磁気テープを用いた磁気力顕微鏡プローブモデルの検討

抄録

A magnetic force microscope (MFM) study was carried out for two kinds of 8-mm video tape recorded sinusoidally at frequencies of 0.5 to 9 MHz. The observed MFM response decreased rapidly with increasing recording frequency except in the low-frequency range. To explain the result, two models of MFM tips were considered. One, the conventional point-dipole model, was unable to explain it. The other, which takes account of the real magnetic volume of the tip, showed a better fit. The models were also used to predict qualitatively the recording frequency dependence of the residual magnetization of the recorded tapes from the spacing-height-dependence data of the MFM response. The former showed an unreasonable frequency dependence of the residual magnetization, while the latter showed a reasonable dependence.