具有褶皱表面的磁性多层膜中线性及非线性表面静磁波

In these formulae,γ is the gyromagnetic ratio,and f1and f2 are used as the magnetic andnonmagnetic fractions in the multilayers,respectively.Therefore f1=d1/ ( d1+d2 ) and f2 =d2 / ( d1+d2 ) ,with d1representing the thickness of magnetic layers and d2 the thickness of nonmagneticlayers.In our previous paper[2 3 ] ,we obtained the useful non-zero components of the third-ordermagnetizations with foundation al frequencyω,for a surface magnetostatic wave propagatingalong the x axis,which arwhere…

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We investigate linear and nonlinear properties of coupled surface magnetostatic waves in magnetic superlattice films, or magnetic multilayers with a periodically corrugated surhce. On this basis of our previous work, we discuss linear and nonlinear properties of the stop-band resulting from the surface grating. The influences caused by the nonlinearity and the structure parameters (magnetic fiaction) on the coupled waves both are obvious. The nonlinear effects can lead to a downward shift of the stop-band, even make the entire stopband below cD b,which implies that bistable magnetostatic surface waves can exist. In the linear case, the Brillouin diagrams of the coupled waves show that the stop-band widens as the magnetic fraction is increased. In the nonlinear case, the stop-band changes complicatedly with the space grating period.