SASS Talk 093009 Why use soft Xrays Fast and small Elemental specificity Magnetic contrast Penetration depth Why use soft Xrays Fast and small Elemental specificity Magnetic contrast ID: 935318
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Slide1
STXM
Cat Graves
Stöhr
GroupSASS Talk09/30/09
Slide2Why use soft X-rays?
Fast and smallElemental specificityMagnetic contrastPenetration depth
Slide3Why use soft X-rays?
Fast and smallElemental specificityMagnetic contrastPenetration depth
Bunch spacing 2 ns
Bunch width ~70 ps
larger “Camshaft” pulse
Gap
ALS: Electron
Bunches in Storage Ring
Slide4Why use soft X-rays?
Fast and small
Elemental specificityMagnetic contrastPenetration depth
Figure adapted from
St
ö
hr
and
Siegmann
,
Magnetism
(2006)
Slide5Why use soft X-rays?
Fast and smallElemental specificityMagnetic contrastPenetration depth
Slide6Why use soft X-rays?
Fast and smallElemental specificityMagnetic contrastPenetration depth
Slide7What is a STXM?
How is it different from an optical microscope?Scanning Transmission
X-ray Microscopy
Zone plate - OSA
Energy
tunability
- Polarization control (EPU)
Raster scan - Synchrotron radiation
EPU
Slide8Zone platesFresnel diffraction
E-beam lithoSpatial Resolution LimitWhat is a STXM?
Scanning Transmission
X-ray Microscopy
Slide9Order Sorting Aperture (OSA)Requires careful alignment with Zone plate
What is a STXM?S
canning Transmission X-ray M
icroscopy
Slide10What is it good for?
Example 1: Environmental applications
Advanced Light Source Molecular Environmental Science (ALS-MES)
Beamline 11.0.2.
Slide11What is it good for?
Example 2 : Ultrafast spin dynamics
Ferromagnet 1
“Fixed Layer”Ferromagnet 2
“Free Layer”
Electron flow
Slide12What is it good for?
Example 2 : Ultrafast spin dynamics
Free Layer
Fixed Layer
Spacer Layer
Detector
X-rays
Pump
Probe
Co/Cu/Co pillar
Slide13Pulse Sequence
X-component
Y-component
Vector field of magnetization
100nm
+I
-I
Slide14Where are they now?
Current locations of STXMALS, BerkeleyStony Brook, BrookhavenKing’s College, Daresbury UKSwiss Light SourceBessy
II, BerlinPLS, KoreaCanadian Light Source
Slide15To the future: STXM at SSRL
Under construction at BL 13-3Condensed MatterSurface and thin film
Slide16