Nonlinear domain-mode ferromagnetic resonances in garnet films with perpendicular anisotropy

Nonlinear Collective Excitations for a Periodic Array of Domain Walls in Garnet Films with Perpendicular Anisotropy

“…These effects have been experimentally observed both for the domain mode resonances [7] and for the lowest-frequency DW mode resonance [8,9]. In addition, it has been recently shown that a correct description of the power dependences of the resonance shift and the line broadening in a phenomenological approach requires to take into account a nonlinear damping parameter [7,9]. Further increasing the amplitude of the pumping field results in a possible parametric excitation of DW waves with k 0 through a three-DW-wave interaction mechanism (equivalent to the first-order Suhl instability for the ferromagnetic resonance (FMR) [10]) or a four-DW-wave interaction process (second-order Suhl instability for the FMR [10]) as theoretically analyzed [11] and revealed using a magneto-optic detection [12].…”

“…Restricting to the domain mode resonances and the translational DW resonances, the lowest-order nonlinear process takes place in the weakly nonlinear regime characterized by a frequency shift (redshift) of the resonance lines accompanied with an asymmetric line broadening. These effects have been experimentally observed both for the domain mode resonances [7] and for the lowest-frequency DW mode resonance [8,9]. In addition, it has been recently shown that a correct description of the power dependences of the resonance shift and the line broadening in a phenomenological approach requires to take into account a nonlinear damping parameter [7,9].…”

Magnetization enhanced the multiple magnetic domain-dominated resonance modes in stripe domain films

“…A detailed discussion of the six resonant modes and developing a physical picture of their field dependence is beyond the scope of this work. However, from recent magnetic domain resonance data in SD films [9,12,28,34,85], it can be deduced that mode f 1 mainly originates from Bloch domain walls, while mode f 2 is located in the region between the Bloch domain walls and the basic domains. Mode f 3 mainly arises from the interior of the basic domains, mode f 4 mainly from the resonance in the Néel-type flux closure caps, and mode f 6 mainly from the region between the Néel-type flux closure caps and the basic domains.…”

“…For a film with in-plane uniaxial magnetic anisotropy, they always show one resonant peak (Kittel FMR mode) and the whole M s of film contributes to the resonant peak [4][5][6][7]. In the case of SD film, the saturation magnetization is replaced by the magnetization of the resonant region, and the resonant intensity is proportional to the magnetization of the resonant region [9,15,16,19,22]. For the intensity variation of AM permeability shown in figures 5(b)-(e), the total magnetizations of these samples are similar (see the M s value in figure 6(j)).…”

“…Recently, stripe domain (SD) film with antiparallel, coupled domains has attracted great attention in magnetic domain, domain wall, and spin wave resonances due to their special magnetic domain configurations [9,10]. The typical features of this domain structure are that the magnetic domains of the sample appear in periodic stripes, and the magnetic moments along the stripe direction exhibit the same orientation while the magnetic moments perpendicular to the stripe direction align alternately up and down 3 .…”