铒单离子磁体(C18H23Er)器件的自旋极化输运

doi:10.7523/j.issn.2095-6134.2018.03.003

中国科学院大学学报 ›› 2018, Vol. 35 ›› Issue (3): 302-307.DOI: 10.7523/j.issn.2095-6134.2018.03.003

铒单离子磁体(C₁₈H₂₃Er)器件的自旋极化输运

周洁, 王正川

中国科学院大学物理科学学院, 北京 100049

收稿日期:2017-03-02 修回日期:2017-04-11 发布日期:2018-05-15
通讯作者: 王正川
基金资助:
国家自然科学基金（11274378）和973项目（2013CB933401）资助

Spin-polarized transport through a device of single-ion magnet C₁₈H₂₃Er

ZHOU Jie, WANG Zhengchuan

School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-03-02 Revised:2017-04-11 Published:2018-05-15

摘要/Abstract

摘要： 研究单分子磁体的自旋极化输运性质。搭建由扫描隧道显微镜钴针尖、铒单离子磁体以及金（111）衬底所构成的分子器件模型。在小偏压下，计算铒单离子磁体在正立和倒立2种构型下的自旋极化电流曲线，发现此单分子磁体器件的隧穿磁电阻最高达120%，自旋过滤效率在70%~100%。对比2种构型下的整流比，发现倒立构型有较大的整流比。通过分析体系的透射谱、分子投影哈密顿量、器件投影态密度等，对上述物理效应的根源进行解释。

关键词: 单离子磁体, 自旋过滤, 自旋整流, 隧穿磁电阻效应

Abstract: We study the spin-polarized transport through devices of single molecule magnet. A device consisting of the scanning tunneling microscopy Co tip, the single-ion magnet of erbium, and the Au(111) substrate is set up. We calculate the spin-polarized I-V curves for the upward and downward structures of single-ion magnet at a small bias, and find that the tunnel magnetoresistance is as high as 120% and the efficiency of the spin filter at small bias is between 70%-100%. By comparing the spin rectification ratios of the two structures, we find that the downward structure has better spin rectifying effect. Based on the analyses of the transmission spectrum, the molecular projection Hamiltonian, and the projection device density of states, we give reasonable explainations for the above observations.

Key words: single-ion magnet, spin filter, spin rectification, tunnel magnetoresistance

中图分类号:

周洁, 王正川. 铒单离子磁体(C₁₈H₂₃Er)器件的自旋极化输运[J]. 中国科学院大学学报, 2018, 35(3): 302-307.

ZHOU Jie, WANG Zhengchuan. Spin-polarized transport through a device of single-ion magnet C₁₈H₂₃Er[J]. , 2018, 35(3): 302-307.

