Ferromagnetism and piezomagnetic behavior in Mn-doped germanium nanotubes
Ferromagnetism and piezomagnetic behavior in Mn-doped germanium nanotubes
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DOI：
10.1103/physrevb.69.233406
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发表时间：
2004-06
影响因子：
3.7
通讯作者：
A. Singh;Vijay Kumar;Y. Kawazoe
中科院分区：
文献类型：
--
作者：
A. Singh;Vijay Kumar;Y. Kawazoe
利用从头算密度泛函计算，我们表明，五角和六角锗纳米管可以通过掺杂锰原子稳定在反棱柱结构。在这两种情况下，无限的纳米管都是金属和铁磁性的。到目前为止，在半导体的金属掺杂纳米管中，六角纳米管具有最高的平均磁矩，每Mn原子为3.06\phantom {\rule{0.3em}{0 ex}}{\ensuremath{\mu}}_{B}$，而五角纳米管在压缩时表现出从铁磁到亚铁磁状态的转变，磁矩发生突变，导致这些纳米管可能用作纳米压电磁体。
Using ab initio density functional calculations, we show that pentagonal and hexagonal nanotubes of Ge can be stabilized in the antiprism structure by doping with Mn atoms. In both cases the infinite nanotubes are metallic and ferromagnetic. Hexagonal nanotubes have the highest average magnetic moments of $3.06\phantom{\rule{0.3em}{0ex}}{\ensuremath{\mu}}_{B}$ per Mn atom found so far in metal doped nanotubes of semiconductors, while the pentagonal nanotubes show a transition from a ferromagnetic to a ferrimagnetic state upon compression with an abrupt change in the magnetic moments, leading to the possibility of these nanotubes to act as a nano-piezomagnet.