Headway Technologies Assigned Patent

Headway Technologies, Inc. (TDK), Milpitas, CA, has been assigned a patent (11,031,039) developed by Tang, Yuhui, Milpitas, CA, and Liu, Ying, San Jose, CA, for “circuits and methods for optimizing write current waveform for main pole relaxation in perpendicular magnetic recording.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A preamplifier that that is configured for optimizing the write current waveform to achieve the best areal density capability (ADC) and adjacent track interference (ATI) performance of a magnetic recording disk drive. The preamplifier is configured for providing a magnetic head write current with a main pole relaxation zone for providing a buffer zone for main pole relaxation from saturation state to a remanence state before writing the next bit. The preamplifier is further configured for providing a magnetic head write current with a reference main pole relaxation current located at an end region data of each bit. The length of the reference main pole relaxation current is a function of the bit length, frequency, recording velocity, and writer/media switching speed.”

The patent application was filed on August 19, 2020 (Appl. No.16/997,161