Graphene-based synthetic antiferromagnets and ferrimagnets

P. Gargiani (), R. Cuadrado, H. B. Vasili, M. Pruneda and M. Valvidares ()
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P. Gargiani: ALBA Synchrotron Light Source
R. Cuadrado: Campus UAB
H. B. Vasili: ALBA Synchrotron Light Source
M. Pruneda: Campus UAB
M. Valvidares: ALBA Synchrotron Light Source

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Graphene-spaced magnetic systems with antiferromagnetic exchange-coupling offer exciting opportunities for emerging technologies. Unfortunately, the in-plane graphene-mediated exchange-coupling found so far is not appropriate for realistic exploitation, due to being weak, being of complex nature, or requiring low temperatures. Here we establish that ultra-thin Fe/graphene/Co films grown on Ir(111) exhibit robust perpendicular antiferromagnetic exchange-coupling, and gather a collection of magnetic properties well-suited for applications. Remarkably, the observed exchange coupling is thermally stable above room temperature, strong but field controllable, and occurs in perpendicular orientation with opposite remanent layer magnetizations. Atomistic first-principles simulations provide further ground for the feasibility of graphene-spaced antiferromagnetic coupled structures, confirming graphene’s direct role in sustaining antiferromagnetic superexchange-coupling between the magnetic films. These results provide a path for the realization of graphene-based perpendicular synthetic antiferromagnetic systems, which seem exciting for fundamental nanoscience or potential use in spintronic devices.

Date: 2017
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DOI: 10.1038/s41467-017-00825-9

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