title: Giant tunnel magneto-resistance in graphene based molecular tunneling junction.
abstract: We propose and theoretically investigate a class of stable zigzag graphene nanoribbon (ZGNR) based molecular magnetic tunneling junctions (MTJs). For those junctions having pentagon-connecting formations, huge tunnel magneto-resistance (TMR) is found. Different from most of the other proposed molecular junctions, the huge TMR in our structures is generic, and is not significantly affected by external parameters such as bias voltage, gate voltage, length of the molecule and width of the ZGNRs. The double pentagon-connecting formation between the molecule and ZGNRs is critical for the remarkable TMR ratio, which is as large as ∼2 × 10(5). These molecular MTJs behave as almost perfect spin filters and spin valve devices. Other connecting formations of the ZGNR based MTJs lead to much smaller TMR. By first principles analysis, we reveal the microscopic physics responsible for this phenomenon.
authors.affiliation: College of Physics Science and Technology, Shenzhen University, Shen-zhen, 518060, China. ywei@szu.edu.cn.
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Jianwei
authors.initials: J
authors.lastname: Li
authors.forename: Yunjin
authors.initials: Y
authors.lastname: Yu
authors.forename: Yadong
authors.initials: Y
authors.lastname: Wei
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Hong
authors.initials: H
authors.lastname: Guo