Study of a Microwave Ferrimagnetic Multiple Signal Conversion Process

Abstract

A multiple signal con,,:ersion P!ocess has been ~bserved in ferrimagnet ic materials at microwave frequencies. The second harmOniC of the mput frequency IS generated in a magnetized ferrite and caused to mix with th. e .fundam ent~l.rrequency in the specimen generating the harmonic. A portion of the upper side band power ar~smg from ~llIxmg o~ the fundamental frequency and its second harmonic is constructively added to the third ha~momc occurring from harmonic generation. The total output power at the third harmonic is consequently mcreased.

Propagation of nonlinearly generated harmonic spin waves in microscopic stripes

“…As the 6.5 GHz excitation is not propagating, the second harmonic wave at 13 GHz has to be generated under CPW1, by magnon confluence as previously reported. [20][21][22] We note there that the nonlinear signal have same oscillations period as the direct one. If one only measures a nonlinear generation, one will obtain peaks from the dispersion of Figures 3(b) and 1(c).…”

“…This confirms that this nonlinear process is related to magnon confluence. 20,22 We now address the signal transmitted to CPW2 when the applied magnetic field is around that for the fundamental SW mode at 6.5 GHz. In Figure 5 small oscillations with a huge baseline, the other from nonlinear excitations at f d ¼2f e where a higher number of oscillations is also observed with a small baseline.…”