper introduces a novel mechanism for inducing surface magnetism through molecular adsorption without using magnetic materials.
Findings
Spin-polarized states form on Cu(100) when TO[11]H molecules are adsorbed.
Strong chemisorption and hybridization between molecular and copper states drive spin polarization.
A modified theoretical model explains the threshold for spin polarization emergence.
Abstract
We report the emergence of adsorption-induced magnetism from heterohelicene molecules on a nonmagnetic Cu(100) surface. Spin-polarized low-energy electron microscopy measurements reveal spin-dependent electron reflectivity for enantiopure 7,12,17-trioxa[11]helicene (TO[11]H) monolayers, indicating the formation of a spin-polarized state localized in the topmost copper layer. Control experiments on clean Cu(100) and TO[11]H on highly oriented pyrolytic graphite show no such effect, excluding artifacts and chirality-induced spin selectivity as origins. Spin-polarized density functional theory calculations with hybrid functionals attribute the magnetism to strong chemisorption, which induces hybridization between the molecular HOMO and copper s- and d-states, driving asymmetric spin-polarized charge redistribution at the interface. An extended Newns–Anderson–Grimley model incorporating…
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Taxonomy
TopicsSynthesis and Properties of Aromatic Compounds · Surface Chemistry and Catalysis · Graphene research and applications