Perpendicular magnetic tunnel junction with W seed and capping layers
Sun, C. L.
Price, K. C.
Khalili Amiri, P.
Wang, K. L.
Voyles, P. M.
Wang, W. G.
AffiliationUniv Arizona, Dept Phys
MetadataShow full item record
PublisherAMER INST PHYSICS
CitationPerpendicular magnetic tunnel junction with W seed and capping layers 2017, 121 (15):153902 Journal of Applied Physics
JournalJournal of Applied Physics
RightsRights managed by AIP Publishing LLC.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractWe present a study on perpendicular magnetic tunnel junctions with W as buffer and capping layers. A tunneling magnetoresistance of 138% and an interfacial magnetic anisotropy of 1.67 erg/cm(2) were obtained in optimally annealed samples. However, after extended annealing at 420 degrees C, junctions with W layers showed extremely small resistance due to interdiffusion of W into the MgO barrier. In contrast, in Ta-based junctions, the MgO barrier remained structurally stable despite disappearance of magnetoresistance after extended annealing due to loss of perpendicular magnetic anisotropy. Compared with conventional tunnel junctions with in-plane magnetic anisotropy, the evolution of tunneling conductance suggests that the relatively low magnetoresistance in perpendicular tunnel junctions is related to the lack of highly polarized Delta(1) conducting channel developed in the initial stage of annealing. Published by AIP Publishing.
Note12 month embargo; published online 20 April 2017
VersionFinal published version
SponsorsC-SPIN, one of six centers of STARnet, a Semiconductor Research Corporation program; MARCO; DARPA; National Science Foundation [ECCS-1310338]; Inston, Inc., through a Phase II Small Business Innovation Research award from the National Science Foundation