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STXM. Cat Graves Stöhr Group SASS Talk 09/30/09. Why use soft X-rays?. Fast and small Elemental specificity Magnetic contrast Penetration depth. Bunch width ~70 ps. Bunch spacing 2 ns. larger “Camshaft” pulse. Gap. Why use soft X-rays?. Fast and small Elemental specificity

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STXM

Cat Graves

Stöhr Group

SASS Talk

09/30/09


Why use soft x rays
Why use soft X-rays?

  • Fast and small

  • Elemental specificity

  • Magnetic contrast

  • Penetration depth


Why use soft x rays1

Bunch width ~70 ps

Bunch spacing 2 ns

larger “Camshaft” pulse

Gap

Why use soft X-rays?

  • Fast and small

  • Elemental specificity

  • Magnetic contrast

  • Penetration depth

ALS: Electron Bunches in Storage Ring


Why use soft x rays2
Why use soft X-rays?

  • Fast and small

  • Elemental specificity

  • Magnetic contrast

  • Penetration depth

Figure adapted from Stöhr and Siegmann, Magnetism (2006)


Why use soft x rays3
Why use soft X-rays?

  • Fast and small

  • Elemental specificity

  • Magnetic contrast

  • Penetration depth


Why use soft x rays4
Why use soft X-rays?

  • Fast and small

  • Elemental specificity

  • Magnetic contrast

  • Penetration depth


What is a stxm
What is a STXM?

Scanning Transmission X-ray Microscopy

  • How is it different from an optical microscope?

EPU

  • Zone plate - OSA

  • Energy tunability - Polarization control (EPU)

  • Raster scan - Synchrotron radiation


What is a stxm1
What is a STXM?

Scanning Transmission X-ray Microscopy

  • Zone plates

    • Fresnel diffraction

    • E-beam litho

    • Spatial Resolution Limit


What is a stxm2
What is a STXM?

Scanning Transmission X-ray Microscopy

  • Order Sorting Aperture (OSA)

    • Requires careful alignment with Zone plate


What is it good for
What is it good for?

  • Example 1: Environmental applications

Advanced Light Source Molecular Environmental Science (ALS-MES) Beamline 11.0.2.


What is it good for1
What is it good for?

  • Example 2 : Ultrafast spin dynamics

Electron flow

Ferromagnet 1

“Fixed Layer”

Ferromagnet 2

“Free Layer”


What is it good for2
What is it good for?

  • Example 2 : Ultrafast spin dynamics

Pump

X-rays

Probe

Free Layer

Spacer Layer

Fixed Layer

Detector

Co/Cu/Co pillar


+I

Pulse Sequence

-I

X-component

100nm

Y-component

Vector field of magnetization


Where are they now
Where are they now?

  • Current locations of STXM

    • ALS, Berkeley

    • Stony Brook, Brookhaven

    • King’s College, Daresbury UK

    • Swiss Light Source

    • Bessy II, Berlin

    • PLS, Korea

    • Canadian Light Source


To the future stxm at ssrl
To the future: STXM at SSRL

  • Under construction at BL 13-3

    • Condensed Matter

    • Surface and thin film