线性磁性分子离子中由激光诱导的超快自旋转移

李春; 张少斌; 金蔚; Georgios Lefkidis; Wolfgang Hübner

doi:10.7498/aps.61.177502

摘要

通过由激光诱导的Λ进程,很多分子磁性体系中涉及的退磁、自旋翻转或自旋转移过程在理论上得以实现.本文针对具有线性构型的磁性分子离子, 应用量子化学从头计算与自编程序相结合的方法,实现了具有线性构型的双磁性中心分子体系 [Fe-O-Co]+中基于Λ进程的超快自旋转移,且电子占据的转移率达到90%以上. 本文的理论研究结果表明,采用改变磁场方向的方法来增强体系的磁晶各向异性, 可以避免为提高自旋转移能力而额外增加桥接原子在实际应用中的复杂性, 同时也可明显提高电子占据的转移率.

关键词:

Abstract

The demagnetization, spin switching, and spin transfer in magnetic molecular systems can be theoretically achieved via the laser-induced Λ process. In the present work, both quantum chemistry ab initio calculations and our self-written programs are adopted to investigate the spin-transfer behavior of the magnetic molecular ions with linear configuration. It is shown for the first time that the Λ process based ultrafast spin transfer can be achieved in a linear two-magnetic-center molecular ion [Fe-O-Co]+, and the fidelity of the population transfer exceeds 90%. The present theoretical prediction shows that the magnetocrystalline anisotropy of a molecular system can be enhanced by properly adjusting the direction of the applied magnetic field, which is shown to be a better way to improve the spin-transfer ability of the molecular system than by increasing additional bridging atoms since it could avoid the complexity of the latter situation in practical applications. At the same time, the present spin-transfer scenario indicates that the fidelity of the population transfer could also be evidently increased.

Keywords:

作者及机构信息

1.
西北工业大学力学与土木建筑学院, 西安 710072;

2.
德国凯泽斯劳滕工业大学物理系和OPTIMAS研究中心, 凯泽斯劳滕 67653

基金项目: 国家自然科学基金(批准号: 11002109);高等学校博士学科点专项科研基金(批准号: 20106102120028); 西北工业大学基础研究基金和"翱翔之星"计划资助的课题.

Authors and contacts

1.
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China;

2.
Department of Physics and Research Center OPTIMAS, Kaiserslautern University of Technology, 67653 Kaiserslautern, Germany

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11002109), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20106102120028), the NPU Foundation for Fundamental Research, and the NPU Ao-Xiang Star Project.

参考文献

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[2]	Koopmans B, Ruigrok J J M, Dalla Longa F, de Jonge W J M 2005 Phys. Rev. Lett. 95 267207
[3]	Chovan J, Kavousanaki E G, Perakis I E 2006 Phys. Rev. Lett. 96 057402
[4]	Koopmans B, Malinowski J, Dalla Longa F, Steiauf D, Fähnle M, Roth T, Cinchetti M, Aeschlimann M 2010 Nat. Mater. 9 259
[5]	Zhang G P, Hübner W, Lefkidis G, Bai Y, George T F 2009 Nat. Phys. 5 499
[6]	Bigot J Y, Vomir M, Beaurepaire E 2009 Nat. Phys. 5 515
[7]	Boeglin C, Beaurepaire E, Halté V, López-Flores V, Stamm C, Pontius N, Dürr H A, Bigot J Y 2010 Nature 465 458
[8]	Guo L J, Wüstenberg J P, Oleksiy A, Bauer M, Aeschlimann M 2005 Acta Phys. Sin. 54 3200 (in Chinese) [郭立俊, Jan-Peter Wüstenberg, Andreyev Oleksiy, Michael Bauer, Martin Aeschlimann 2005 54 3200]
[9]	Sukhov A, Berakdar J 2009 Phys. Rev. Lett. 102 057204
[10]	Atxitia U, Chubykalo-Fesenko O, Chantrell R W, Nowak U, Rebei A 2009 Phys. Rev. Lett. 102 057203
[11]	Hübner W, Zhang G P 1998 Phys. Rev. B 58 R5920
[12]	Zhang G P, Hübner W 2000 Phys. Rev. Lett. 85 3025
[13]	Gómez-Abal R, Ney O, Satitkovitchai K, Hübner W 2004 Phys. Rev. Lett. 92 227402
[14]	Shen Y R, Bloembergen N 1966 Phys. Rev. 143 372
[15]	Lefkidis G, Hübner W 2007 Phys. Rev. B 76 014418
[16]	Li C, Hartenstein T, Lefkidis G, Hübner W 2009 Phys. Rev. B 79 180413(R)
[17]	Hartenstein T, Li C, Lefkidis G, Hübner W 2008 J. Phys. D: Appl. Phys. 41 164006
[18]	Lefkidis G, Zhang G P, Hübner W 2009 Phys. Rev. Lett. 103 217401
[19]	Lefkidis G, Li C, Pal G, Blug M, Kelm H, Krüger H J, Hübner W 2011 J. Phys. Chem. A 115 1774
[20]	Hübner W, Kersten S P, Lefkidis G 2009 Phys. Rev. B 79 184431
[21]	Li C, Yang F, Lefkidis G, Hübner W 2011 Acta Phys. Sin. 60 017802 (in Chinese) [李春, 杨帆, Georgios Lefkidis, Wolfgang Hübner 2011 60 017802]
[22]	Li C, Zhang S, Jin W, Xiang H, Lefkidis G, Hübner W 2012 J. Magn. Magn. Mater. http: // dx.doi.org/ 10.1016/ j.jmmm. 2012. 07.007
[23]	Li C, Jin W, Xiang H, Lefkidis G, Hübner W 2011 Phys. Rev. B 84 054415
[24]	Frisch M J 2004 Gaussian 03 Revision B.03 gaussian Inc. (Wallingford CT)
[25]	Nakatsuji H 1979 Chem. Phys. Lett. 67 329

