Abstract
In this article, we describe a magnonic crystal formed by magnetite nanoparticles. The periodic strip-like structure of the nanoparticles was fabricated on the surface of thin yttrium iron garnet single-crystal film grown on a gallium–gadolinium garnet substrate via dip-coating techniques. It was shown that such periodic structure induces the formation of the bandgaps in the transmission spectra of magnetostatic surface spin-waves (MSSW). The structure was simulated by the transfer matrix method. Spin-wave detection has been carried out by using a pair of microwave antennas and a vector network analyzer.
Highlights
Magnonic crystals (MCs) and the behavior of spin-waves propagating inside them have attracted significant attention in recent years [1,2,3,4,5]
The most studied MC is built from thin yttrium iron garnet (YIG) films with a chemically etched array of parallel grooves on the surface that has been the most popular media to implement MCs due to their particular characteristics and performance [9,10,11]
We show that MC can be created by the deposition of periodic micro-structured strips of magnetite nanoparticles (NPs)
Summary
Magnonic crystals (MCs) and the behavior of spin-waves propagating inside them have attracted significant attention in recent years [1,2,3,4,5]. The different techniques for producing such magnonic devices have been based on chemical etching, metal deposition, ion implantation, and many other methods that can introduce a periodic variation of any magnetic parameter [6,7,8,9,10,11,12,13,14]. To their phononic and photonic counterparts, the presence of a periodic structure in MCs results in the formation of artificially tailored bandgaps, wherein spin-wave propagation is not permitted. The theoretical investigation and experimental observation of band gaps have been reported, including current-controlled magnonic crystals [8,16], optically controlled structures [15], one-dimensional magnonic crystals of different magnetic heterostructures [17], MC created by the ion implantation [18], and different kinds of
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