Magnetic measurements in high external magnetic fields demand corresponding coercivity value of MFM tip and stability of its magnetization distribution during imaging. Obviously, applying magnetic field higher than coercivity leads to unavoidable magnetization reversal of magnetic tip and corresponding distortion of magnetic image.
Typical magnetic tips with CoCr coating usually demonstrate coercivity about 200Oe in vertical (Z) direction and 800Oe in horizontal (X or Y) direction perpendicular to the tip axis.
Novel magnetic tips based on Co high coercivity alloy (MFM_HC) posses essentially higher values – 500-800Oe in vertical direction and more than 2kOe in horizontal direction. Therefore new MFM_HC tips open new possibilities in magnetic measurements in high external magnetic fields.
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