施引文献

[1]	Beaurepaire E, Merle J C, Daunois A, Bigot J Y 1996 Phys. Rev. Lett. 76 4250
[2]	Koopmans B, Ruigrok J J M, Dalla Longa F, de Jonge W J M 2005 Phys. Rev. Lett. 95 267207
[3]	Chovan J, Kavousanaki E G, Perakis I E 2006 Phys. Rev. Lett. 96 057402
[4]	Koopmans B, Malinowski J, Dalla Longa F, Steiauf D, Fähnle M, Roth T, Cinchetti M, Aeschlimann M 2010 Nat. Mater. 9 259
[5]	Zhang G P, Hübner W, Lefkidis G, Bai Y, George T F 2009 Nat. Phys. 5 499
[6]	Bigot J Y, Vomir M, Beaurepaire E 2009 Nat. Phys. 5 515
[7]	Boeglin C, Beaurepaire E, Halté V, López-Flores V, Stamm C, Pontius N, Dürr H A, Bigot J Y 2010 Nature 465 458
[8]	Guo L J, Wüstenberg J P, Oleksiy A, Bauer M, Aeschlimann M 2005 Acta Phys. Sin. 54 3200 (in Chinese) [郭立俊, Jan-Peter Wüstenberg, Andreyev Oleksiy, Michael Bauer, Martin Aeschlimann 2005 54 3200]
[9]	Sukhov A, Berakdar J 2009 Phys. Rev. Lett. 102 057204
[10]	Atxitia U, Chubykalo-Fesenko O, Chantrell R W, Nowak U, Rebei A 2009 Phys. Rev. Lett. 102 057203
[11]	Hübner W, Zhang G P 1998 Phys. Rev. B 58 R5920
[12]	Zhang G P, Hübner W 2000 Phys. Rev. Lett. 85 3025
[13]	Gómez-Abal R, Ney O, Satitkovitchai K, Hübner W 2004 Phys. Rev. Lett. 92 227402
[14]	Shen Y R, Bloembergen N 1966 Phys. Rev. 143 372
[15]	Lefkidis G, Hübner W 2007 Phys. Rev. B 76 014418
[16]	Li C, Hartenstein T, Lefkidis G, Hübner W 2009 Phys. Rev. B 79 180413(R)
[17]	Hartenstein T, Li C, Lefkidis G, Hübner W 2008 J. Phys. D: Appl. Phys. 41 164006
[18]	Lefkidis G, Zhang G P, Hübner W 2009 Phys. Rev. Lett. 103 217401
[19]	Lefkidis G, Li C, Pal G, Blug M, Kelm H, Krüger H J, Hübner W 2011 J. Phys. Chem. A 115 1774
[20]	Hübner W, Kersten S P, Lefkidis G 2009 Phys. Rev. B 79 184431
[21]	Li C, Yang F, Lefkidis G, Hübner W 2011 Acta Phys. Sin. 60 017802 (in Chinese) [李春, 杨帆, Georgios Lefkidis, Wolfgang Hübner 2011 60 017802]
[22]	Li C, Zhang S, Jin W, Xiang H, Lefkidis G, Hübner W 2012 J. Magn. Magn. Mater. http: // dx.doi.org/ 10.1016/ j.jmmm. 2012. 07.007
[23]	Li C, Jin W, Xiang H, Lefkidis G, Hübner W 2011 Phys. Rev. B 84 054415
[24]	Frisch M J 2004 Gaussian 03 Revision B.03 gaussian Inc. (Wallingford CT)
[25]	Nakatsuji H 1979 Chem. Phys. Lett. 67 329

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