TY - JOUR
T1 - High spin-torque diode sensitivity in CoFeB/MgO/CoFeB magnetic tunnel junctions under DC bias currents
AU - Ishibashi, Shota
AU - Ando, Ken
AU - Seki, Takeshi
AU - Nozaki, Takayuki
AU - Kubota, Hitoshi
AU - Yakata, Satoshi
AU - Maehara, Hiroki
AU - Fukushima, Akio
AU - Yuasa, Shinji
AU - Suzuki, Yoshishige
N1 - Funding Information:
This work was supported in part by the Strategic Information and Communications R&D Promotion Programme from the Ministry of Internal Affairs and Communications, and in part by the Ministry of Education, Culture, Sports, Science and Technology under Grant A19206002.
PY - 2011/10
Y1 - 2011/10
N2 - We report a large enhancement of spin-torque diode sensitivity in CoFeB/MgO/CoFeB magnetic tunnel junctions measured under perpendicular magnetic fields and dc bias currents. In the measurement of homodyne detection, a large dc output voltage of 190 μ V was obtained when an RF signal power of -30 dB·m and a dc current of +1.0 mA were applied. This value corresponds to the diode sensitivity of 190 mV/mW (260 mV/mW after impedance matching correction). The main origin of this enhancement is an offset of the damping torque and an increase in the precession angle induced by the spin-transfer torque due to the dc bias current application.
AB - We report a large enhancement of spin-torque diode sensitivity in CoFeB/MgO/CoFeB magnetic tunnel junctions measured under perpendicular magnetic fields and dc bias currents. In the measurement of homodyne detection, a large dc output voltage of 190 μ V was obtained when an RF signal power of -30 dB·m and a dc current of +1.0 mA were applied. This value corresponds to the diode sensitivity of 190 mV/mW (260 mV/mW after impedance matching correction). The main origin of this enhancement is an offset of the damping torque and an increase in the precession angle induced by the spin-transfer torque due to the dc bias current application.
KW - Magnetoresistance effect
KW - MgO-based magnetic tunnel junctions (MTJs)
KW - spin-torque diode effect
KW - spin-torque diode sensitivity
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U2 - 10.1109/TMAG.2011.2159830
DO - 10.1109/TMAG.2011.2159830
M3 - Article
AN - SCOPUS:80053483923
SN - 0018-9464
VL - 47
SP - 3373
EP - 3376
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 10
M1 - 6028146
ER -