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Demagnetization of thin film magnetic recording transducers utilizing a decreasing AC current

  • US 4,970,621 A
  • Filed: 09/09/1988
  • Issued: 11/13/1990
  • Est. Priority Date: 09/09/1988
  • Status: Expired due to Fees
First Claim
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1. In a magnetic recording and reading apparatus including a magnetic transducer having a magnetic yoke element forming a magnetic circuit and at least one read element and at least one write element, a method for controlling the random occurrence of spurious pulses induced in the read element of a magnetic transducer when the magnetic field in said transducer elements decays from a metastable, non-zero remanent state to a stable remanent state resulting in a net change of magnetic flux through the transducer read element, said method comprising the step of applying an alternating current having a first value through said transducer write coil while decreasing said alternating current to a second value less than said first value.

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