Abstract
This paper shows how X-ray transmission microscopy can provide spatial mapping of spin accumulations in a thin layer of copper, which are generated without any directly applied charge currents through spin pumping from ferromagnetic magnetization dynamics in adjacent permalloy.
Highlights
Spin currents have been regarded as key ingredients for future energy-efficient electronic devices [1]
Lower microwave excitation power, the x-ray magnetic circular dichroism (XMCD) signal are too weak for a meaningful exploration of the power-dependence of these signals
A uniform excitation contrast was observed at the stripe area for f = 4.5 GHz, indicating spin accumulations in Cu induced by the spinpumping effect
Summary
Spin currents have been regarded as key ingredients for future energy-efficient electronic devices [1]. Spin currents can be generated by passing an initially unpolarized charge current through a metallic ferromagnet, for example, in a spin-valve structure [2] or magnetic tunnel junction [3,4]. The charge flow carries a net spin polarization and is known as a spin-polarized current. Mechanisms relying on spin-orbit coupling, such as spin Hall effects [5,6], or magnon excitations, such as spin pumping [7,8] and spin Seebeck effect [9], allow the decoupling of the charge and spin currents and the generation of a “pure spin current,” via charge currents, microwave excitations, or thermal gradients.
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