| 摘要 |
A magnetic force distribution on a measurement plane (91) is acquired as a magnetic force image above a sample (9) having a magnetic domain by using an MFM. Measurement is executed on a measurement plane (92) apart from the measurement plane (91) by a small distance d so as to acquire an auxiliary magnetic force image. The difference between them is divided by the small distance d so as to obtain a magnetic force gradient image. The magnetic force image and the auxiliary magnetic force image are subjected to the Fourier transform and substituted into a tertiary field acquisition expression derived from a general solution of the Laplace expression. Thus, it is possible to obtain a tertiary field indicating a magnetic force with a high accuracy. By acquiring the tertiary field, it is also possible to obtain the state of the magnetic domain on a surface (93) of a sample (9) with a high accuracy. The tertiary field acquisition method using the tertiary field acquisition expression can be applied to various fields which satisfy the Laplace expression such as a magnetic position, an electric potential, a temperature, and a gravity potential. Moreover, the tertiary field acquisition can be extended to acquisition of a higher n-dimension field. |
