公开(公告)号：DE3176223D1

公开(公告)日：1987-07-02

申请号：DE3176223

申请日：1981-08-05

Applicant: IBM DEUTSCHLAND ,  IBM

Inventor： BRUNSCH ARWED DR ,  RUH WOLF-DIETER ,  TRIPPEL GERHARD DR

IPC: G11B5/66 ,  G11B5/62 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  H01F41/26

公开(公告)号：DE2961717D1

公开(公告)日：1982-02-18

申请号：DE2961717

申请日：1979-10-31

Applicant: IBM

Inventor： TRIPPEL GERHARD DR ,  BRUNSCH ARWED DR ,  RUH WOLF-DIETER ,  SCHNEIDER JOCHEN

IPC: G01R33/18

Abstract: Direct method for measuring the magnetostriction constant lambda s of soft magnetic and isotropic magnetic materials. A thin film sample is cantilevered and clamped at one edge. Under the influence of a magnetic AC field and the magnetostriction effect of the sample material, the free end of the cantilevered sample is deflected and oscillates with twice the frequency of the AC field. The resonance amplitude ares is measured by using a laser beam impinging upon the oscillating sample and measuring the reflected beam amplitude by means of a position-sensitive photodiode. The AC output signal of the photodiode is proportional to the sample amplitude. The magnetostriction constant lambda s is directly proportional to the resonance amplitude ares multiplied by a constant factor which depends on known geometry and properties of the sample material.