Headway Technologies (TDK) Assigned Patent

Headway Technologies, Inc., Milpitas, CA, has been assigned a patent (10,115,415) developed by Tang, Yuhui, Milpitas, CA, and Liu, Ying, San Jose, CA, for a “magnetic pulse recording scheme in perpendicular magnetic recording.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic pulse recording method is disclosed wherein a magnetic field is turned off for a portion, (t.sub.OFF) of a bit duration before or after total recording time is completed for each bit. Typical bit lengths of 10 nm to 50 nm must be less than the main pole down-track length, and total recording time, (t.sub.REC) must be less than the bit duration such that bit duration equals, (t.sub.REC+t.sub.OFF). In a random bit sequence, t.sub.REC may be maintained for each bit while t.sub.OFF increases as bit duration increases. The method applies to mobile hard disk drives, (HDD) with 2.5 inch disks, and to nearline HDD with 3.5 inch disks where bit durations vary from 0.3 to 1.2 ns for recording velocities between 10 and 47 m/sec. The time required to turn off the field may be <10 picoseconds, and comprise a linear or non-linear waveform.”

The patent application was filed on March 23, 2018 (15/933,486).