1. THE ELASTIC PROPERTIES OF AMORPHOUS RIBBON AT LOW FREQUENCY MAGNETIC FIELD

2. E.V. Pan’kova, G.A. Semyannikov, V.D.Gorbunova, N.S.Perov Faculty of Physics of Moscow State University, Leninskie Gory, Moscow, 119992 Russia

3. Abstract Amorphous ribbons with different composition (Fe based and Co based) and length (from 15 to 90 cm) were used for examination of the elastic waves exited by the magnetic field as result of magnetostriction. The AC magnetic field with the amplitude 5 Oe was applied locally. A piezoelectric sensor was used to measure the vibration.

4. SAMPLES

5. The scheme of the experimental setup. 1- clips; 2 – current contacts; 3 – magnetizing coil; 4 – holder; 5 – piezoelectric sensor; 6 – amorphous ribbon.

7. The top line on both photos – the AC electric current in the magnetizing coil; the bottom line – the signal of the piezoelectric sensor: left – without external magnetic field; right – in DC magnetic field 120 Oe.

8. In amorphous alloy with the positive magnetostriction constant the vibrations were found. They depended on the frequency and the sensor position. There were no vibrations in the amorphous alloy with the negative magnetostriction constant.

9. Scheme of measurements A, B, C, D, E – sensor positions

10. The dependence of the amplitude of the ribbon vibration on the frequency for different position of the sensor, sample 1.

11. The dependence of the amplitude of the ribbon vibration on the frequency for different samples in the same position.

14. The dependence of the amplitude of the ribbon vibration on the sensor position, sample 1, F = 26.2 kHz.

15. The dependence of the amplitude of the ribbon vibration on the sensor position, sample 3, F = 17.8 kHz.

17. Conclusions The method of the small vibration control was developed The magnetoelastic vibration of the Fe- and Co-based amorphous ribbon were investigated in the frequency range from 0.1 up to 100 kHz. The standing waves were found in the Fe based amorphous ribbons. The sound velocity was measured to be 2200 m/sec.