Microwave soft x-ray microscopy for nanoscale magnetization dynamics in the 5-10 GHz frequency range.
Rev Sci Instrum
; 86(9): 093703, 2015 Sep.
Article
em En
| MEDLINE
| ID: mdl-26429444
ABSTRACT
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 â¼6 GHz nanoscale spin wave generated by a spin torque oscillator, as well as the uniform ferromagnetic precession with â¼0.1° amplitude at â¼9 GHz in a micrometer-sized cobalt strip.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Rev Sci Instrum
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos