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Double magnetic tunnel junctions with cross-magnetization configurations for electrical detection of domain-wall structures

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4 Author(s)
Uemura, Tetsuya ; Division of Electronics for Informatics, Hokkaido University, Sapporo 060-0814, Japan ; Sawada, K. ; Matsuda, Ken-ichi ; Yamamoto, Masafumi

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A device consisting of double magnetic tunnel junctions with cross-magnetization configurations is proposed to enable simultaneous electrical detection of both the structure and motion of a domain-wall (DW). Operation of this device has been confirmed through micromagnetic simulation. Owing to the cross-magnetization configurations, two types of DW structure formed in a ferromagnetic wire were clearly identified: a transverse wall (TW) in which the magnetization at the center of the wall is directed transversely to the wire axis and a vortex wall (VW) in which the magnetization circulates in the plane around a small perpendicular vortex core. In addition to the structural difference between TW and VW, the velocity of the DW motion was detected through the time response of the tunneling magnetoresistance.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 1 )

Date of Publication:

Jul 2009

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