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oai:figshare.com:article/34018137 2026-09-28T18:05:54Z category_1 category_4 category_915 category_16 category_21 category_272 category_873 portal_63 item_type_6 month_year_09_2026

Graphene-Enhanced Magnetic Anisotropies in Fe/Ni (100) Superlattices with Monolayer Periodicity Iban Llamas (24520262) José Luis Fernández-Cuñado (25132938) Inés Garcia-Manuz (25132941) Paolo Perna (5578862) Sofía O. Parreiras (25132944) Miguel Ángel Valbuena (25132947) Cristina Navío (2351332) Antonio Hernando (1440622) Rodolfo Miranda (1439929) Biophysics Biochemistry Physical Sciences not elsewhere classified Physiology Biotechnology Environmental Sciences not elsewhere classified Chemical Sciences not elsewhere classified thin magnetic layers strongly distorted face observed magnetic phenomena enhanced magnetic anisotropies external interface produces 89 ± 0 87 ± 0 plane magnetic anisotropy plane anisotropy superimposed monolayer periodicity fe fe charge transfer graphene also introduces u </ sub spin </ sub 3 </ sup surface anisotropy biaxial anisotropy >< sub k </ respective π ray diffraction electronic hybridization centered tetragonal based x alternate monolayers additional trigonal 08 mj 03 mj Fe/Ni(100) superlattices grown on graphene/Ir(100) by intercalation of alternate monolayers of Ni and Fe under graphene show magnetic properties severely modified. The graphene–iron interaction at the external interface produces a surface anisotropy <i>K</i>_int(gr/Fe) = 0.89 ± 0.08 mJ/m², large enough to drive the uniaxial, out-of-plane magnetic anisotropy of the whole superlattice to <i>K</i>_U = 0.87 ± 0.03 MJ/m³ and compensate the in-plane shape anisotropy characteristic of thin magnetic layers. Graphene also introduces an additional trigonal in-plane anisotropy superimposed to the biaxial anisotropy of the underlying Fe/Ni (100) superlattice and increases the <i>m</i>_L(parallel)/<i>m</i>_spin ratio by 50% with respect to Fe/Ni films grown without graphene, as determined by XMCD. The films show chemical ordering plane-by-plane and a strongly distorted face-centered tetragonal (fct) structure, as determined by synchrotron-based X-ray diffraction. The gr-Fe charge transfer and the electronic hybridization of the respective π and d bands at the interface are responsible for the observed magnetic phenomena. 2026-09-28T00:00:00Z Text Journal contribution 10.1021/acs.nanolett.6c03892.s001 https://figshare.com/articles/journal_contribution/Graphene-Enhanced_Magnetic_Anisotropies_in_Fe_Ni_100_Superlattices_with_Monolayer_Periodicity/34018137 CC BY-NC 4.0