Design and commissioning of an aberration-corrected ultrafast spin-polarized low energy electron microscope with multiple electron sources

Wan, Weishi; Yu, Lei; Zhu, Lin; Yang, Xiaodong; Wei, Zheng; Liu, Jefferson Zhe; Feng, Jun; Kunze, Kai; Schaff, Oliver; Tromp, R. M.; Tang, Wing Man

doi:10.1016/j.ultramic.2016.12.019

Cited by 12 publications

(1 citation statement)

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“…10 Implementing a spin-polarized source into an ultrafast electron microscope would allow for a novel approach to studying magnetic nanostructures at the fs-scale. 11 In this work, we present a fast, localized, spin-polarized source of electrons obtained from a sharp p-GaAs bulk [110] crystal shard illuminated with femtosecond laser light. The size of the emission site is approximately 1 µm in scale, and the electron polarization achieved so far is 13 %.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond-laser-induced spin-polarized electron emission from a GaAs tip

Brunkow

Jones

Batelaan

et al. 2019

Applied Physics Letters

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It is shown that focusing circularly-polarized 800 nm light pulses of 100 fs duration on the tips of p-GaAs crystalline shards having no negative electron affinity (NEA) activation results in electron emission that is both fast and spin-polarized. The 400 fs duration of the emission process was determined by pump/probe measurements. The three samples we investigated produced electron polarizations of 13.1(9) %, 13.3(7) %, and 10.4(2) %. Emission currents ranged between 50 pA and 3 nA with a sample bias of −100 V and average laser power of 100 mW. The electron emission exhibited linear dichroism and was obtained under moderate vacuum conditions, similar to that of metallic tips. This source of spin-polarized electron pulses is "fast" in the sense that the electron emission process is of comparable duration to the laser pulses that initiate it.

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Section: Introductionmentioning

confidence: 99%