Noise from anhysteretic remanence in magnetic tapes

A technique is described for producing anhysteretic remanent magnetization (ARM) in situ on an endless loop tape recorder. A comparison of noise from ARM with dc noise, arising from room temperature isothermal remanent magnetization (IRM) is presented in the form of demagnetization curves. By these methods, tape properties can be studied under conditions simulating "ideal" ac biased recording.