走査型ホールプローブ顕微鏡による永久磁石の磁区構造観察(<特集>「磁性に関連したセンシング技術の広がりとその最前線」その2-磁気イメージング-)

概要

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A scanning Hall probe microscope (SHPM) was developed to detect surface magnetic fields on a ferromagnetic sample. It can operate in strong magnetic fields of less than 1.6T in the temperature range from 20 to 300K. Surface magnetic images of ferromagnetic Sm_2Co_<17> film were observed as functions of the temperature and of a magnetic field applied perpendicular to the film plane. The nucleation and expansion process of magnetic domains was clearly measured following an increase of the external magnetic fields, while the domain distributions were hardly changed in the demagnetizing processes. A micro-Hall probe using Si-MOSFET, which is more durable than a conventional GaAs/AlGaAs probe, was also developed and installed in the SHPM. A magnetic field resolution of more than 0.05mT was realized. Si-MOSFET-type Hall probes are expected to be utilized as micro-sensors of magnetic fields in the future.
社団法人日本磁気学会の論文
2005-08-01