Synchronous (Lock-in) Measurement Techniques for Magnetic Contrast Enhancement in STXM

Journal Article · Fri Sep 09 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3625372· OSTI ID:21608302

Kaznatcheev, K ^[1]; Bertwistle, D ^[2]; Cheng, C; Zohar, S; Bailey, W E ^[3]

---

1. NSLS-II, Bld.703 BNL, Upton, NY 11973-5000 (United States)
2. CLS, 101 Perimeter Rd, Saskatoon, S7N0X4 (Canada)
3. Department of Applied Physics, Columbia University, New York, NY 10027 (United States)

We have explored the capabilities of synchronous ('lock-in') point detection techniques to enhance the x-ray magnetic circular dichroism (XMCD) contrast in scanning x-ray transmission microscopy (STXM) of magnetic thin-film microstructures. Local absorption contrast, measured synchronously with low-amplitude (<10 Oe) and low-frequency (<200 hz) longitudinal fields perturbing the near-remanent magnetization state, reveal a strong spatial dependence of the response, with a roll-off in frequency response above 200 Hz. In this context, synchronous measurement affords us a basis for imaging the relation between energy loss and the sweeping rate. We speculate that the lock-in approach will be uniquely suited for detailing stochastic and deterministic frequency-dependent events in the process of magnetization reversal.

• OSTI ID: 21608302
• Journal Information: AIP Conference Proceedings, Vol. 1365, Issue 1; Conference: 10. international conference on X-ray microscopy, Chicago, IL (United States), 15-20 Aug 2010; Other Information: DOI: 10.1063/1.3625372; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
ABSORPTION
AMPLITUDES
BEAM OPTICS
ENERGY LOSSES
FREQUENCY DEPENDENCE
MAGNETIC CIRCULAR DICHROISM
MAGNETIC MATERIALS
MAGNETIZATION
MICROSCOPY
MICROSTRUCTURE
SPACE DEPENDENCE
STOCHASTIC PROCESSES
THIN FILMS
X RADIATION
X-RAY SOURCES
DICHROISM
ELECTROMAGNETIC RADIATION
FILMS
IONIZING RADIATIONS
LOSSES
MATERIALS
RADIATION SOURCES
RADIATIONS
SORPTION