Phys. Rev. B 75, 235415 (2007) [7 pages]Spin-dependent transport in Fe-doped carbon nanotubesReceived 17 January 2007; revised 11 April 2007; published 12 June 2007 We report on a first principles calculation of spin-dependent quantum transport in Fe-doped single-wall carbon nanotube (CNT) junctions. For junctions of a pristine (9,0) CNT in contact with Fe-doped (9,0) CNT leads, the total current in parallel configuration of the moment is larger than that of antiparallel configuration under lower bias voltage. For higher bias voltages the opposite happens. A tunnel magnetoresistance ration as large as 40% is found at zero bias, it decays with bias, and eventually goes to negative values at larger bias. Similar results are obtained for junctions with pristine (10,0), (8,0) CNT in contact with Fe-doped (10,0) or (8,0) CNT leads. The spin-dependent transport features can be understood by analyzing microscopic details of the transmission coefficients. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.235415
DOI:
10.1103/PhysRevB.75.235415
PACS:
72.15.Jf, 85.65.+h, 73.40.Cg, 71.15.Mb
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.