Proximity Induced Magnetic Anisotropy and Trefoil Fermiology in Monolayer FeCl2/Bi(111)
(2026) In Advanced Materials 38(16).- Abstract
Interfaces between magnetic and non-magnetic materials play a crucial role in various magnetic heterostructures. The emergence of 2D van der Waals (vdW) magnets has introduced new opportunities for exploring proximity effects in vdW heterostructures. While the influence of magnetic layers on nearby non-magnetic materials has been widely studied, it remains unclear whether non-magnetic substrates can similarly modulate the intrinsic magnetic properties of 2D magnets, particularly their magnetic anisotropy. In this work, by analyzing X-ray magnetic circular dichroism spectra of an epitaxially grown FeCl2 monolayer on a Bi(111) surface, a reorientation of magnetic anisotropy is observed – from its natural out-of-plane to a... (More)
Interfaces between magnetic and non-magnetic materials play a crucial role in various magnetic heterostructures. The emergence of 2D van der Waals (vdW) magnets has introduced new opportunities for exploring proximity effects in vdW heterostructures. While the influence of magnetic layers on nearby non-magnetic materials has been widely studied, it remains unclear whether non-magnetic substrates can similarly modulate the intrinsic magnetic properties of 2D magnets, particularly their magnetic anisotropy. In this work, by analyzing X-ray magnetic circular dichroism spectra of an epitaxially grown FeCl2 monolayer on a Bi(111) surface, a reorientation of magnetic anisotropy is observed – from its natural out-of-plane to a predominantly in-plane alignment. This effect vanishes in bilayer FeCl2/Bi(111), where the magnetic anisotropy reverts to its intrinsic out-of-plane orientation, consistent with the layered antiferromagnetic order of bulk FeCl2. Angle-resolved photoelectron spectroscopy reveals the presence of metallic interface states derived from the Bi surface states, accompanied by charge transfer and emergence of a moiré potential that gives rise to a distinctive trefoil-shaped Fermi surface. These results demonstrate that non-magnetic substrates can exert strong proximity influence on the magnetic and electronic behavior of 2D vdW magnets, offering new strategies for engineering magnetic anisotropy and electronic structure in spintronic heterostructures.
(Less)
- author
- organization
- publishing date
- 2026-03-17
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- 2D magnet, interface states, magnetic anisotropy, trefoil Fermi surface, vdW heterostructure
- in
- Advanced Materials
- volume
- 38
- issue
- 16
- article number
- e21534
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- pmid:41711345
- scopus:105030706587
- ISSN
- 0935-9648
- DOI
- 10.1002/adma.202521534
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2026 The Author(s). Advanced Materials published by Wiley-VCH GmbH.
- id
- 45c0f9dd-d332-4a29-b7d4-c1c5ea5f6c6f
- date added to LUP
- 2026-04-07 15:35:30
- date last changed
- 2026-09-10 11:23:47
@article{45c0f9dd-d332-4a29-b7d4-c1c5ea5f6c6f,
abstract = {{<p>Interfaces between magnetic and non-magnetic materials play a crucial role in various magnetic heterostructures. The emergence of 2D van der Waals (vdW) magnets has introduced new opportunities for exploring proximity effects in vdW heterostructures. While the influence of magnetic layers on nearby non-magnetic materials has been widely studied, it remains unclear whether non-magnetic substrates can similarly modulate the intrinsic magnetic properties of 2D magnets, particularly their magnetic anisotropy. In this work, by analyzing X-ray magnetic circular dichroism spectra of an epitaxially grown FeCl<sub>2</sub> monolayer on a Bi(111) surface, a reorientation of magnetic anisotropy is observed – from its natural out-of-plane to a predominantly in-plane alignment. This effect vanishes in bilayer FeCl<sub>2</sub>/Bi(111), where the magnetic anisotropy reverts to its intrinsic out-of-plane orientation, consistent with the layered antiferromagnetic order of bulk FeCl<sub>2</sub>. Angle-resolved photoelectron spectroscopy reveals the presence of metallic interface states derived from the Bi surface states, accompanied by charge transfer and emergence of a moiré potential that gives rise to a distinctive trefoil-shaped Fermi surface. These results demonstrate that non-magnetic substrates can exert strong proximity influence on the magnetic and electronic behavior of 2D vdW magnets, offering new strategies for engineering magnetic anisotropy and electronic structure in spintronic heterostructures.</p>}},
author = {{Terakawa, Shigemi and Liu, Binbin and Schindler, Frank and Neupert, Titus and Ji, Jing Rong and Domaine, Gabriele and McFarlane, Emily C. and Geng, Daiyu and Yang, Jiabao and Choueikani, Fadi and Ohresser, Philippe and Valvidares, Manuel and Gargiani, Pierluigi and Polley, Craig and Carbone, Gerardina and Leandersson, Mats and Parkin, Stuart S.P. and Bedoya-Pinto, Amilcar and Schröter, Niels B.M.}},
issn = {{0935-9648}},
keywords = {{2D magnet; interface states; magnetic anisotropy; trefoil Fermi surface; vdW heterostructure}},
language = {{eng}},
month = {{03}},
number = {{16}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Advanced Materials}},
title = {{Proximity Induced Magnetic Anisotropy and Trefoil Fermiology in Monolayer FeCl<sub>2</sub>/Bi(111)}},
url = {{http://dx.doi.org/10.1002/adma.202521534}},
doi = {{10.1002/adma.202521534}},
volume = {{38}},
year = {{2026}},
}