Acta Metallurgica Sinica (English Letters) ›› 2009, Vol. 22 ›› Issue (6): 435-439.DOI: 10.1016/S1006-7191(08)60120-9

• Research paper • Previous Articles     Next Articles

Measurement of the remnant magnetic-field in Lorentz mode using permalloy

Haihua LIU1, Xiaokun DUAN2, Renchao CHE1, Zhifeng WANG1,Xiaofeng DUAN1   

  1. 1) Beijing Laboratory of Electron Microscopy, Beijing National Laboratory for Condensed Matter Physics, nstitute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    2) Advanced Technology & Materials Co., Ltd., Beijing 100081, China
  • Received:2009-01-21 Revised:2009-05-01 Online:2009-12-25 Published:2009-12-16
  • Contact: Xiaofeng DUAN

Abstract:

A novel method was reported to measure the remnant magnetic field in Lorentz mode in a FEI Tecnai F20 transmission electron microscope equipped with a Lorentz lens. The movement of the circle Bloch line of the cross-tie wall in Permalloy is used to measure the remnant magnetic field by tilting the specimen and adjusting the objective lens current. The remnant magnetic field is estimated to be about 17 Oe, in a direction opposite to that of the objective lens magnetic field. The remnant magnetic field can be compensated by adjusting the value of the objective lens current.

Key words: Lorentz electron microscopy, Lorentz lens, Remnant magnetic field, Permalloy, Cross-tie walls