Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 15, Pages 3289-3292Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.3289
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We have observed low-frequency noise due to quasiequilibrium thermal magnetization fluctuations in micron-scale magnetic tunnel junctions (MTJs). This strongly field-dependent magnetic noise occurs within the magnetic hysteresis loops, either as 1/f or Lorentzian (random telegraph) noise. We attribute it to the thermally excited hopping of magnetic domain walls between pinning sites. Our results show that magnetic stability is a crucial factor in reducing the low-frequency noise in small MTJs.
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