Patent ID: 6407545
Filing Date: 2002-06-18
Classification: G01R

Abstract:
An apparatus for measuring magnetic characteristics of a magnetic recording material, the apparatus comprising:a pulse magnetic field applying unit for applying a rapidly-changing pulse magnetic field of positive or negative polarity to said magnetic recording material; a measurement unit for measuring a residual magnetization of said magnetic recording material; and a saturation-state determining unit for determining whether the residual magnetization of said magnetic recording material measured by said measurement unit is in a saturated state or not, wherein said pulse magnetic field applying unit applies said magnetic field of positive polarity to said magnetic recording material, said measurement unit measures said residual magnetization of said magnetic recording material, and said saturation-state determining unit determines whether said measured residual magnetization is in said saturated state or not, wherein when said saturation-state determining unit determines that said measured residual magnetization is not in said saturated state, then application of said magnetic field of positive polarity by said pulse magnetic field applying unit, measurement of said residual magnetization by said measurement unit, and determination by said saturation-state determining unit are repeated until said saturation-state determining unit determines that said measured residual magnetization is in the saturated state, and wherein when said saturation-state determining unit determines that said measured residual magnetization is in said saturated state, then said pulse magnetic field applying unit applies said magnetic field of negative polarity to said magnetic recording material, and said measurement unit measures said residual magnetization of said magnetic recording material.