Spin-dependent magnetoresistance in multiwall carbon nanotubes

Hoffer, X.; Klinke, Christian; Bonard, Jean–Marc; Gravier, L.; Wegrowe, J.-E.

doi:10.1209/epl/i2003-10273-1

Cited by 23 publications

(17 citation statements)

References 35 publications

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“…In recent years, also spin transport through quantum dots formed by nanotubes, molecular systems or nanoparticles has started to attract attention both experimentally 2,3,4,5,6,7,8 and theoretically. 9,10,11,12,13,14,15,16 One of the motivations for this has been the possibility of using quantum dots with a single spin as qubits, but naturally also a number of fundamental questions arise on how the interplay of spin coherence and interactions influences the transport.…”

Section: Introductionmentioning

confidence: 99%

Noncollinear magnetoconductance of a quantum dot

Pedersen

Thomassen²,

Flensberg³

2005

Phys. Rev. B

105

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We study theoretically the linear conductance of a quantum dot connected to ferromagnetic leads. The dot level is split due to a non-collinear magnetic field or intrinsic magnetization. The system is studied in the non-interacting approximation, where an exact solution is given, and, furthermore, with Coulomb correlations in the weak tunneling limit. For the non-interacting case, we find an anti-resonance for a particular direction of the applied field, non-collinear to the parallel magnetization directions of the leads. The anti-resonance is destroyed by the correlations, giving rise to an interaction induced enhancement of the conductance. The angular dependence of the conductance is thus distinctly different for the interacting and non-interacting cases when the magnetizations of the leads are parallel. However, for anti-parallel lead magnetizations the interactions do not alter the angle dependence significantly.

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Section: Introductionmentioning

confidence: 99%

Noncollinear magnetoconductance of a quantum dot

Pedersen

Thomassen²,

Flensberg³

2005

Phys. Rev. B

105

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“…An other characteristic is that the temperature dependence of the conductance is a power law of the form G(T ) = G 0 T −α , where α is around 0.3. But the most striking result is that all data at different V bias and temperatures collapse on a unique curve [190], Figure 17. This is the manifestation of a scaling law; the quantity GT −α is a function of the variable eV/kT.…”

Section: Carbon Nanotubesmentioning

confidence: 99%

“…Alumina membranes are a very widely used template for the growth of carbon nanotubes [109][110][111][112][113][114][115][116][117][118][119][120]147,[186][187][188][189]. Multi-wall carbon nanotubes (MWNT) were grown by a CVD reaction in the porous of alumina for transport measurements, Figure 16 [190]. The alumina membranes were made, as previously described, by anodization of aluminium in 0.3 mol/l oxalic acid at 40 volts for 10 minutes, depending on the desired length.…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Template synthesis of nanomaterials

Wade

Wegrowe

2005

Eur. Phys. J. Appl. Phys.

128

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Abstract. We present an overview of template synthesis as it applies to our nanomaterials research. This bottom-up approach is motivated by our desire to find an alternative to the big, top-down approaches to nanoscience, such as clean-rooms and X-ray lithography. Using universally available templates and materials, and very modest synthesis techniques, we have created a variety of interesting and useful structures. Starting with homogeneous ferromagnetic nanowires, we were able to study and manipulate spin-dependent transport. Next, we branched into multi-layer GMR and spin-valve structures for spintronics. As a side trip, we put carbon-encapsulated fullerene nanoparticles into nanopores for ballistic magnetoresistance studies. Carbon nanotube molecules were grown in templates by CVD self assembly. The carbon nanotubes grown using a cobalt catalyzer show spin-valve, ballistic transport, and Coulomb blockade effects. Very recently, we have started to study templated semiconductor nanorods with the amazing result that their behaviour is very similar to that of the carbon nanotubes and can be reduced to a scaling law. Essentially, the template acts as a skeleton for the nanoscale synthesis and macroscale contact of an infinite variety of materials and structures. It is our hope that by the following examples we demonstrate that high quality nanoscience research is available to everybody. PACS

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“…Spintronics devices exploiting the spin of the electron [1][2][3][4][5][6][7][8][9][10] are prepared to revolutionise the electronics industry. The significance of this new generation device is faster memory and lower power consumption at low electron density.…”

Section: Introductionmentioning

confidence: 99%

“…Yakushiji et al [22] experimentally demonstrated the influence of spin conduction on TMR. The enhancement and oscillation of TMR in ferromagnetic multiple junctions have been predicted by several authors [23][24][25][26][27][28][29][30]. However, there have been only a few experiments on spin-dependent single electron tunnelling (SET) to date [31][32][33][34][35][36] due to the difficulty in fabricating appropriate sample structures for spin-dependent SET.…”

Section: Introductionmentioning

confidence: 99%