Measurement of damping in magnetic materials by optical heterodyne interferometry

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:268

Article

Chicharro, JM ; Bayón, A ; Salazar, F

关键词: damping;    elastic constants;    resonance;    interferometry;    speckle;   

DOI  :  10.1016/S0304-8853(03)00546-8

来源: Elsevier

【 摘 要 】

A study of damping and its field-dependence in magnetic materials is presented. An optical heterodyne interferometer is used as detector of the longitudinal vibration of a slender rod located within a solenoid. Two different experiments are carried out in order to investigate damping in the demagnetized and saturated states. In one, the attenuation constant is determined by examining the free vibration of the sample. In the other, damping is indirectly measured from the sharpness of its resonance curve. Logarithmic decrement and its variation with the magnetic field is calculated. The detection and excitation systems used do not interact with the sample. Nickel rods and wires ranging in diameter from 2 to 10 mm are used as samples. Young's modulus is also determined. (C) 2003 Elsevier B.V. All rights reserved.

【 授权许可】

Free