Giant magnetoresistance of multiwall carbon nanotubes: modeling the tube/ferromagnetic-electrode burying contact
Giant magnetoresistance of multiwall carbon nanotubes: modeling the tube/ferromagnetic-electrode burying contact
复制标题
多壁碳纳米管的巨磁阻：模拟管/铁磁电极埋入接触
DOI：
10.1103/physrevb.69.155423
复制
发表时间：
2004
影响因子：
3.7
通讯作者：
G. Cuniberti
中科院分区：
文献类型：
--
作者：
S. Krompiewski;R. Gutierrez;G. Cuniberti
报道了超小直径多壁碳纳米管的巨磁电阻效应。特别地，我们考虑了壁间相互作用和铅/纳米管耦合的影响。已经进行了比较研究，以表明在所有壁都很好地耦合到电极的情况下，可以出现所谓的逆GMR。负GMR的趋势取决于壁间相互作用和纳米管长度。然而，如果内部纳米管不与电极之一接触，则即使对于相对强的壁间相互作用，GMR也保持为正，而不管外部纳米管长度如何。这些结果进一步阐明了最近报道的实验数据，其中在一些多壁碳纳米管样品中发现了逆GMR。
We report on the giant magnetoresistance (GMR) of multiwall carbon nanotubes with ultra small diameters. In particular, we consider the effect of the inter-wall interactions and the lead/nanotube coupling. Comparative studies have been performed to show that in the case when all walls are well coupled to the electrodes, the so-called inverse GMR can appear. The tendency towards a negative GMR depends on the inter-wall interaction and on the nanotube le ngth. If, however, the inner nanotubes are out of contact with one of the electrodes, the GMR remains positive even for relatively strong inter-wall interactions regardless of the outer nanotube length. These results shed additional light on recently reported experimental data, where an inverse GMR was found in some multiwall carbon nanotube samples.