Dynamic write field test for a perpendicular recording head

A method of testing a dynamic write field of a recording head, the method comprising:

• preparing a test magnetic medium;
• recording a write signal on the test magnetic medium with the write signal being set at an amplitude of a write current and a pulse width;
• capturing an average of multiple read-back signals of the recorded write signal to determine an average amplitude of the read-back signals, wherein the average amplitude of the read-back signals is related to write current;
• and
• repeating the recording of the write signal on the test magnetic medium and the capturing of the average of multiple read-back signals of the recorded write signal to determine the average amplitude of the read-back signals by fixing the amplitude of the write current and changing the pulse width of the write signal until the average amplitude of the read-back signals saturates.

A method of testing a dynamic write field of a recording head, the method comprising:

• preparing a test magnetic medium;
• recording a write signal on the test magnetic medium with the write signal being set at a pulse width and an amplitude of a write current;
• capturing an average of multiple read-back signals of the recorded write signal to determine an average amplitude of the read-back signals, wherein the average amplitude of the read-back signals is related to write current;
• and
• repeating the recording of the write signal on the test magnetic medium and the capturing of the average of multiple read-back signals of the recorded write signal to determine the average amplitude of the read-back signals by fixing the pulse width of the write signal and changing the amplitude of the write current until the average amplitude of the read-back signals saturates.