title: Low-frequency magnetic noise in micron-scale magnetic tunnel junctions.
abstract: 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.
authors.affiliation: Physics Department, Brown University, Providence, Rhode Island 02912, USA.
authors.forename: S
authors.initials: S
authors.lastname: Ingvarsson
authors.forename: G
authors.initials: G
authors.lastname: Xiao
authors.forename: S S
authors.initials: SS
authors.lastname: Parkin
authors.forename: W J
authors.initials: WJ
authors.lastname: Gallagher
authors.forename: G
authors.initials: G
authors.lastname: Grinstein
authors.forename: R H
authors.initials: RH
authors.lastname: Koch