English  |  正體中文  |  简体中文  |  Post-Print筆數 : 11 |  Items with full text/Total items : 88837/118541 (75%)
Visitors : 23547974      Online Users : 604
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/80608


    Title: Anomalous Hall effect and current spin polarization in Co2FeX Heusler compounds (Z = Al, Ga, In, Si, Ge, and Sn): A systematic ab initio study
    Authors: Huang, Hung-Lung;Tung, Jen-Chuan;Guo, Guang-Yu
    董人銓;郭光宇
    Contributors: 應物所
    Date: 2015-04
    Issue Date: 2016-01-15 14:42:28 (UTC+8)
    Abstract: Co-based Heusler compounds are ferromagnetic with a high Curie temperature and a large magnetization density, and thus are promising for spintronic applications. In this paper, we perform a systematic ab initio study of two principal spin-related phenomena, namely, anomalous Hall effect and current spin polarization, in Co2-based Heusler compounds Co2FeX (X = Al, Ga, In, Si, Ge, Sn) in the cubic L2i structure within the density functional theory with the generalized gradient approximation (GGA). The accurate all-electron full-potential linearized augmented plane-wave method is used. First, we find that the spin polarization of the longitudinal current (PL) in Co2FeX (X = Al, Ga, In, Al0.5Si0.5, and Sn) is ∼100% even though that of the electronic states at the Fermi level (PD) is not. Further, the other compounds also have a high current spin polarization with PL > 85%. This indicates that all the Co2FeX compounds considered are promising for spin-transport devices. Interestingly, PD is negative in Co2FeX (X = Si, Ge, and Sn), differing in sign from the PL as well as that from the transport experiments. Second, the calculated anomalous Hall conductivities (AHCs) are moderate, being within 200 S/cm, and agree well with the available experiments on a highly L2, ordered Co2FeSi specimen although they differ significantly from the reported experiments on other compounds where the B2 antisite disorders were present. Surprisingly, the AHC in Co2FeSi decreases and then changes sign when Si is replaced by Ge and finally by Sn. Third, the calculated total magnetic moments agree well with the corresponding experimental ones in all the studied compounds except Co2FeSi where a difference of 0.3 μB /f.u. exists. We also perform the GGA plus on-site Coulomb interaction U calculations in the GGA+U scheme. We find that including the U affects the calculated total magnetic moment, spin polarization and AHC significantly, and in most cases, unfortunately, results in a disagreement with the available experimental results. All these interesting findings are discussed in terms of the underlying band structures.
    Relation: Physical Review B: Condensed Matter & Materials Physics, 91(13), 134409-1-134409-9
    Data Type: article
    DOI 連結: http://dx.doi.org/10.1103/PhysRevB.91.134409
    DOI: 10.1103/PhysRevB.91.134409
    Appears in Collections:[應用物理研究所 ] 期刊論文

    Files in This Item:

    File Description SizeFormat
    134409-1-134409-9.pdf326KbAdobe PDF602View/Open


    All items in 政大典藏 are protected by copyright, with all rights reserved.


    社群 sharing

    著作權政策宣告
    1.本網站之數位內容為國立政治大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,惟仍請適度,合理使用本網站之內容,以尊重著作權人之權益。商業上之利用,則請先取得著作權人之授權。
    2.本網站之製作,已盡力防止侵害著作權人之權益,如仍發現本網站之數位內容有侵害著作權人權益情事者,請權利人通知本網站維護人員(nccur@nccu.edu.tw),維護人員將立即採取移除該數位著作等補救措施。
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback