Dúb r a y s k á c e s t a 9 , 8 4 2 2 8 Br a t i s l a v a , S l o v a k i a Magnetic field dependences of the piezomagnetic dynamics, magnetomechanical coupling and elasticity moduli in the Fe73.5Cu1Nb3Si13.5B9 alloy in an as-quenched state and annealed in vacuum for 1 h at 450°C were investigated. The maximum value of the magnetomechanical coupling coefficient was equal to 0.15 for the as-quenched state and 0.7 after annealing at 450°C. The changes of the elasticity moduli (DE effect) from

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... ut 60 to 180 GPa were observed after annealing at this temperature. These changes are connected with magnetostriction (equal to 25.8 x 10 -8 at saturation), internal stresses, defects, mechanical, magnetic and heat treatment history.