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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/40309

Title: Magnetic noise in MgO-based magnetic tunnel junction rings
Author: COEY, JOHN MICHAEL DAVID
FENG, JIA-FENG
Sponsor: Science Foundation Ireland
Author's Homepage: http://people.tcd.ie/jcoey
http://people.tcd.ie/jfeng
Keywords: Atomic, molecular and chemical physics
Magnetization switching
Issue Date: 2010
Publisher: American Institute of Physics
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. 052504
Series/Report no.: Applied Physics Letters;
96;
5;
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.
Description: PUBLISHED
URI: http://hdl.handle.net/2262/40309
Appears in Collections:Physics (Scholarly Publications)

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