Abstract Submitted to the    NANOTUBE'04 Conference:

We have proposed a novel ferrite device which will work as a high-frequency filter in THz domain [1]. In this device, the high-frequency current flowing on the carbon nanotubes (CNTs) may excite and receive directly spin waves in the ferrite film beneath them. The wavelength is as small as a few tens nanometers, since the diameter of the CNT matches it to excite the spin waves. One of the main issues of applying CNTs to this device is improving the conductivity. We have analyzed the electronic propagating waves in the CNTs to study the current density distributions around the circumference of the CNTs and the current-voltage characteristics based upon the transfer matrix (TM) method. The conductivity of the CNTs in this device may be improved since the numbers of the multi-modes which contribute to the conductivity can be controlled by the position of the Fermi level in the CNTs. The conductivity may be also improved by excitation schemes of the electronic waves.

References:
[1] T. Umegaki, M. Ogawa, Y. Makino, and T. Miyoshi, " Quantum Transport in Carbon Nanotubes with Arbitrary Chirality," Memoirs Graduate School Science & Technology, Kobe University, 22-A: 103--114, (2004).