METHOD FOR MEASURING THICKNESS OF MAGNETIC LAYER OF MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a method for measuring the thickness and its standard deviation of the magnetic layer of a high-density magnetic recording medium with high accuracy. SOLUTION: In the method for measuring the thickness of the magnetic layer of a magnetic recording medium having the magnetic layer and a nonmagnetic layer adjacent to each other, the characteristic X-ray derived from the element included in only one of the magnetic layer and the nonmagnetic layer is measured by the energy-dispersive X-ray spectroscopy on the cross section of the magnetic recording medium to obtain a characteristic X-ray image corresponding to the cross section, and then the thickness of the magnetic layer is determined from the obtained image.