TY - JOUR
T1 - Reduction in switching current using a low-saturation magnetization Co-Fe-(Cr, V)-B free layer in MgO-based magnetic tunnel junctions
AU - Kubota, Hitoshi
AU - Fukushima, Akio
AU - Yakushiji, Kay
AU - Yakata, Satoshi
AU - Yuasa, Shinji
AU - Ando, Koji
AU - Ogane, Mikihiko
AU - Ando, Yasuo
AU - Miyazaki, Terunobu
N1 - Funding Information:
This work was partially supported by the New Energy and Industrial Technology Development Organization (NEDO).
PY - 2009
Y1 - 2009
N2 - Magnetic properties, magnetoresistance (MR), and spin-transfer switching of magnetic tunnel junctions having a structure of Co60 Fe20 B20 3 nm/MgO 1 nm/ (Co75 Fe25) 80-X Cr (V) X B20 2 nm (X=0-25) were investigated. Magnetization of the (Co-Fe)-(Cr, V)-B free layer decreased from 1.2 T before substitution to 0.6 T at Cr of 10% (0.8 T at V of 10%). The MR ratio and a resistance-area product (RA) before substitution were, respectively, about 130% and about 2 μ m2. The MR ratio decreased to 80% at Cr of 10% and 40% at V of 10%. The RA values were almost independent of the composition. The intrinsic switching current density (Jc0) decreased from 15 to 8 MA/ cm2 at Cr of 10% and 12 MA/ cm2 for V of 10%. Upon the further increase in Cr and V, stable switching was difficult to observe. In summary, Jc0 decreased to half in the case of Cr, but the effect was small for V.
AB - Magnetic properties, magnetoresistance (MR), and spin-transfer switching of magnetic tunnel junctions having a structure of Co60 Fe20 B20 3 nm/MgO 1 nm/ (Co75 Fe25) 80-X Cr (V) X B20 2 nm (X=0-25) were investigated. Magnetization of the (Co-Fe)-(Cr, V)-B free layer decreased from 1.2 T before substitution to 0.6 T at Cr of 10% (0.8 T at V of 10%). The MR ratio and a resistance-area product (RA) before substitution were, respectively, about 130% and about 2 μ m2. The MR ratio decreased to 80% at Cr of 10% and 40% at V of 10%. The RA values were almost independent of the composition. The intrinsic switching current density (Jc0) decreased from 15 to 8 MA/ cm2 at Cr of 10% and 12 MA/ cm2 for V of 10%. Upon the further increase in Cr and V, stable switching was difficult to observe. In summary, Jc0 decreased to half in the case of Cr, but the effect was small for V.
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U2 - 10.1063/1.3068484
DO - 10.1063/1.3068484
M3 - Article
AN - SCOPUS:65249156676
SN - 0021-8979
VL - 105
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 7
M1 - 07D117
ER -