In situ heat treatment of ultrathin MgO layer for giant magnetoresistance ratio with low resistance area product in CoFeB/MgO/CoFeB magnetic tunnel junctions

2008 ◽  
Vol 93 (19) ◽  
pp. 192109 ◽  
Author(s):  
Shinji Isogami ◽  
Masakiyo Tsunoda ◽  
Kojiro Komagaki ◽  
Kazuyuki Sunaga ◽  
Yuji Uehara ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Giant Magnetoresistance ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Low Resistance ◽  
Magnetoresistance Ratio ◽  
Area Product ◽  
In Situ Heat Treatment

High Magnetoresistance Ratio and Low Resistance–Area Product in Magnetic Tunnel Junctions with Perpendicularly Magnetized Electrodes

2010 ◽  
Vol 3 (5) ◽  
pp. 053003 ◽  
Author(s):  
Kay Yakushiji ◽  
Kenji Noma ◽  
Takeshi Saruya ◽  
Hitoshi Kubota ◽  
Akio Fukushima ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Low Resistance ◽  
Magnetoresistance Ratio ◽  
Area Product

High output voltage of magnetic tunnel junctions with a Cu(In0.8Ga0.2)Se2semiconducting barrier with a low resistance–area product

2016 ◽  
Vol 10 (1) ◽  
pp. 013008 ◽  
Author(s):  
Koki Mukaiyama ◽  
Shinya Kasai ◽  
Yukiko K. Takahashi ◽  
Kouta Kondou ◽  
Yoshichika Otani ◽  
...  
Keyword(s):  
Output Voltage ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Low Resistance ◽  
Area Product ◽  
High Output Voltage ◽  
High Output

Magnetic tunnel junctions with a rock-salt-type Mg1−xTixO barrier for low resistance area product

2016 ◽  
Vol 108 (24) ◽  
pp. 242416 ◽  
Author(s):  
Ikhtiar ◽  
S. Kasai ◽  
P.-H. Cheng ◽  
T. Ohkubo ◽  
Y. K. Takahashi ◽  
...  
Keyword(s):  
Rock Salt ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Low Resistance ◽  
Area Product

Surface Morphology of Epitaxial Magnetic Tunnel Junctions

2007 ◽  
Vol 7 (1) ◽  
pp. 255-258
Author(s):  
M. Mizuguchi ◽  
Y. Suzuki ◽  
T. Nagahama ◽  
S. Yuasa
Keyword(s):  
Surface Morphology ◽  
Flat Surface ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Magnetoresistance ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Magnetoresistance Ratio

The surface morphology of epitaxial Fe(001)/MgO(001)/Fe(001) magnetic tunnel junctions, which show the giant tunneling magnetoresistance effect, was investigated by in situ scanning tunneling microscopy. It was observed that an epitaxial MgO barrier layer forms flat surface structures. The surface was flatter with distinct steps and terraces after annealing, which would lead to an increase of the tunneling magnetoresistance ratio. Examination of the local electronic structures of 1.05-nm-thick MgO barrier layers by scanning tunneling spectroscopy revealed no pinholes in the layers, so they would be perfect barriers in magnetic tunnel junctions.

Low-resistance magnetic tunnel junctions by in situ natural oxidation

2001 ◽  
Vol 89 (1) ◽  
pp. 482-487 ◽  
Author(s):  
H. Boeve ◽  
J. De Boeck ◽  
G. Borghs
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Low Resistance

scholarly journals Magnetic Tunnel Junctions with Low Resistance-area Product of 0.5 Ωμm2

2010 ◽  
Vol 34 (3) ◽  
pp. 311-315 ◽  
Author(s):  
Y. Uehara ◽  
A. Furuya ◽  
K. Sunaga ◽  
T. Miyajima ◽  
H. Kanai
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Low Resistance ◽  
Area Product

Ultra-Low Resistance-Area-Product in CoFeB/MgO/CoFeB Magnetic Tunnel Junctions

2006 ◽  
Author(s):  
Y. Nagamine ◽  
H. Maehara ◽  
K. Tsunekawa ◽  
D. D. Djayaprawira ◽  
N. Watanabe ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Low Resistance ◽  
Area Product

CoFeB/MgO/CoFeB Magnetic Tunnel Junctions with Low Resistance-Area Product and High Magnetoresistance

2009 ◽  
Author(s):  
H. D. Gan ◽  
K. Mizunuma ◽  
S. Ikeda ◽  
H. Yamamoto ◽  
K. Miura ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Low Resistance ◽  
Area Product

scholarly journals Additive Manufacturing of Ti-Based Intermetallic Alloys: A Review and Conceptualization of a Next-Generation Machine

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4317
Author(s):  
Thywill Cephas Dzogbewu ◽  
Willie Bouwer du Preez
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Additive Manufacturing ◽  
Complex Geometries ◽  
Intermetallic Alloys ◽  
Tial Alloys ◽  
Conventional Methods ◽  
Manufacturing Technologies ◽  
In Situ Heat Treatment

TiAl-based intermetallic alloys have come to the fore as the preferred alloys for high-temperature applications. Conventional methods (casting, forging, sheet forming, extrusion, etc.) have been applied to produce TiAl intermetallic alloys. However, the inherent limitations of conventional methods do not permit the production of the TiAl alloys with intricate geometries. Additive manufacturing technologies such as electron beam melting (EBM) and laser powder bed fusion (LPBF), were used to produce TiAl alloys with complex geometries. EBM technology can produce crack-free TiAl components but lacks geometrical accuracy. LPBF technology has great geometrical precision that could be used to produce TiAl alloys with tailored complex geometries, but cannot produce crack-free TiAl components. To satisfy the current industrial requirement of producing crack-free TiAl alloys with tailored geometries, the paper proposes a new heating model for the LPBF manufacturing process. The model could maintain even temperature between the solidified and subsequent layers, reducing temperature gradients (residual stress), which could eliminate crack formation. The new conceptualized model also opens a window for in situ heat treatment of the built samples to obtain the desired TiAl (γ-phase) and Ti3Al (α2-phase) intermetallic phases for high-temperature operations. In situ heat treatment would also improve the homogeneity of the microstructure of LPBF manufactured samples.

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