SPIN-WAVE RESONANCES IN NONUNIFORMLY STRAINED FILMS OF FEBO3

Spin-wave resonances are investigated in thin films of the antiferroma gnet FeBO3 with magnetic anisotropy of the easy-plane type. It is obse rved that high-order resonances are observed only when nonuniform stre sses are created in the sample. In nonuniformly stressed samples the a ntiferromagnetic resonance lines are broadened, and against the backgr ound of this broadening spin-wave resonances are visible whose positio ns are well described within the free-particle approximation. Using th is method it is possible to resolve resonances with wave numbers simil ar or equal to 1.5X10(5) cm(-1). The presence of strong uniaxial elast ic stresses is established experimentally in nonuniformly strained fil ms. A contact mechanism for exciting spin-wave resonances is discussed . (C) 1997 American Institute of Physics.