Anomalous negative magnetoresistance of multi-walled carbon nanotube with Ni78Fe22 electrodes

Kim, Jinhee; Kim, Jae-Ryoung; Park, Jong-Wan; Kim, Ju‐Jin; Kang, Kicheon; Kim, Nam; Woo, Byung-Chill

doi:10.1016/s1386-9477(02)00968-2

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…The results depend very strongly on ferromagneticelectrode/CNT interfaces, yielding the net GMR effect of the order of 10 -40%. It should be stressed however that also inverse GMR has been reported of roughly similar magnitude but with negative sign [15,17]. A very surprising data concerning Fe-contacted SWCNT were reported in [16], where a measured GMR effect approached 100%, i.e.…”

Section: Gmr In Carbon Nanotubesmentioning

confidence: 81%

“…Bearing in mind, that nowadays CNT lengths used in electric current measurements, are quite often as short as 200-250 nm, it means that practically electrons travel through nanotubes in a spin-coherent way (no spin flips). Experimental papers concern mostly MWCNTs electrically contacted by cobalt [14,15], but there are also reports on iron [16] and permalloy [17] contacted multi-walled and single wall carbon tubes. The results depend very strongly on ferromagneticelectrode/CNT interfaces, yielding the net GMR effect of the order of 10 -40%.…”

Section: Gmr In Carbon Nanotubesmentioning

confidence: 99%

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Spin‐polarized transport through carbon nanotubes

Krompiewski

2005

Physica Status Solidi (b)

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Published online zzz PACS 85.35. Kt, 81.07.De, Carbon nanotubes (CNT) belong to the most promising new materials which can in the near future revolutionize the conventional electronics. When sandwiched between ferromagnetic electrodes, the CNT behaves like a spacer in conventional spin-valves, leading quite often to a considerable giant magneto-resistance effect (GMR). This paper is devoted to reviewing some topics related to electron correlations in CNT. The main attention however is directed to the following effects essential for electron transport through nanotubes: (i) nanotube/electrode coupling and (ii) inter-tube interactions. It is shown that these effects may account for some recent experimental reports on GMR, including those on negative (inverse) GMR.Copyright line will be provided by the publisher 1 Introduction A particularly challenging class of materials for the future electronics are carbon nanotubes, i.e. graphite sheets rolled up in such a manner that they form very long and thin (in atomic scale) cylinders. Their length can be of the order of several micrometers whereas typical cross-sections of single wall carbon nanotubes (SWCNT) are a few nanometers in diameter, and roughly up to 10 times more for multi-wall carbon nanotubes (MWCNT) . Both the SWCNTs and MWCNTs have been attracting much attention of many researchers since they were discovered [1].It is now clear that the electronics based on conventional semiconducting devices (e.g. silicon technology) has faced fundamental limitations as far as further miniaturization is concerned. The reasons are various, including the fact that the relative amount of surface states -destructive for electronic transport properties -increases rapidly in 2-and 3-dimensional systems when their sizes are being reduced. Likewise, it is predicted that the SiO 2 layer in the MOSFET will be too thin soon (within 10 years or so) to retain its insulating properties [2]. So, there is much interest of physicists, technologists and engineers in new generation nano-scale devices, including molecular ones. The adopted approach is the so-called bottom up philosophy, aiming at designing electronic devices at the molecular level. In contrast to siliconbased devices, the molecular ones (incl. carbon nanotubes, CNT) can successfully cope with the more and more demanding miniaturization requirements without worsening their multi-functional properties. Most probably the CNTs are also good candidates for spintronics applications in view of their unusually long spin diffusion length. It is well-known that electrons can travel through carbon nanotubes up to many hundreds of nanometers, still keeping their momentum and spin orientation. So CNTs are believed to be useful in the near future microelectronics (or molecular electronics) as interconnects, and possibly also as active elements in integrated circuits. Physical properties of the CNTs connected to metallic electrodes depend critically on a quality of CNT/metal junctions, and may evolve with increasing transparencies of the j...

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Section: Gmr In Carbon Nanotubesmentioning

confidence: 81%

Section: Gmr In Carbon Nanotubesmentioning

confidence: 99%

Spin‐polarized transport through carbon nanotubes

Krompiewski

2005

Physica Status Solidi (b)

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“…This observation may be interpreted in terms of a reminiscence of the Luttinger-liquid behaviour with spin-charge separation.Carbon multiwall nanotubes (MWNT) and single-wall nanotubes (SWNT) are considered as the most promising building blocks for both nanoelectronics and molecular electronics. There are a wide variety of possible applications for carbon nanotubes, including spintronics [1], which has led to studies into spin-dependent transport in carbon nanotubes [2][3][4][5]. Aside from the possible industrial applications of spintronics, the study of such magnetic systems allows the investigation of fundamental questions, into the role of the spin degrees of freedom in quantum wires or Luttinger liquids (LL) [6,7].…”

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confidence: 99%

Spin-dependent magnetoresistance in multiwall carbon nanotubes

Hoffer¹,

Klinke²,

Bonard³

et al. 2004

Europhys. Lett.

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The spin-dependent transport in multiwall carbon nanotubes obtained by chemical vapor deposition (CVD) in porous alumina membranes is studied. The zero bias anomaly is found to verify the predicted Luttinger liquid power law. The magnetoresistance at high fields varies in sign and amplitude from one sample to the other, which is probably due to the presence of dopant in the tube. In contrast, the magnetoresistance due to the spin polarized current is destroyed in the nanotube as expected in case of spin-charge separation. PACS numbers: 73.63.Fg (Electronic transport in nanotubes), 72.15.Nj (Collective modes), 72.25.Hg (Electrical injection of spin polarized carriers)

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