We study via first-principles modeling and simulation two-dimensional spintronic junctions made of metalorganic frameworks consisting of two Mn-phthalocyanine ferromagnetic metal leads and semiconducting Ni-phthalocyanine channels of various lengths. These systems exhibit a large tunneling magnetoresistance ratio; the transmission functions of such junctions can be tuned using gate voltage by three orders of magnitude. We find that the origin of this drastic change lies in the orbital alignment and hybridization between the leads and the center electronic states. With physical insight into the observed on-off phenomenon, we predict a gate-controlled spin current switch based on two-dimensional crystallines and offer general guidelines for designing spin junctions using 2D materials.
机构:
Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R ChinaChinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
Xu, Jiyu
Meng, Sheng
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机构:
Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R ChinaChinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China