MTJ etching with improved uniformity and profile by adding passivation step

D Shen, YJ Wang, J Haq - US Patent 9,887,350, 2018 - Google Patents
A hard mask stack for etching a magnetic tunneling junction (MTJ) structure is described. An
electrode layer is deposited on a stack of MTJ layers on a bottom electrode. A photoresist …

Post treatment to reduce shunting devices for physical etching process

YJ Wang, D Shen, V Sundar, S Patel - US Patent 10,297,746, 2019 - Google Patents
A method for etching a magnetic tunneling junction (MTJ) structure is described. A stack of
MTJ layers is provided on a bottom electrode. A top electrode is provided on the MTJ stack …

Magnetic tunnel junction structure

X Li - US Patent 9,029,170, 2015 - Google Patents
A magnetic tunnel junction (MTJ) device is formed by a process that includes forming a
trench in a substrate and depositing an MTJ structure within the trench. The MTJ structure …

Reverse partial etching scheme for magnetic device applications

W Yu-Jen, C Yuan-Tung - US Patent 8,748,197, 2014 - Google Patents
A magnetic tunnel junction (MTJ) structure is provided over a device wherein the MTJ
comprises a tunnel barrier layer between a free layer and a pinned layer; and a top and …

Replacement conductive hard mask for multi-step magnetic tunnel junction (MTJ) etch

Y Lu, C Park, WC Chen - US Patent 9,269,893, 2016 - Google Patents
A multi-step etch technique for fabricating a magnetic tunnel junction (MTJ) apparatus
includes forming a first conductive hard mask on a first electrode of the MTJ apparatus for …

Fabrication process for a magnetic tunnel junction device

G Stojakovic, RM Ranade, I Kasko, J Neutzel… - US Patent …, 2006 - Google Patents
(57) ABSTRACT A method of fabricating a magnetic tunnel junction (MTJ) device is
provided. A patterned hard mask is oxidized to form a Surface oxide thereon. An MTJ Stack …

Sub-lithographic patterning of magnetic tunneling junction devices

Y Lu - US Patent 9,362,336, 2016 - Google Patents
A method for fabricating a magnetic tunnel junction (MTJ) device includes creating a recess
within a second patterning layer, in which a first patterning layer overhangs the recessed …

Magnetic tunnel junction device and fabrication

X Li, SH Kang - US Patent 8,492,858, 2013 - Google Patents
MTJ elements may be used to create a magnetic random access memory (MRAM) or a spin
torque transfer MRAM (STT-MRAM). An MTJ element typically includes a pinned layer, a …

Reversed stack MTJ

WH Huang, FT Sung, CY Hsu, SC Liu… - US Patent 9,614,145, 2017 - Google Patents
An integrated circuit device includes a substrate and a magnetic tunneling junction (MTJ).
The MTJ includes at least a pinned layer, a barrier layer, and a free layer. The MTJ is formed …

Method of forming a magnetic tunnel junction structure

X Li - US Patent 7,579,197, 2009 - Google Patents
In a particular illustrative embodiment, a method of forming a magnetic tunnel junction (MTJ)
device is disclosed that includes forming a trench in a substrate. The method further includes …