ABSTRACT
This chapter discusses possible application of biomimetic magnetic nanoparticles (NP), namely fabrication of magnonic crystals (MC), a magnetic counterpart of photonic crystals, in which spin waves propagate instead of electromagnetic waves. The biomimetic way of NPs fabrication, that is, the use of cage-like proteins as reaction chambers, has a number of advantages. One of the most commonly studied biomimetic magnetic NPs are magnetoferritins (mFT). The chapter utilizes plane wave method (PWM) to examine the spin wave spectra in three-dimensional MCs based on mFT crystals. The idea of the PWM is to expand the dynamic functions into a series of plane waves with the use of Bloch’s theorem and apply the Fourier transformation to the periodically distributed magnetic parameters. In MCs with a substantial magnetic parameter contrast, in particular that of saturation magnetization, the amplitude of mag-netization precession in modes with the lowest frequencies tends to concentrate in one of the constituent materials.
