Abrupt Magnetoresistance Jumps in Ni-Wire Systems and Coulomb Blockade Under Elastic Environment in Single Junction/Carbon Nanotube System

J. Haruyama, I. Takesue, S. Kato, K. Takazawa and Y. Sato
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J. Haruyama: Aoyama Gkuin University, Dept. Electrical Engineering and Electronics
I. Takesue: Aoyama Gkuin University, Dept. Electrical Engineering and Electronics
S. Kato: Aoyama Gkuin University, Dept. Electrical Engineering and Electronics
K. Takazawa: Aoyama Gkuin University, Dept. Electrical Engineering and Electronics
Y. Sato: Aoyama Gkuin University, Dept. Electrical Engineering and Electronics

A chapter in Macroscopic Quantum Coherence and Quantum Computing, 2001, pp 427-442 from Springer

Abstract: Abstract We report on: 1. An abrupt magnetoresistance (MR) jump in a Ni-nanowire system and on; 2. Coulomb blockade (CB) associated with localization effect in its external environment in a multi-walled Carbon Nanotube (MWNT)/single tunnel junction system. The observed MR hysteresis, wire diameter, and temperature dependences indicate a possibility that the MR jump originates from macroscopic quantum tunneling of a magnetic domain wall in the Ni-wire. Its correlation with phase coherence of electron waves, weak localization, is also discussed. Since one can pick up MQT as a large MR jump with keeping phase coherence in the system, it may be attractive for magnetic quantum computation. CB in single tunnel junctions is also observable even under nondissipative high impedance external environment, localization, in MWNT system. Since discussion about it is associated with the spirit of Caldeira and Leggett, it may be meaningful for MQC. The CB is also very sensitive to phase modulation in its external environment.

Keywords: Ferromagnetic nanowire; magenetoresistance jump; macroscopic quantum tunneling; localization; Coulomb blockage; singe junction; external environment; energy transfer; Carbon nanotube (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/978-1-4615-1245-5_43

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