TY - JOUR
T1 - Magnetic and Free-layer Properties of MgO/(Co)FeB/MgO Structures
T2 - Dependence on CoFeB Composition
AU - Bersweiler, Mathias
AU - Sato, Hideo
AU - Ohno, Hideo
N1 - Funding Information:
The authors would like to thank T. Hirata, H. Iwanuma, Y. Kawato, and K. Goto for technical support and J. Llandro and S. Fukami for the fruitful discussions. This work was supported by the ImPACT Program of CSTI and JST-OPERA.
Publisher Copyright:
© 2010-2012 IEEE.
PY - 2017/9/1
Y1 - 2017/9/1
N2 - We investigate the magnetic properties of MgO/(Co1- xFex)75B25/MgO trilayers with Fe composition x varied from 0.5 to 1.0 and properties of magnetic tunnel junction (MTJ) with this structure as a free layer. The interfacial and bulk anisotropy energy densities increase, and the damping constant α decreases, with increasing x. For MTJs made with this structure as the free layer, the coercive field and thermal stability factor δ both increase with increasing x. Higher switching efficiency, defined as the ratio of δ to intrinsic critical current, is expected for devices with higher Fe composition owing to the smaller α.
AB - We investigate the magnetic properties of MgO/(Co1- xFex)75B25/MgO trilayers with Fe composition x varied from 0.5 to 1.0 and properties of magnetic tunnel junction (MTJ) with this structure as a free layer. The interfacial and bulk anisotropy energy densities increase, and the damping constant α decreases, with increasing x. For MTJs made with this structure as the free layer, the coercive field and thermal stability factor δ both increase with increasing x. Higher switching efficiency, defined as the ratio of δ to intrinsic critical current, is expected for devices with higher Fe composition owing to the smaller α.
KW - magnetic anisotropy
KW - magnetic tunnel junction
KW - Spin electronics
KW - thermal stability factor
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U2 - 10.1109/lMAG.2017.2748929
DO - 10.1109/lMAG.2017.2748929
M3 - Article
AN - SCOPUS:85029177340
SN - 1949-307X
VL - 8
JO - IEEE Magnetics Letters
JF - IEEE Magnetics Letters
M1 - 8025339
ER -