Size-dependent alternation of magnetoresistive properties in atomic chains

被引：10
作者：
Durgun, E. [1 ]
Senger, R. T.
Mehrez, H.
Sevincli, H.
Ciraci, S.
机构：
[1] Bilkent Univ, Dept Phys, TR-06800 Ankara, Turkey
[2] NASA, Ames Res Ctr, Ctr Nanotechnol, Moffett Field, CA 94035 USA
[3] NASA, Ames Res Ctr, NASA Supercomp Div, Moffett Field, CA 94035 USA
来源：
JOURNAL OF CHEMICAL PHYSICS | 2006年 / 125卷 / 12期
关键词：
D O I：
10.1063/1.2354080
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Spin-polarized electronic and transport properties of carbon atomic chains are investigated when they are capped with magnetic transition-metal (TM) atoms like Cr or Co. The magnetic ground state of the TM-C-n-TM chains alternates between the ferromagnetic (F) and antiferromagnetic (AF) spin configurations as a function of n. In view of the nanoscale spintronic device applications the desirable AF state is obtained for only even-n chains with Cr; conversely only odd-n chains with Co have AF ground states. When connected to appropriate metallic electrodes these atomic chains display a strong spin-valve effect. Analysis of structural, electronic, and magnetic properties of these atomic chains, as well as the indirect exchange coupling of the TM atoms through non-magnetic carbon atoms are presented. (c) 2006 American Institute of Physics.
引用
收藏
页数：4
相关论文
共 31 条
[21]   Spin and molecular electronics in atomically generated orbital landscapes -: art. no. 085414 [J].
Rocha, AR ;
García-Suárez, VM ;
Bailey, S ;
Lambert, C ;
Ferrer, J ;
Sanvito, S .
PHYSICAL REVIEW B, 2006, 73 (08)
[22]   Towards molecular spintronics [J].
Rocha, AR ;
García-Suárez, VM ;
Bailey, SW ;
Lambert, CJ ;
Ferrer, J ;
Sanvito, S .
NATURE MATERIALS, 2005, 4 (04) :335-339
[23]   On the way to heptahexaenylidene complexes: Trapping of an intermediate with the novel M=C=C=C=C=C=C=CR(2) moiety [J].
Roth, G ;
Fischer, H .
ORGANOMETALLICS, 1996, 15 (26) :5766-5768
[24]   First-principles investigation of spin-polarized conductance in atomic carbon wires [J].
Senapati, L ;
Pati, R ;
Mailman, M ;
Nayak, SK .
PHYSICAL REVIEW B, 2005, 72 (06)
[25]   Carbon string structures: First-principles calculations of quantum conductance [J].
Senger, RT ;
Tongay, S ;
Dag, S ;
Durgun, E ;
Ciraci, S .
PHYSICAL REVIEW B, 2005, 71 (23)
[26]   The SIESTA method for ab initio order-N materials simulation [J].
Soler, JM ;
Artacho, E ;
Gale, JD ;
García, A ;
Junquera, J ;
Ordejón, P ;
Sánchez-Portal, D .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2002, 14 (11) :2745-2779
[27]   Atomic and electronic structure of carbon strings [J].
Tongay, S ;
Dag, S ;
Durgun, E ;
Senger, RT ;
Ciraci, S .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2005, 17 (25) :3823-3836
[28]   Ab-initio electron transport calculations of carbon based string structures -: art. no. 136404 [J].
Tongay, S ;
Senger, RT ;
Dag, S ;
Ciraci, S .
PHYSICAL REVIEW LETTERS, 2004, 93 (13) :136404-1
[29]   SOFT SELF-CONSISTENT PSEUDOPOTENTIALS IN A GENERALIZED EIGENVALUE FORMALISM [J].
VANDERBILT, D .
PHYSICAL REVIEW B, 1990, 41 (11) :7892-7895
[30]   Spin-valve effect in a carbon atomic wire [J].
Wei, YH ;
Xu, Y ;
Wang, J ;
Guo, H .
PHYSICAL REVIEW B, 2004, 70 (19)
1234