We demonstrated the measurement of the high frequency (HF) magnetic field of a write head with the phase detection magnetic force microscope. An amplitude-modulated current was applied to the head coil to detect the force gradient induced by the HF magnetic field. Spatial resolution of this method was higher than that of the deflection detection method previously proposed. By the phase detection method, dynamic HF magnetic fields at the poles of the write heads were clearly imaged. HF magnetic field leakage was observed along the P2 pole shape on the air-bearing surface. The frequency dependence of the write head dynamics up to 350 MHz was also investigated.
|Number of pages||3|
|Journal||Journal of Applied Physics|
|Issue number||11 II|
|Publication status||Published - 2001 Jun 1|
|Event||8th Joint Magnetism and Magnetic Materials-Intermag Conference - San Antonio, TX, United States|
Duration: 2001 Jan 7 → 2001 Jan 11