%0 Journal Article
%A Decker, R.
%A Bazarnik, M.
%A Atodiresei, N.
%A Caciuc, V.
%A Blügel, S.
%A Wiesendanger, R.
%T Local tunnel magnetoresistance of an iron intercalated graphene-based heterostructure
%J Journal of physics / Condensed matter
%V 26
%N 39
%@ 1361-648X
%C Bristol
%I IOP Publ.
%M FZJ-2014-04948
%P 394004
%D 2014
%X The lateral variation of the tunnel magnetoresistance (TMR) of a graphene-based vertical heterostructure is studied by spin-polarized scanning tunneling microscopy (SP–STM) using an Fe-coated probe tip. The well-defined heterostructure is obtained by the intercalation of a magnetic Fe monolayer at the graphene/Ir(1 1 1) interface. Its structure is characterized by a moiré pattern with a high corrugation. In contrast to the Fe / Ir(1 1 1) surface, graphene/Fe / Ir(1 1 1) exhibits ferromagnetic order with an out-of-plane easy magnetization axis. At the nanometer scale, our experiments reveal that the moiré pattern induces a lateral variation of the TMR, which reaches 80%. The measured TMR at valleys of the moiré pattern is higher than at hills. We interpret this modulation in terms of a different hybridization between graphene and Fe at valleys and hills due to a different graphene–Fe distance at these sites, which leads to a different transmission of spin-polarized states
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000343313400006
%R 10.1088/0953-8984/26/39/394004
%U https://juser.fz-juelich.de/record/156053