Abstract
Spin waves are discussed as promising information carrier for beyond complementary metal-oxide semiconductor data processing. One major challenge is guiding and steering of spin waves in a uniform film. Here, we explore the use of diffractive optics for these tasks by nanoscale real-space imaging using x-ray microscopy and careful analysis with micromagnetic simulations. We discuss the properties of the focused caustic beams that are generated by a Fresnel-type zone plate and demonstrate control and steering of the focal spot. Thus, we present a steerable and intense nanometer-sized spin-wave source. Potentially, this could be used to selectively illuminate magnonic devices like nano-oscillators.
Highlights
Magnonics, i.e., the artificial manipulation of spin waves, is a flourishing field of research with many potential uses in data processing within reach [1,2,3,4]
Spin waves passing through such a Fresnel zone plate were imaged by time-resolved STXM with X-ray Magnetic Circular Dichroism (XMCD) [38] contrast
The focal spot can be moved within a 40-μm2 area behind the zone plate by changing the magnitude and tilt angle of the applied static field, as shown in Fig. 8 for experiments performed at 5.7 GHz
Summary
I.e., the artificial manipulation of spin waves, is a flourishing field of research with many potential uses in data processing within reach [1,2,3,4]. We explore the properties of diffractive optics for spin waves [20,21,22] In principle, these diffractive optics have been shown to be able to focus spin waves [23,24,25]. As an array of holes acts as a diffraction lattice for spin waves [21], a hole arrangement seems to be a promising base for the realization of a diffractive lens. We realize this idea for spin waves by using an alternating
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