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Half metal in two-dimensional hexagonal organometallic framework.

Hu H, Wang Z, Liu F - Nanoscale Res Lett (2014)

Bottom Line: Two-dimensional (2D) hexagonal organometallic framework (HOMF) made of triphenyl-metal molecules bridged by metal atoms has been recently shown to exhibit exotic electronic properties, such as half-metallic and topological insulating states.The HOMFs show both ferromagnetic and antiferromagnetic properties, as well as nonmagnetic properties, due to the electronic configuration of the TM atoms.The V, Mn, and Fe lattices are ferromagnetic half metals with a large band gap of more than 1.5 eV in the insulating spin channel, making them potential 2D materials for spintronics application.

View Article: PubMed Central - PubMed

Affiliation: Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, 710054, China, hhu0914@mail.xjtu.edu.cn.

ABSTRACT
Two-dimensional (2D) hexagonal organometallic framework (HOMF) made of triphenyl-metal molecules bridged by metal atoms has been recently shown to exhibit exotic electronic properties, such as half-metallic and topological insulating states. Here, using first-principles calculations, we investigate systematically the structural, electronic, and magnetic properties of such HOMFs containing 3d transition metal (TM) series (Sc to Cu). Two types of structures are found for these HOMFs: a buckled structure for those made of TMs with less half-filled 3d band and a twisted structure otherwise. The HOMFs show both ferromagnetic and antiferromagnetic properties, as well as nonmagnetic properties, due to the electronic configuration of the TM atoms. The V, Mn, and Fe lattices are ferromagnetic half metals with a large band gap of more than 1.5 eV in the insulating spin channel, making them potential 2D materials for spintronics application.

No MeSH data available.


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Schematic illustration of a HOMF-graphene-HOMF spintronic device.
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Fig5: Schematic illustration of a HOMF-graphene-HOMF spintronic device.

Mentions: The DFT band gaps for the insulating spin channel of these half-metallic 2D HOMFs are more than 1.5 eV, making them ideal spin-injection or spin-detection materials. Another important component of a spintronic device is a spin conductor (or carrier) which transports spin as fast and as long as possible. Graphene has been proposed as an ideal 2D spin conductor because of its small SOC and long spin-coherence length[27, 28]. Considering both the 2D nature of HOMF and graphene, and high bonding compatibility of molecular ligands in HOMF with graphene, we propose an attractive design of spintronic devices built from two HOMF-graphene-HOMF heterojunctions as shown in Figure 5. On the left side, half-metallic HOMF is used as spin injector and one the right as spin detector; while the graphene works as the spin conductor in the middle. The transport properties, as well as functionality of such devices, will be interesting topics for future studies.Figure 5


Half metal in two-dimensional hexagonal organometallic framework.

Hu H, Wang Z, Liu F - Nanoscale Res Lett (2014)

Schematic illustration of a HOMF-graphene-HOMF spintronic device.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493848&req=5

Fig5: Schematic illustration of a HOMF-graphene-HOMF spintronic device.
Mentions: The DFT band gaps for the insulating spin channel of these half-metallic 2D HOMFs are more than 1.5 eV, making them ideal spin-injection or spin-detection materials. Another important component of a spintronic device is a spin conductor (or carrier) which transports spin as fast and as long as possible. Graphene has been proposed as an ideal 2D spin conductor because of its small SOC and long spin-coherence length[27, 28]. Considering both the 2D nature of HOMF and graphene, and high bonding compatibility of molecular ligands in HOMF with graphene, we propose an attractive design of spintronic devices built from two HOMF-graphene-HOMF heterojunctions as shown in Figure 5. On the left side, half-metallic HOMF is used as spin injector and one the right as spin detector; while the graphene works as the spin conductor in the middle. The transport properties, as well as functionality of such devices, will be interesting topics for future studies.Figure 5

Bottom Line: Two-dimensional (2D) hexagonal organometallic framework (HOMF) made of triphenyl-metal molecules bridged by metal atoms has been recently shown to exhibit exotic electronic properties, such as half-metallic and topological insulating states.The HOMFs show both ferromagnetic and antiferromagnetic properties, as well as nonmagnetic properties, due to the electronic configuration of the TM atoms.The V, Mn, and Fe lattices are ferromagnetic half metals with a large band gap of more than 1.5 eV in the insulating spin channel, making them potential 2D materials for spintronics application.

View Article: PubMed Central - PubMed

Affiliation: Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, 710054, China, hhu0914@mail.xjtu.edu.cn.

ABSTRACT
Two-dimensional (2D) hexagonal organometallic framework (HOMF) made of triphenyl-metal molecules bridged by metal atoms has been recently shown to exhibit exotic electronic properties, such as half-metallic and topological insulating states. Here, using first-principles calculations, we investigate systematically the structural, electronic, and magnetic properties of such HOMFs containing 3d transition metal (TM) series (Sc to Cu). Two types of structures are found for these HOMFs: a buckled structure for those made of TMs with less half-filled 3d band and a twisted structure otherwise. The HOMFs show both ferromagnetic and antiferromagnetic properties, as well as nonmagnetic properties, due to the electronic configuration of the TM atoms. The V, Mn, and Fe lattices are ferromagnetic half metals with a large band gap of more than 1.5 eV in the insulating spin channel, making them potential 2D materials for spintronics application.

No MeSH data available.


Related in: MedlinePlus