TY  - JOUR
AU  - Drögeler, Marc
AU  - Banszerus, Luca
AU  - Volmer, Frank
AU  - Taniguchi, Takashi
AU  - Watanabe, Kenji
AU  - Beschoten, Bernd
AU  - Stampfer, Christoph
TI  - Dry-transferred CVD graphene for inverted spin valve devices
JO  - Applied physics letters
VL  - 111
IS  - 15
SN  - 1077-3118
CY  - Melville, NY
PB  - American Inst. of Physics
M1  - FZJ-2020-02434
SP  - 152402 -
PY  - 2017
AB  - Integrating high-mobility graphene grown by chemical vapor deposition (CVD) into spin transport devices is one of the key tasks in graphene spintronics. We use a van der Waals pick-up technique to transfer CVD graphene by hexagonal boron nitride (hBN) from the copper growth substrate onto predefined Co/MgO electrodes to build inverted spin valve devices. Two approaches are presented: (i) a process where the CVD-graphene/hBN stack is first patterned into a bar and then transferred by a second larger hBN crystal onto spin valve electrodes and (ii) a direct transfer of a CVD-graphene/hBN stack. We report record high spin lifetimes in CVD graphene of up to 1.75 ns at room temperature. Overall, the performances of our devices are comparable to devices fabricated from exfoliated graphene also revealing nanosecond spin lifetimes. We expect that our dry transfer methods pave the way towards more advanced device geometries not only for spintronic applications but also for CVD-graphene-based nanoelectronic devices in general where patterning of the CVD graphene is required prior to the assembly of final van der Waals heterostructures.We acknowledge funding from the European Union Seventh Framework Programme under Grant Agreement No. 604391 Graphene Flagship and the Deutsche Forschungsgemeinschaft (BE 2441/9-1) and support by the Helmholtz Nano Facility (HNF)36 at the Forschungszentrum Jülich. Growth of hexagonal boron nitride crystals was supported by the Elemental Strategy Initiative conducted by the MEXT, Japan and JSPS KAKENHI Grant Nos. JP26248061, JP15K21722, and JP25106006.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000413196100019
DO  - DOI:10.1063/1.5000545
UR  - https://juser.fz-juelich.de/record/877737
ER  -