SLIDE 1
Magnetic Domains and Domain Walls Bitter-Technique (ferromagnetic - - PowerPoint PPT Presentation
Magnetic Domains and Domain Walls Bitter-Technique (ferromagnetic - - PowerPoint PPT Presentation
Magnetic Domains and Domain Walls Bitter-Technique (ferromagnetic colloids on surfaces) Stress induced domains in NiFe single crystal Magneto-optics Magneto-optical Kerr Effect Magneto-optical Kerr Effect Kerr microscopes Domains in Fe
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Magneto-optics Magneto-optical Kerr Effect
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Magneto-optical Kerr Effect
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Kerr microscopes
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Domains in Fe single crystal
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Transmission electron microscopy Lorentz microscopy
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Scanning electron microscopy with polarization analysis (SEMPA) Co single crystal (0001) SiFe single crystal
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Magnetic Force Microscopy Image: Border of a 30 µm wide bit track of 300 kfrpi (89 nm bit length)
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Electrons
Photo electron emission microscopy
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Excited oscillation modes
H
h I
1 2
H
h h I
1 2
I
1 2
AXMCD ~ M. ~ cos
16x32 µm2 10 nm Py/Cu
PhD-thesis of A. Krasyuk
Oscillating field , 1GHz, 0.2mT
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E ρ E ρ Tip Sample e- E ρ E ρ Tip Sample
antiparallel
SP-STM and magnetic contrast
parallel ) M , M ( cos ) eU ( m m ) eU ( n n ) eU ( n ) ( n ) eU ( n ) ( n ) U ( dU dI
S T S T S T S T S T
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W(110) Au(111)
Co
W(110) Au(111)
Co
- T. Duden and E. Bauer,
- M. R. S. Proc.,287 (1997).
W(110) Au Co
W tips -
flashing 2000 K evaporation - RT
10 ML Au 4 – 16 ML Co
[110]
Tip and sample preparation
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Out-of-plane magnetic contrast
100 nm
Fe Fe Mo Fe Fe Mo
100 nm
dI dU
__
dI dU
__ 4 ML Co/Au/W
[110] _ [001]
100 nm T = 5 K I = 1.5 nA U = 0.3V T = 5 K I = 1.5 nA U = 0.4V
(500 500) nm2 (500 500) nm2
Mo(110) Fe
height [Å] lateral displacement [nm]
Fe Mo(110)
height [Å] lateral displacement [nm]
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40nm
2 4 6 8 10 12 14
- 50
50 100 150
X[nm] Z[mV]
1.2±0.2 nm
14nm
40nm
Domain wall width in the ML Fe nanowires
dI dU
__
dI dU
__ 4 ML Co/Au/W Fe Fe
Mo
T = 5 K I = 1.5 nA U = 1 V
(200 200) nm2 (70 70) nm2
Topography
] 001 [ ] 1 1 [
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Domain wall Width: wML = 6 Å Energy: eML=15.2 meV/atom row
Domain wall width in Fe on W(110)
Exchange stiffness A = 3.6 pJ/m (8.2 meV/atom) Anisotropy constant K = 41 MJ/m3 (4.0 meV/atom)
- M. Pratzer, H.J. Elmers, M. Bode, O. Pietzsch,
- A. Kubetzka, and R. Wiesendanger, Phys. Rev.
- Lett. 87, 127201 (2001).
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- A. Hubert and R. Schäfer