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

Bonetti, Stefano; Chen, Zhao; Kukreja, Roopali; Spoddig, Detlef; Schöppner, Christian; Meckenstock, Ralf; Ollefs, Katharina; Ney, Andreas; Pinto, Jude; Houanche, Richard; Frisch, Josef; Stöhr, Joachim; Dürr, Hermann A.; Ohldag, Hendrik

doi:10.1063/1.4930007

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

Journal Article · Tue Sep 15 00:00:00 EDT 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4930007· OSTI ID:22482781

Bonetti, Stefano; Chen, Zhao ^[1]; Kukreja, Roopali ^[2]; Spoddig, Detlef; Schöppner, Christian; Meckenstock, Ralf ^[3]; Ollefs, Katharina ^[3]; Ney, Andreas ^[3]; Pinto, Jude; Houanche, Richard; Frisch, Josef ^[4]; Stöhr, Joachim; Dürr, Hermann A. ^[2]; Ohldag, Hendrik ^[5]

Department of Physics, Stanford University, Stanford, California 94305 (United States)
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
Institut für Experimentalphysik, Universität Duisburg-Essen, Duisburg (Germany)
Linear Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
Stanford Synchrotron Radiation Laboratory, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)

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.

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OSTI ID:: 22482781

Journal Information:: Review of Scientific Instruments, Vol. 86, Issue 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748

Country of Publication:: United States

Language:: English

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The combination of micro-resonators with spatially resolved ferromagnetic resonance Schaffers, T.; Meckenstock, R.; Spoddig, D. Review of Scientific Instruments, Vol. 88, Issue 9 https://doi.org/10.1063/1.4996780	journal	September 2017
Nanoscale X-ray imaging of spin dynamics in yttrium iron garnet Förster, J.; Wintz, S.; Bailey, J. Journal of Applied Physics, Vol. 126, Issue 17 https://doi.org/10.1063/1.5121013	journal	November 2019
Coherent Excitation of Heterosymmetric Spin Waves with Ultrashort Wavelengths Dieterle, G.; Förster, J.; Stoll, H. Physical Review Letters, Vol. 122, Issue 11 https://doi.org/10.1103/physrevlett.122.117202	journal	March 2019
Extracting the Dynamic Magnetic Contrast in Time-Resolved X-ray Transmission Microscopy Schaffers, Taddäus; Feggeler, Thomas; Pile, Santa Nanomaterials, Vol. 9, Issue 7 https://doi.org/10.3390/nano9070940	journal	June 2019
Extracting the Dynamic Magnetic Contrast in Time-Resolved X-ray Transmission Microscopy Schaffers, T.; Feggeler, T.; Pile, S. arXiv https://doi.org/10.48550/arxiv.1905.12497	text	January 2019

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