US 11,839,162 B2
Magnetoresistive memory device including a plurality of reference layers
Alan Kalitsov, San Jose, CA (US); Derek Stewart, Livermore, CA (US); Bhagwati Prasad, San Jose, CA (US); and Goran Mihajlovic, 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 Jun. 25, 2021, as Appl. No. 17/358,990.
Application 17/358,990 is a continuation in part of application No. 17/203,420, filed on Mar. 16, 2021, granted, now 11,361,805.
Application 17/203,420 is a continuation in part of application No. 16/692,965, filed on Nov. 22, 2019, granted, now 11,005,034, issued on May 11, 2021.
Prior Publication US 2021/0320245 A1, Oct. 14, 2021
Int. Cl. H01F 10/32 (2006.01); G11C 11/16 (2006.01); H10B 61/00 (2023.01); H10N 50/80 (2023.01)
CPC H10N 50/80 (2023.02) [G11C 11/161 (2013.01); H01F 10/329 (2013.01); H01F 10/3254 (2013.01); H01F 10/3286 (2013.01); H10B 61/00 (2023.02); G11C 11/165 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A memory device, comprising:
a first electrode;
a second electrode;
a magnetic tunnel junction located between the first electrode and the second electrode and comprising:
a plurality of reference layers spaced apart from each other;
at least one free layer; and
a first nonmagnetic tunnel barrier layer interposed between a most proximal one of the plurality of reference layers and the at least one free layer; and
a composite synthetic antiferromagnet (SAF) structure located between the first electrode and the magnetic tunnel junction, wherein the SAF structure comprises a first superlattice, a second superlattice, and an antiferromagnetic coupling layer located between the first superlattice and the second superlattice;
wherein:
the antiferromagnetic coupling layer comprises an iridium layer;
the first superlattice comprises the first superlattice of first cobalt layers and first platinum layers; and
the second superlattice comprises the second superlattice of second cobalt layers and second platinum layers.