Low-frequency magnetic noise in micron-scale magnetic tunnel junctions

Authors
Ingvarsson, S Xiao, G Parkin, SSP Gallagher, WJ Grinstein, G Koch, RH
Citation
S. Ingvarsson et al., Low-frequency magnetic noise in micron-scale magnetic tunnel junctions, PHYS REV L, 85(15), 2000, pp. 3289-3292
Citations number
14
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
85
Issue
15
Year of publication
2000
Pages
3289 - 3292
Database
ISI
SICI code
0031-9007(20001009)85:15<3289:LMNIMM>2.0.ZU;2-M
Abstract
We have observed low-frequency noise due to quasiequilibrium thermal magnet ization fluctuations in micron-scale magnetic tunnel junctions (MTJs). This strongly field-dependent magnetic noise occurs within the magnetic hystere sis loops, either as 1/f or Lorentzian (random telegraph) noise. We attribu te it to the thermally excited hopping of magnetic domain walls between pin ning sites. Our results show that magnetic stability is a crucial factor in reducing the low-frequency noise in small MTJs.