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

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