Structural and magnetic characterization of Ge0.99Mn0.01 nanowire arrays

被引:37
作者
Kulkarni, JS
Kazakova, O
Erts, D
Morris, MA
Shaw, MT
Holmes, JD [1 ]
机构
[1] Natl Univ Ireland Univ Coll Cork, Dept Chem, Mat Sect & Supercrit Fluid Ctr, Cork, Ireland
[2] Natl Phys Lab, Teddington TW11 0LW, Middx, England
[3] Intel Ireland, Kildare, Ireland
[4] Latvian State Univ, Inst Chem Phys, LV-1586 Riga, Latvia
关键词
D O I
10.1021/cm050352a
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
A supercritical fluid inclusion-phase technique has been developed to embed Ge0.99Mn0.01 nanowires, with size-monodisperse diameters, within the pores of anodized aluminum oxide hosts. This article describes the synthesis and structural and magnetic characterization of these nanocomposite materials. The experimental results indicate the presence of both para- and ferromagnetic phases in Ge0.99Mn0.01 nanowires. Paramagnetism could be related to individual Mn atoms in the nanowire core. The ferromagnetic phase yields a high Curie temperature, T-c > 300 K, which is surprisingly high for this class of materials. Extended X-ray atomic fine structure (EXAFS) analysis confirmed that the ferromagnetism observed originates from the manganese atoms located at the nanowire-membrane interface.
引用
收藏
页码:3615 / 3619
页数:5
相关论文
共 38 条
[31]   Device physics - Magnetoelectronics [J].
Prinz, GA .
SCIENCE, 1998, 282 (5394) :1660-1663
[32]   Non-siliceous mesostructured and mesoporous materials [J].
Schüth, F .
CHEMISTRY OF MATERIALS, 2001, 13 (10) :3184-3195
[33]   Ferromagnetism above room temperature in bulk and transparent thin films of Mn-doped ZnO [J].
Sharma, P ;
Gupta, A ;
Rao, KV ;
Owens, FJ ;
Sharma, R ;
Ahuja, R ;
Guillen, JMO ;
Johansson, B ;
Gehring, GA .
NATURE MATERIALS, 2003, 2 (10) :673-677
[34]   Local structures of III-V diluted magnetic semiconductors Ga1-xMnxAs studied using extended x-ray-absorption fine structure [J].
Shioda, R ;
Ando, K ;
Hayashi, T ;
Tanaka, M .
PHYSICAL REVIEW B, 1998, 58 (03) :1100-1102
[35]   Spintronics:: A spin-based electronics vision for the future [J].
Wolf, SA ;
Awschalom, DD ;
Buhrman, RA ;
Daughton, JM ;
von Molnár, S ;
Roukes, ML ;
Chtchelkanova, AY ;
Treger, DM .
SCIENCE, 2001, 294 (5546) :1488-1495
[36]   Synthesis of ordered metallic nanowires inside ordered mesoporous materials through electroless deposition [J].
Zhang, ZT ;
Dai, S ;
Blom, DA ;
Shen, J .
CHEMISTRY OF MATERIALS, 2002, 14 (03) :965-+
[37]   Morphological control of highly ordered mesoporous silica SBA-15 [J].
Zhao, DY ;
Sun, JY ;
Li, QZ ;
Stucky, GD .
CHEMISTRY OF MATERIALS, 2000, 12 (02) :275-+
[38]   Conductive films of ordered nanowire arrays [J].
Ziegler, KJ ;
Polyakov, B ;
Kulkarni, JS ;
Crowley, TA ;
Ryan, KM ;
Morris, MA ;
Erts, D ;
Holmes, JD .
JOURNAL OF MATERIALS CHEMISTRY, 2004, 14 (04) :585-589