Kondo effect in magnetic tunnel junctions.
Tunneling magnetoresistance was found to be suppressed with decreasing temperature for magnetic tunnel junctions (MTJs) oxidized under high plasma power. A strong temperature dependence of the junction resistance was observed, along with zero-bias anomalies of dynamic resistance at low temperatures. Resistance shows a logarithmic dependence on temperature, and resistance versus temperature exhibits a scaling behavior. Our experimental data can be explained in a consistent way by the Kondo effect in the MTJs with the Kondo temperature TK=20-30 K.
Lee
K I
KI
Nano Device Research Center, Korea Institute of Science and Technology, Seoul 136-792, Korea.
Joo
S J
SJ
Lee
J H
JH
Rhie
K
K
Kim
Tae-Suk
TS
Lee
W Y
WY
Shin
K H
KH
Lee
B C
BC
LeClair
P
P
Lee
J-S
JS
Park
J-H
JH