Part 2 GMI/GMR Giant Magnetoimpedance/ Magnetoresistance in - - PowerPoint PPT Presentation
Part 2 GMI/GMR Giant Magnetoimpedance/ Magnetoresistance in magnetic nanostructures Z/Z , f=120GHz R/R AFM 2H m 1.0 1.0 M 2H j NM M 0.5 FM 0.5 M NM 0 0 M - 1000 + 1000 +1000 - 1000 Magn. field, Oe Magn. field, Oe Types of
M NM
core
~5
0D-structure 1D-structure 2D-structure
Types of nanostructures for study in dept
Granular structures Microwires Multilayered structures
M M
FM
NM NM M M
AFM
2H
m
2Hj
ΔR/R ΔZ/Z, f=120GHz
1.0 0.5 1.0 0.5 +1000
+1000
List of relevant papers see in appendix please
as a component of Radiospectroscopy complexes for researches at f = 50 MHz – 40 GHz
NA with Open Resonator research unit NA with Giant Magnetoimpedance cell Waveguide-coaxial adopters 10-40GHz
19
waveguide horn magnet poles
2 4 6 32 36 40
simulation experiment
3
2
fedge, GHz H, kOe
1
Ferrite MPC in “quasi”-ambient space Ferrite MPC in waveguide
Metal-dielectric MPC in waveguide EXPERIMENTAL SETUP
30 40 50 60 70 80 0,0 0,5 1,0
0 kOe 5 kOe
T, a.u. f, GHz
Passive probe Active probe
Field distribution in the MagnetoPhotonic Crystals (MPC)
10 20 30 40 50 60 0,0 0,5 1,0 |S21|2, a.u. distance , a.u.
f = 37 GHz
For Stop-band
Distance, a.u.
100 200 300 400 500 600 0,0 0,2 0,4 0,6 0,8 1,0
|S21|
2, a.u.X, a.u f = 32 GHz
Distance, a.u. Field density, a.u.
Pass band Stop band
Field density, a.u. Distance, a.u.
MPC Mirror-reflected MPC quartz ferrite airgap
Stop band edge “Tamm” peak position depends
2,10E+010 2,80E+010 3,50E+010 4,20 0,00 0,09 0,18
Frequency, Hz
frequency transmitting
2,20E+010 2,25E+010 2,30E+010 2,35E+010 0,000 0,002 0,004 0,006 0,008
Frequency, Hz
Q>1000
transmitting frequency
MPC+WM
25 30 35 40 45 50 Transmission, a.u. Frequency, GHz
MPC+TWS TWS MPC
Tamm peak x
j d 21 2 11 j d 22 2 12
( )
B B
k k k
m m e m e m