142
S. Krishnia and W. S. Lew
Fig. 36 a First and b second harmonics of the Hall voltage for net ‘up’ (red) and ‘down’
(black) magnetizations versus longitudinal field, measured for a current density 1.04 × 10 11 A/m 2 .
c First and d second harmonics of the Hall voltage for net ‘up’ (red) and ‘down’ (black)
magnetizations versus transverse field, measured for a current density 1.04 × 10 11 A/m 2 .
e SL fields for ‘up’ (red) and ‘down’ (black) net magnetizations with current densities.
f FL fields for ‘up’ (red) and ‘down’ (black) net magnetizations with different current densities. All the measurements were performed on the device fabricated on thin film stack
Ta(3)/Pt(3)/[Co(0.4)/Ni(0.7)/Co(0.4)]/Ru(0.8)/[Co(0.4)/Ni(0.7)/Co(0.4)]/Ta(3)
H SL(F L) =
C
B
= −2
∂ V 2ω
∂ H L(T )
∂
2 V ω
∂ H
2
L(T )
.
(32)
The longitudinal effective field increases linearly with applied current density for
both ‘up’ (red) and down (black) net magnetizations as shown in the Fig. 36. Also, it