# Dry-transferred CVD graphene for inverted spin valve devices

**Authors:** Marc Drögeler, Luca Banszerus, Frank Volmer, Takashi Taniguchi, Kenji Watanabe, Bernd Beschoten, Christoph Stampfer  
**arXiv:** [1709.01364](https://arxiv.org/abs/1709.01364)  
**Date:** 2017-09-05  
**Summary page:** https://www.summarizepaper.com/en/paper/1709.01364v1/

## Key points

- Integrating high-mobility graphene grown by chemical vapor deposition (CVD) into spin transport devices is crucial in graphene spintronics.
- Researchers developed a novel approach using a van der Waals pickup technique to transfer CVD graphene by hexagonal boron nitride (hBN) onto predefined Co/MgO electrodes for building inverted spin valve devices.
- Two distinct methods were employed: patterning the CVD-graphene/hBN stack into a bar shape before transferring it onto spin valve electrodes and directly transferring the CVD-graphene/hBN stack.
- Record-high spin lifetimes in CVD graphene reaching up to 1.75 nanoseconds at room temperature were reported, comparable to those fabricated from exfoliated graphene.
- The success of these dry transfer methods holds promise for advancements in spintronic applications and opens up possibilities for developing more sophisticated device geometries.
- This innovative approach may prove instrumental in creating CVD-graphene-based nanoelectronic devices that require precise patterning prior to assembling final van der Waals heterostructures.
- The findings of this study were published in Applied Physics Letters under DOI 10.1063/1.5000545 and provide valuable insights for future research in the field of graphene-based spintronics and nanoelectronics.

## Summary

In the field of graphene spintronics, integrating high-mobility graphene grown by chemical vapor deposition (CVD) into spin transport devices is a crucial task. A group of researchers including Marc Drögeler, Luca Banszerus, Frank Volmer, Takashi Taniguchi, Kenji Watanabe, Bernd Beschoten, and Christoph Stampfer have developed a novel approach using a van der Waals pickup technique to transfer CVD graphene by hexagonal boron nitride (hBN) onto predefined Co/MgO electrodes for building inverted spin valve devices. Two distinct methods were employed in this study: the first involved patterning the CVD-graphene/hBN stack into a bar shape before transferring it onto spin valve electrodes using a larger hBN crystal; the second method entailed directly transferring the CVD-graphene/hBN stack. The researchers reported record-high spin lifetimes in CVD graphene reaching up to 1.75 nanoseconds at room temperature. Remarkably, the performance of these devices was found to be comparable to those fabricated from exfoliated graphene, demonstrating nanosecond spin lifetimes. The success of these dry transfer methods not only holds promise for advancements in spintronic applications but also opens up possibilities for developing more sophisticated device geometries. This innovative approach may prove instrumental in creating CVD-graphene-based nanoelectronic devices that require precise patterning prior to assembling final van der Waals heterostructures. The findings of this study were published in Applied Physics Letters under DOI 10.1063/1.5000545 and provide valuable insights for future research in the field of graphene-based spintronics and nanoelectronics.