Surface magneto-plasmons in magnetic multilayers - Walther ...

Section 2.5
Magnetic field dependence of surface plasmons 27
p
R
1 .0
0 .8
0 .6
0 .4
0 .2
0 .0
1 .0
0 .8
0 .6
0 .4
0 .2
ε
0 .0
2 0 4 0 6 0 8 0
θ
ε
ε
2 0 4 0 6 0 8 0
Figure 2.13: R p for multilayers consisting of a noble and a magnetic metal. Panel (a)
corresponds to 50 nm Ni, (b) to a double layer of Au40 nmNi10 nm, (c) to a
trilayer of Au20 nmCo5 nmAu5 nm, and (d) to a trilayer Au12 nmCo8 nmAu12 nm.
metal/noble metal (Fig. 2.13(c) and (d)). This is to be expected because the surface
plasmons are excited at the metal air interface and therefore the resonance at a noble
metal-air interface is much sharper than for a magnetic metal-air interface. But, in
such a trilayer surface plasmons are also excited at the noble metal/magnetic metal
interfaces [9, 3] and thus they will be sensitive to the magnetisation of the magnetic
material.
2.5 Magnetic field dependence of surface plasmons
Before discussing the interaction of surface plasmons with an external applied mag-
netic field, the interaction with light and a magnetic field is regarded.
1 .0
0 .8
0 .6
0 .4
0 .2
0 .0
1 .0
0 .8
0 .6
0 .4
0 .2
0 .0