Journal Article

PUBDB-2025-00282

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Proximity coupling induced two dimensional magnetic order in EuO-based synthetic ferrimagnets

Rosenberger, P.Extern* ; Kundu, M. ; Gloskovskii, A.DESY* ; Schlueter, C.DESY* ; Nowak, U.Extern* ; Mueller, M. (Corresponding author)Extern*

2024
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41598-024-70548-7  doi:10.3204/PUBDB-2025-00282

Abstract: Proximity effects allow for the adjustment of magnetic properties in a physically elegant way. If twothin ferromagnetic (FM) films are brought into contact, electronic coupling alters their magneticexchange interaction at their interface. For a low‑$T_C$ rare‑earth FM coupled to a 3d transition metalFM, even room temperature magnetism is within reach. In addition, magnetic proximity coupling isparticularly promising for increasing the magnetic order of metastable materials such as europiummonoxide (EuO) beyond their bulk $T_C$ , since neither the stoichiometry nor the insulating properties aremodified. We investigate the magnetic proximity effect at Fe/EuO and Co/EuO interfaces using hardX‑ray photoelectron spectroscopy. By exciting the FM layers with circularly polarized light, magneticdichroism is observed in angular dependence on the photoemission geometry. In this way, the depth‑dependence of the magnetic signal is determined element‑specifically for the EuO and 3d FM partsof the bilayers. In connection with atomistic spin dynamics simulations, the thickness of the EuOlayer is found to be crucial, indicating that the observed antiferromagnetic proximity coupling is ashort‑ranged and genuine interface phenomenon. This fact turns the bilayer into a strong syntheticferrimagnet. The increase in magnetic order in EuO occurs in a finite spatial range and is thereforeparticularly strong in the 2D limit—a counterintuitive but very useful phenomenon for spin‑baseddevice applications.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-S (FS-PETRA-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. DFG project G:(GEPRIS)499348337 - Bilderhaltendes Spinpolarimeter für Impulsmikroskopie (499348337) (499348337)
4. SFB 1432 B02 - Die Bedeutung von Fluktuationen für magnetischen Transport (B02) (452823528) (452823528)
5. SFB 1432 B03 - Mikroskopische Untersuchungen von kritischen Spinfluktuationen in 2D Magneten (B03) (452823659) (452823659)

Experiment(s):

1. PETRA Beamline P22 (PETRA III)

Appears in the scientific report 2024

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