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

We present a scanning transmission x-ray microscopy setup combined with a novel microwave synchronization scheme for studying high frequency magnetization dynamics at synchrotron light sources. The sensitivity necessary to detect small changes in the magnetization on short time scales and nanometer spatial dimensions is achieved by combining the excitation mechanism with single photon counting electronics that is locked to the synchrotron operation frequency. Our instrument is capable of creating direct images of dynamical phenomena in the 5-10 GHz range, with high spatial 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] ;  [3] ;  [2] ; ; ;  [4] ;  [4] ;  [5] ;  [4] ;  [6] ; ; ;  [7] ; ;  [3] ;  [8]
  1. Department of Physics, Stanford University, Stanford, California 94305 (United States)
  2. (United States)
  3. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
  4. Institut für Experimentalphysik, Universität Duisburg-Essen, Duisburg (Germany)
  5. (France)
  6. (Austria)
  7. Linear Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
  8. Stanford Synchrotron Radiation Laboratory, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
Publication Date:
OSTI Identifier:
22482781
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; EXCITATION; FERROMAGNETIC RESONANCE; GHZ RANGE; MAGNETIZATION; MICROSCOPY; MICROWAVE RADIATION; NANOSTRUCTURES; OSCILLATORS; SENSITIVITY; SOFT X RADIATION; SPIN WAVES; SYNCHRONIZATION; SYNCHROTRONS