Spin wave propagation in uniform waveguide: effects, modulation and its application

Abstract

With the advent of the post-Moore era, researches on beyond-Complementary Metal Oxide Semiconductor (CMOS) approaches have been attracted more and more attention. Magnonics, or spin wave is one of the most promising technology beyond CMOS, which magnons-quanta for spin waves-process the information analogous to electronic charges in electronics. Information transmission by spin waves, which uses the frequency, amplitude and (or) phase to encode information, has a great many of advantages such as extremely low energy loss and wide-band frequency. Moreover, using the nonlinear characteristics of spin waves for information transmission can increase the extra degree of freedom of information. This review provides a tutorial overview over the effects of spin wave propagation and recent research progress in uniform spin wave waveguide. The propagation characteristics of spin waves in uniform waveguides and some special propagation phenomena such as spin wave beam splitting and self-focusing are described by combining experimental phenomena and theoretical formulas. Furthermore, we summarize methods for modulating propagation of spin wave in uniform waveguide, and comment on the advantages and limitations of these methods. The review may promote the development of information transmission technology based on spin waves.

Magnon Confinement in an All-on-Chip YIG Cavity Resonator Using Hybrid YIG/Py Magnon Barriers

“…We can explain these modes by calculating the spin-wave dispersion relation for a YIG slab with dimensions w × l with magnetization in the plane of the film, given by − where λ ex = 2 A /μ 0 M 2 is the exchange constant with A = 3.5 pJ/m, k tot 2 = k n 2 + k m 2 is the total quantized wavenumber defined by k n = nπ / w and k m = mπ / l , where n and m are the mode numbers along the width and length of the cavity, respectively. The function can be written as where , for a YIG film with thickness d .…”

“…We can explain these modes by calculating the spin-wave dispersion relation for a YIG slab with dimensions w × l with magnetization in the plane of the film, given by − f = γ μ 0 2 π ( false( H + H a + λ e x k t o t 2 M false) false( H + H a + λ e x k t o t 2 M + M double-struckF false) ) 1 / 2 where λ ex = 2 A /μ 0 M 2 is the exchange constant with A = 3.5 pJ/m, k tot 2 = k n 2 + k m 2 is the total quantized wavenumber defined by k n = nπ / w and k m = mπ / l , where n and m are the mode numbers along the width and length of the cavity, respectively. The function double-struckF can be written as double-struckF = double-struckP + ( 1 − P false( 1 + cos 2 ( ϕ k − ϕ M ) false) + M P false( 1 − double-struckP false) ⁡ sin 2 false( …”