TY  - JOUR
AU  - Decker, R.
AU  - Bazarnik, M.
AU  - Atodiresei, N.
AU  - Caciuc, V.
AU  - Blügel, S.
AU  - Wiesendanger, R.
TI  - Local tunnel magnetoresistance of an iron intercalated graphene-based heterostructure
JO  - Journal of physics / Condensed matter
VL  - 26
IS  - 39
SN  - 1361-648X
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2014-04948
SP  - 394004
PY  - 2014
AB  - 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
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000343313400006
DO  - DOI:10.1088/0953-8984/26/39/394004
UR  - https://juser.fz-juelich.de/record/156053
ER  -