Abstract
Ultrasonic stress waves influence the state-of-magnetization; this effect can be used (up to the Curie temperature) to observe the energy distribution of ultrasonic fields for energy densities up to 1010 erg/cm3.1 Application of intense ultrasound reveals relations between magnetostriction and Young's modulus, while the inverse magnetostrictive effect detects phase transitions and certain phenomena associated with the internal structure of metal crystals. By using ferromagnetic thin films, one may investigate these relations and phenomena in situ in an electron microscope. At the same time, thin-film techniques extend the range of materials to nonferromagnetics and it is possible to combine direct microscopy of such internal structures as dislocations with the observation of damping of ultrasound at substructures. Results from these in situ observations carried out in a Siemens Elmiskop I are discussed in the light of acoustic energy conversion at dislocations, and transformation of mechanical energy into magnetic energy.
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