参考文献

[1] Wolf S A, Awschalom D D, Buhrman R A, et al. Spintronics:a spin-based electronics vision for the future[J]. Science, 2001, 294(5546):1488-1495.
[2] Zutic I, Fabian J, Sarma S D. Spintronics:fundamentals and applications[J]. Reviews of Modern Physics, 2004, 76(2):323-410.
[3] Baibich M N, Broto J M, Fert A, et al. Giant magnetoresistance of (001)Fe/(001) Cr magnetic superlattices[J].Physical Review Letters, 1988, 61(21):2472-2475.
[4] Butler W H, Zhang X G, Schulthess T C. Spin-dependent tunneling conductance of Fe|MgO|Fe sandwiches[J]. Physical Review B, 2001, 63(5):054416.
[5] Yang Z, Wang D H, Liu X G, et al. Magnetic and quantum transport properties of small-sized transition-metal-pentalene sandwich cluster[J]. The Journal of Physical Chemistry C, 2014, 118(51):29695-29703.
[6] Heurich J, Cuevas J C, Wenzel W, et al. Electrical transport through single-molecule junctions:from molecular orbitals to conduction channels[J]. Physical Review Letters, 2002, 88(25):256803.
[7] Heersche H B, Groot Z D, Folk J A, et al. Electron transport through single Mn₁₂ molecular magnets[J]. Physical Review Letters, 2006, 96(20):206801.
[8] Bogani L, Wernsdorfer W. Molecular spintronics using single-molecule magnets[J]. Nature Materials, 2008, 7:179-186.
[9] Emberly E G, George K. Molecular spintronics:spin-dependent electron transport in molecular wires[J]. Chemical Physics, 2002, 281(2/3):311-324.
[10] Callsen M, Caciuc V, Kiselev N, et al. Magnetic hardening induced by nonmagnetic organic molecules[J]. Physical Review Letters, 2013, 111(10):106805.
[11] Dong Y J, Wang X F, Yang S W, et al. High performance current and spin diode of atomic carbon chain between transversely symmetric ribbon electrodes[J]. Scientific Reports, 2014, 4:6157.
[12] Cheng Z H, Du S X, Jiang N, et al. High resolution scanning-tunneling-microscopy imaging of individual molecular orbitals by eliminating the effect of surface charge[J]. Surface Science, 2011, 605(3/4):415-418.
[13] Repp J, Meyer G. Molecules on insulating films:scanning-tunneling microscopy imaging of individual molecular orbitals[J]. Physical Review Letters, 2005, 94(2):026803.
[14] Wang Y F, Wu K, Jörg K, et al. Review article:structures of phthalocyanine molecules on surfaces studied by STM[J]. AIP Advances, 2012, 2(4):041402.
[15] Sessoli R, Gatteschi D, Caneschi A, et al. Magnetic bistability in a metal-ion cluster[J]. Nature, 1993, 356:141-143.
[16] Gatteschi D, Caneschi A, Pardi L, et al. Large clusters of metal ions:the transition from molecular to bulk magnets[J]. Science, 1994, 265(5175):1054.
[17] Liao M S, Steve S. Electronic structure and bonding in metal phthalocyanines, Metal=Fe,Co,Ni,Cu,Zn,Mg[J]. Chemical Physics, 2001, 114(22):9780-9791.
[18] Hsu C H, Chu Y H, Lu C, et al. Spin-polarized transport through single manganese phthalocyanine molecules on a Co nanoisland[J]. Journal of Physical Chemistry C, 2015, 119:3374-3378.
[19] Gao L, Ji W, Hu Y B, et al. Site-specific kondo effect at ambient temperatures in iron-based molecules[J]. Physical Review Letters, 2007, 99(10):106402.
[20] Zhang Y, Liao P, Kan J, et al. Low-temperature scanning tunneling microscopy study on the electronic properties of a double-decker DyPc2 molecule at the surface[J]. Physical Chemistry Chemical Physics, 2015, 17(40):27019-27026.
[21] Jiang S D, Liu S S, Zhou L N, et al. Series of lanthanide organometallic single-ion magnets[J]. Inorganic Chemistry, 2012, 51(5):3079-3087.
[22] Meng Y S, Wang C H, Zhang Y Q, et al. (Boratabenzene)(cyclooctatetraenyl) lanthanide complexes:a new type of organometallic single-ion magnet[J]. Inorganic Chemistry, 2016, 3(6):828-835.
[23] Kresse G, Furthmuller J. Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set[J]. Physical Review B, 1996, 54(16):11169-11186.
[24] Brandbyge M, Mozos J L, Ordejón P, et al. Density-functional method for nonequilibrium electron transport[J]. Physical Review B, 2002, 65(16):165401.
[25] Stokbro K, Petersen D E, Smidstrup S, et al. Semiempirical model for nanoscale device simulations[J]. Physical Review B, 2010, 82(7):075420.
[26] Stokbro K, Taylor J, Brandbyge M, et al. Theoretical study of the nonlinear conductance of Di-thiol benzene coupled to Au(111) surfaces via thiol and thiolate bonds[J]. Computational Materials Science, 2003, 27(1/2):151-160.

铒单离子磁体(C₁₈H₂₃Er)器件的自旋极化输运

Spin-polarized transport through a device of single-ion magnet C₁₈H₂₃Er

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