Dependence of sound velocity and attenuation on magnetization direction in Nickel at high fields

• Published in: The Journal of physics and chemistry of solids 1959, Vol.9 (1), p.21-27
• Main Authors: Alers, G.A., Neighbours, J.R., Sato, H.
• Format: Article
• Language: English
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/0022-3697(59)90085-X

The velocity and attenuation of 10-Mc/s sound waves in a nickle single crystal have been measured as a function of magnetic field orientation and intensity at room temperature and at 77°K. Changes in the velocity of transverse waves of the order of 0.1 per cent were observed when the crystal was rotated about a crystallographic axis in a magnetic field high enough to allow saturation of the elastic constants. Attenuation changes were also observed, but showed a different angular dependence than the velocity changes. The measurements can be explained by a phenomenological theory based on magneto-elastic coupling. Using this theory, it was possible to estimate the magnetostriction constants at 77°K. The resulting value for λ 100(λ 100= −30×10 −6) supports previous measurements which show that it goes through a minimum near 173°K.