Direct imaging of the ac component of the pumped spin polarization with element specificity

Abstract

Spin pumping in a ferromagnet/nonferromagnet heterostructure is directly imaged with spatial resolution as well as element selectivity. The time-resolved detection in scanning transmission x-ray microscopy allows to directly probe the spatial extent of the ac spin polarization in Co-doped ZnO which is generated by spin pumping from an adjacent permalloy microstrip. Comparing the relative phases of the dynamic magnetization component of the two constituents is possible and found to be antiphase. The correlation between the distribution of the magnetic excitation in the permalloy and the Co-doped ZnO reveals that laterally there is no one-to-one correlation. The observed distribution is rather complex, but integrating over larger areas clearly demonstrates that the spin polarization in the nonferromagnet extends laterally beyond the region of the ferromagnetic microstrip. Therefore the observations are better explained by a local spin pumping efficieny and a lateral propagation of the ac spin polarization in the nonferromagnet over the range of a few micrometers.

arXiv comment7 pages, 5 figures

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Cited by in corpus (5)

• Nonstanding spin waves in a single rectangular permalloy microstrip under uniform magnetic excitation
• Magnetization generated by microwave-induced Rashba interaction
• Element-specific visualization of dynamic magnetic coupling in a Co/Py bilayer microstructure
• 3D Imaging of Magnetic Domains in Nd2Fe14B using Scanning Hard X-Ray Nanotomography
• Quantifying the spin-wave asymmetry in single and double rectangular Ni${}_{80}$Fe${}_{20}$ microstrips by TR-STXM, FMR and micromagnetic simulations