US 12,347,467 B2
DC and synchronized energy assisted perpendicular magnetic recording (EPMR) driver circuit for hard disk drive (HDD)
Joey M. Poss, Rochester, MN (US); Yunfei Ding, Fremont, CA (US); and John T. Contreras, Palo Alto, CA (US)
Assigned to Western Digital Technologies, Inc., San Jose, CA (US)
Filed by Western Digital Technologies, Inc., San Jose, CA (US)
Filed on Sep. 14, 2023, as Appl. No. 18/467,045.
Claims priority of provisional application 63/409,059, filed on Sep. 22, 2022.
Prior Publication US 2024/0105217 A1, Mar. 28, 2024
Int. Cl. G11B 5/02 (2006.01)
CPC G11B 5/02 (2013.01) 22 Claims
OG exemplary drawing
 
1. A data storage device comprising:
a storage medium;
a head configured to write data to the storage medium, the head comprising a first write assist element, a second write assist element, and a write pole; and
control circuitry for driving the head, the control circuitry comprising one or more processing devices that are configured, individually or in combination, to:
apply a write data current (Iw) to the write pole;
apply, to the first write assist element, a first write assist current (Im) that is synchronized to the write data current (Iw); and
apply a second write direct current (DC) assist current (Imdc) to the second write assist element.