Experimental study of the head/medium magneto dynamics in perpendicular recording

Strain imaging of a perpendicular recording head in a Hard Disk Drive

“…Magnetic properties of heads in a hard disk drive (HDD) have been observed by optical methods using Kerr [15,16], electron microscopes [17], magnetic force microscopy (MFM) [18], and so on [19]. Meanwhile, strain imaging observes the phenomena that magnetic fields provided by the write head itself deform magnetic poles and other parts.…”