Matias URDAMPILLETA - TEL

tel-00770488, version 1 - 7 Jan 2013
µ 0 H switching (T)
1.0
0.8
0.6
0.4
0.2
0.0
E 0 ≈ 15 K
1/τ 0 ≈ 5.10 -8 s -1
2
4
6
T ln( 2.10 6 kT/v ) (K)
8
10
12
100 mK
300 mK
500 mK
600 mK
700 mK
800 mK
900 mK
T ln(2.10 6 kT/v) −1
1 − 100 −1
kBT H0
ln
=
τ0E0v
E0
H0kBT (H0 − Hsw)
v = dH/dt sw
Hsw = H0 1 − kBT
kBT H0
ln
τ0E0v
E0
E0 τ0
0.1 0.9
τ0E0
Hsw T ln
kBT H0v
0.5
τ −1
0 = 5.108 −1 E0 = 15
τ −1
0 CE 3 0
C = 200
E0
14