Tunnel spin injection into graphene using Al2O3 barrier grown by atomic layer deposition on functionalized graphene surface

✍ Scribed by Takehiro Yamaguchi; Satoru Masubuchi; Kazuyuki Iguchi; Rai Moriya; Tomoki Machida

• Book ID: 113725165
• Publisher: Elsevier Science
• Year: 2012
• Tongue: English
• Weight: 346 KB
• Volume: 324
• Category: Article
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2011.09.031

✦ Synopsis

We demonstrate electrical tunnel spin injection from a ferromagnet to graphene through a high-quality Al2O3 grown by atomic layer deposition (ALD). The graphene surface is functionalized with a self-assembled monolayer of 3,4,9,10-perylene tetracarboxylic acid (PTCA) to promote adhesion and growth of Al2O3 with a smooth surface. Using this composite tunnel barrier of ALD-Al2O3 and PTCA, a spin injection signal of ∼30Ω has been observed from non-local magnetoresistance measurements at 45K, revealing potentially high performance of ALD-Al2O3/PTCA tunnel barrier for spin injection into graphene.