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URN etd-0908111-121202
Author Chih Hsiang
Author's Email Address r1bigtongue@hotmail.com
Statistics This thesis had been viewed 5356 times. Download 780 times.
Department Physics
Year 2010
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Current-induced phenomenon on Fe/W(111) and the improvement of
signal to noise ratio
Date of Defense 2011-07-27
Page Count 55
Keyword
  • Anisotropy
  • Mode-Hopping
  • Fe/W(111)
  • MOKE
  • Bias
  • Abstract In our earlier research, we found the MOKE signal incident from 45 degree would
    cause perpendicular signal to couple with the longitudinal one. To distinguish
    the signal from one to another, we arranged 45 degree and 0 degree optical setup
    for the measurement of longitudinal and perpendicular respectively. However,
    hysteresis loops are only observed in the longitudinal direction.
    To measure smaller signal in our experiment, we reduced the noise level by
    one order and thus improved the signal to noise ratio. It’s ten times better then
    previous result. Under smaller signal or worse S/N ratio condition, we still
    measured the MOKE signal.
    In order to quantitatively analyze the current-induced field, we made a metal
    coil and try to measure the bias produced by the field. And we injected the
    reverse current-induced field, , try to counteract the bias of hysteresis loop which
    is induced by sample current.
    Besides, we also dosed oxygen on the sample and measured the MOKE signal.
    There was no change comparing with which is measured in gas-free condition.
    But we found the coercivity became larger after annealing to 300K, and the
    current-induced bias in oxygen become smaller.
    Advisory Committee
  • Ker Jar Song - chair
  • Wen Chin Lin - co-chair
  • Chien Cheng Kuo - advisor
  • Files
  • etd-0908111-121202.pdf
  • indicate access worldwide
    Date of Submission 2011-09-08

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