Title :
Fabrication and Characterization of Microstructured Magnetic Tunnel Junction Rings
Author :
Chen, C.C. ; Chang, C.C. ; Kuo, C.Y. ; Horng, Lance ; Wu, J.C. ; Wu, Teho ; Chern, G. ; Huang, C.Y. ; Tsunoda, M. ; Takahash, M.
Author_Institution :
Dept. of Phys., Nat. Changhua Univ. of Educ.
Abstract :
Microstructured magnetic tunnel junction rings have been fabricated by a top-down technique combining electron beam lithography and ion milling process. Four-terminal magnetoresistance measurements and magnetic force microscopy were used to successfully explore a four-transition process within the free layer throughout the magnetization reversal. Various magnetization configurations were identified to be the onion state, vortex-pair state, vortex state, vortex-core state, and reverse onion state. In addition, the various durations of each magnetic state observed in the magnetoresistance curve can be utilized for the study of a coupling effect between the pinned layer and the free layer
Keywords :
electron beam lithography; magnetic force microscopy; magnetic tunnelling; magnetoresistance; milling; coupling effect; electron beam lithography; free layer; ion milling; magnetic force microscopy; magnetization reversal; magnetoresistance curve; magnetoresistance measurements; microstructured magnetic tunnel junction rings; pinned layer; reverse onion state; vortex state; vortex-core state; vortex-pair state; Electron beams; Fabrication; Force measurement; Lithography; Magnetic force microscopy; Magnetic forces; Magnetic tunneling; Magnetization reversal; Magnetoresistance; Milling; Fabrication; magnetic force microscopy (MFM); magnetization reversal; magnetoresistance;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.878868
