US 11,749,299 B2
Magnetic recording devices using virtual side shields for improved areal density capability
Suping Song, Fremont, CA (US); Zhanjie Li, Pleasanton, CA (US); Terence Lam, Cupertino, CA (US); and Lijie Guan, San Jose, 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. 30, 2020, as Appl. No. 17/39,840.
Application 17/039,840 is a division of application No. 16/564,704, filed on Sep. 9, 2019, granted, now 10,832,710.
Prior Publication US 2021/0074322 A1, Mar. 11, 2021
Int. Cl. G11B 5/235 (2006.01); G11B 5/31 (2006.01); G11B 5/127 (2006.01); G11B 5/012 (2006.01); G11B 5/02 (2006.01); G11B 5/11 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/315 (2013.01) [G11B 5/012 (2013.01); G11B 5/02 (2013.01); G11B 5/1278 (2013.01); G11B 5/235 (2013.01); G11B 5/3116 (2013.01); G11B 5/3133 (2013.01); G11B 5/3143 (2013.01); G11B 5/3146 (2013.01); G11B 5/11 (2013.01); G11B 2005/0024 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A magnetic recording device, comprising:
a main pole having a first surface adjacent to a trailing gap, a second surface adjacent to the first surface, a third surface opposite the second surface, and a fourth surface adjacent to a leading gap;
a trailing shield disposed adjacent to the trailing gap; and
a side shield comprising a first layer surrounding the first surface, the second surface, and the third surface of the main pole, and a second layer surrounding surfaces of the main pole consisting of the second surface and the third surface, the second layer being disposed in contact with the first layer, wherein the first layer comprises beta phase tungsten (β-W), Pt, or beta phase tantalum (β-Ta), and wherein the second layer comprises CoFe, CoIr, NiFe, or a CoFeX alloy, where X is B, Ta, Re, or Ir.