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X-PEEM and its applications

X-PEEM and its applications. EE 235 Presentation 2 Brian Lambson. Key Terms. Photoelectron Emission Microscopy (PEEM). Key Terms. Photoelectron Emission Microscopy (PEEM) X-ray Magnetic Circular Dichroism (XMCD). Key Terms. Photoelectron Emission Microscopy (PEEM)

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X-PEEM and its applications

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  1. X-PEEM and its applications EE 235 Presentation 2 Brian Lambson

  2. Key Terms • Photoelectron Emission Microscopy (PEEM)

  3. Key Terms • Photoelectron Emission Microscopy (PEEM) • X-ray Magnetic Circular Dichroism (XMCD)

  4. Key Terms • Photoelectron Emission Microscopy (PEEM) • X-ray Magnetic Circular Dichroism (XMCD)

  5. Examples of X-PEEM • Nolting, F., A. Scholl, et al. (2000). "Direct observation of the alignment of ferromagnetic spins by antiferromagnetic spins." Nature 405(6788): 767-769. • Young, A. T., A. Bartelt, et al. (2007). "An Ultrafast X-ray Detection System for the Study of Magnetization Dynamics." AIP Conference Proceedings 879(1): 1206-1209.

  6. Element Selectivity • Strong absorption peaks allow for element-selective imaging • Of particular interest, X-PEEM can image multiple layers of a 3D structure Cobalt (ferromagnet) LaFeO3 (antiferromagnet)

  7. Imaging Exchange Bias 1.2nm Co / 40nm LaFeO3 grown on SrTiO3 (001) substrate Nolting, F., A. Scholl, et al. (2000). "Direct observation of the alignment of ferromagnetic spins by antiferromagnetic spins." Nature 405(6788): 767-769.

  8. Time Resolved Images • Pump-probe technique is used to image magnetization dynamics • The time-resolution is limited by the convoluted length or rise times of both laser and X-ray pulses

  9. Ultrafast Imaging via Streak Camera Young, A. T., A. Bartelt, et al. (2007). "An Ultrafast X-ray Detection System for the Study of Magnetization Dynamics." AIP Conference Proceedings 879(1): 1206-1209.

  10. Conclusions • X-PEEM is a useful tool for exploring the static and dynamic behavior of magnetic materials • Resolution of < 20nm allows for nanoscale applications • Element selectivity makes it possible to study interactions between multiple magnetic layers • Time resolution on the order of 1-10 ps allows for ultrafast dynamic studies

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