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2017 ; 8
(1
): 699
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Graphene-based synthetic antiferromagnets and ferrimagnets
#MMPMID28951545
Gargiani P
; Cuadrado R
; Vasili HB
; Pruneda M
; Valvidares M
Nat Commun
2017[Sep]; 8
(1
): 699
PMID28951545
show ga
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.Antiferromagnetic spintronics may pave the way to innovative information
storage devices with perpendicular coupling, however experimental demonstrations
are still sparse. Here, the authors demonstrate a graphene-mediated perpendicular
antiferromagnetic coupling between Fe and Co layers in a Fe/graphene/Co sandwich
structure.