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Title: Microwave soft x-ray microscopy for nanoscale magnetization dynamics in the 5–10 GHz frequency range

In this study, we present a scanning transmission x-ray microscopy setup combined with a novel microwave synchronization scheme in order to study high frequency magnetization dynamics at synchrotron light sources. The sensitivity necessary to detect small changes of the magnetization on short time scales and nanometer spatial dimensions is achieved by combination of the developed excitation mechanism with a single photon counting electronics that is locked to the synchrotron operation frequency. The required mechanical stability is achieved by a compact design of the microscope. Our instrument is capable of creating direct images of dynamical phenomena in the 5-10 GHz range, with 35 nm resolution. When used together with circularly polarized x-rays, the above capabilities can be combined to study magnetic phenomena at microwave frequencies, such as ferromagnetic resonance (FMR) and spin waves. We demonstrate the capabilities of our technique by presenting phase resolved images of a –6 GHz nanoscale spin wave generated by a spin torque oscillator, as well as the uniform ferromagnetic precession with ~0.1° amplitude at –9 GHz in a micrometer-sized cobalt strip.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [3] ;  [3] ;  [5] ;  [6] ;  [6] ;  [6] ;  [6] ;  [6] ;  [6]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Stockholm Univ., Stockholm (Sweden)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Univ. Duisburg-Essen, Duisburg (Germany)
  4. Univ. Duisburg-Essen, Duisburg (Germany); European Synchrotron Radiation Facility, Grenoble Cedex (France)
  5. Univ. Duisburg-Essen, Duisburg (Germany); Johannes Kepler Univ., Linz (Austria)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
OSTI Identifier:
1326852
Report Number(s):
SLAC-PUB--16710
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 9; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY spin waves; X-ray optics; magnetization dynamics; microwave sources; X-ray microscopes