TY - JOUR

T1 - Dynamical response of nanoscale magnet in the environment with noise

AU - Nishino, Masamichi

AU - Saito, Keiji

AU - Miyashita, Seiji

N1 - Funding Information:
The present work was supported by Grant-in-Aid for Scientific Research from Ministry of Education, Culture, Sports, Science and Technology of Japan. M.N. is also supported by the Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists.

PY - 2002/6

Y1 - 2002/6

N2 - We have investigated the effect of noise on the energy gap of the quantum resonant tunneling. By the use of the Landau-Zener-Stückelberg formula, we estimate the tunneling gap of the two level system with S = 1/2 and also that of the lowest two levels in the realistic model with S = 10. As observed in the corresponding experiments, the estimated gap has no velocity dependence in fast sweeping field in both systems. We show that a correction for the estimated energy gap is necessary for the two level system with S = 1/2, while the effect of noise is negligible for the system with S = 10. We discuss the difference between both systems and also interpretation of the experimental data.

AB - We have investigated the effect of noise on the energy gap of the quantum resonant tunneling. By the use of the Landau-Zener-Stückelberg formula, we estimate the tunneling gap of the two level system with S = 1/2 and also that of the lowest two levels in the realistic model with S = 10. As observed in the corresponding experiments, the estimated gap has no velocity dependence in fast sweeping field in both systems. We show that a correction for the estimated energy gap is necessary for the two level system with S = 1/2, while the effect of noise is negligible for the system with S = 10. We discuss the difference between both systems and also interpretation of the experimental data.

KW - A. Magnetic materials

KW - D. Magnetic properties

KW - D. Magnetic structure

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U2 - 10.1016/S0022-3697(02)00088-4

DO - 10.1016/S0022-3697(02)00088-4

M3 - Conference article

AN - SCOPUS:0036602586

VL - 63

SP - 1523

EP - 1526

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

SN - 0022-3697

IS - 6-8

T2 - Proceedings of the 8th ISSP International Symposium

Y2 - 2 November 2001 through 5 November 2001

ER -