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

Bonetti, Stefano; Kukreja, Roopali; Chen, Zhao; Spoddig, Detlef; Ollefs, Katharina; Schöppner, Christian; Meckenstock, Ralf; 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 · Thu Sep 10 00:00:00 EDT 2015 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4930007· OSTI ID:1326852

^[1]; Kukreja, Roopali ^[2]; Chen, Zhao ^[2]; Spoddig, Detlef ^[3]; Ollefs, Katharina ^[4]; Schöppner, Christian ^[3]; Meckenstock, Ralf ^[3]; Ney, Andreas ^[5]; Pinto, Jude ^[6];

^[6]; Frisch, Josef ^[6]; Stöhr, Joachim ^[6];

^[6]; Ohldag, Hendrik ^[6]

Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Stockholm Univ., Stockholm (Sweden)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. Duisburg-Essen, Duisburg (Germany)
Univ. Duisburg-Essen, Duisburg (Germany); European Synchrotron Radiation Facility, Grenoble Cedex (France)
Univ. Duisburg-Essen, Duisburg (Germany); Johannes Kepler Univ., Linz (Austria)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1326852

Alternate ID(s):: OSTI ID: 1229661

Report Number(s):: SLAC-PUB-16710; RSINAK

Journal Information:: Review of Scientific Instruments, Vol. 86, Issue 9; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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References (27)

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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
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
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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