Magnetic noise in MgO-based magnetic tunnel junction rings
Citation:
Feng, J.F., Diao, Z., Feng, G., Nowak, E.R., Coey, J.M.D. , Magnetic noise in MgO-based magnetic tunnel junction rings , Applied Physics Letters, 96, 5, 2010, art. no. 052504Download Item:
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Abstract:
Magnetization switching is investigated in ring-shaped MgO-based magnetic tunnel junctions with
168% tunneling magnetoresistance. Besides the forward and reverse onion states, two vortex
states and several metastable states are observed for the ferromagnetic free layer. Electrical noise
is used to characterize the low frequency magnetization dynamics; a stationary 1/ f noise spectrum
is observed within each magnetic state but they are separated by noise peaks which show a
1/ f2 spectrum that is associated with slow random telegraph fluctuations. In the 1/ f region,
the normalized magnetic noise parameter, mag, is shown to be consistent with the
fluctuation-dissipation theorem.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
Author's Homepage:
http://people.tcd.ie/jcoeyDescription:
PUBLISHEDType of material:
Journal ArticleCollections:
Series/Report no:
Applied Physics Letters96
5
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Nanoscience & MaterialsDOI:
http://dx.doi.org/10.1063/1.3295707Licences: