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Fabrication and Characterization of Fully Epitaxial Magnetic Tunnel Junction Field Sensors Using a {\rm Co}_{2}{\rm MnSi} Thin Film

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4 Author(s)
Masuda, M. ; Grad. Sch. of Inf. Sci. & Technol., Hokkaido Univ., Sapporo ; Uemura, Tetsuya ; Matsuda, Ken-ichi ; Yamamoto, Masafumi

Fully epitaxial magnetic tunnel junctions (MTJs) consisting of a Co2MnSi (CMS) upper free layer, a MgO tunnel barrier, and a Co50Fe50 lower pinned layer were fabricated for sensor application. The fabricated MTJs exhibited clear exchange-biased tunnel magnetoresistance (TMR) characteristics with a relatively high TMR ratios of 94% at room temperature (209% at 4.2 K) with Vhalf of approximately - 0.52 and + 0.54 V. Almost hysteresis-free TMR characteristics with sensitivity of approximately 0.4%/Oe were obtained with a cross magnetization configuration, in which the magnetization of the CMS free layer was oriented perpendicularly to that of the pinned layer.

Published in:

Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 11 )

Date of Publication:

Nov. 2008

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