Magnetic tunnel junctions with yttrium oxide barrier

2003 ◽  
Vol 83 (16) ◽  
pp. 3338-3340 ◽  
Author(s):  
T. Dimopoulos ◽  
G. Gieres ◽  
S. Colis ◽  
J. Wecker ◽  
Y. Luo ◽  
...  
Keyword(s):  
Yttrium Oxide ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Oxide Barrier

Tunnel Junctions With Yttrium Oxide Barrier and Various Ferromagnetic Electrodes

2004 ◽  
Vol 40 (4) ◽  
pp. 2296-2298 ◽  
Author(s):  
T. Dimopoulos ◽  
G. Gieres ◽  
S. Colis ◽  
R. Lopez ◽  
M. Vieth ◽  
...  
Keyword(s):  
Yttrium Oxide ◽  
Tunnel Junctions ◽  
Ferromagnetic Electrodes ◽  
Oxide Barrier

Hrem Characterization of Magnetic Tunnel Junctions and Discontinuous Multilayers

1998 ◽  
Vol 4 (S2) ◽  
pp. 798-799
Author(s):  
David J. Smith ◽  
Fuding Ge ◽  
C.L. Piatt ◽  
S. Sankar ◽  
A.E. Berkowitz
Keyword(s):  
Room Temperature ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Cross Sectional ◽  
Metal Insulator ◽  
Magnetic Layers ◽  
Magnetic Metal ◽  
Oxide Barrier ◽  
Metal Layers

There is much current interest in the magnetotransport properties of systems consisting of two (or more) magnetic metal layers separated by thin insulating layers. Traditional magnetic tunnel junctions (MTJs) are comprised of simple ferromagnet-insulator-ferromagnet trilayer structures and the conductance depends on the relative alignments of the magnetizations in the two ferromagnets. In the case of discontinuous metal/insulator multilayers, negative magnetoresistance (MR) results from spindependent tunneling. In both types of systems, the tunneling phenomena are strongly influenced by the microstructure of the films, particularly the metal/insulator interfaces and the nature and uniformity of the thin oxide barrier layers. In this study, we have used cross-sectional HREM to characterize a variety of magnetic tunnel junctions and discontinuous multilayers.The MTJs were prepared by rf and dc magnetron sputtering onto thermally oxidized (100) silicon wafers at room temperature. The magnetic layers consisted of thin films of Co, Fe and/or CoFe alloys with thicknesses ∼ 30-50nm, and the barriers included MgO, HfO2, CoO, SiO2 as well as Al2O3 (thicknesses in the range 2-10nm).

Structural and magneto-transport properties of lattice-mismatched epitaxial Fe/SrO/MgO/Fe magnetic tunnel junctions

2020 ◽  
Vol 59 (10) ◽  
pp. 103001
Author(s):  
Aurelie Spiesser ◽  
Shintaro Kon ◽  
Yukiko Yasukawa ◽  
Shinji Yuasa ◽  
Hiroshi Imamura ◽  
...  
Keyword(s):  
Transport Properties ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions

scholarly journals Electrical characterisation of higher order spin wave modes in vortex-based magnetic tunnel junctions

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Alex. S. Jenkins ◽  
Lara San Emeterio Alvarez ◽  
Samh Memshawy ◽  
Paolo Bortolotti ◽  
Vincent Cros ◽  
...  
Keyword(s):  
Spin Wave ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Higher Order ◽  
Spin Torque ◽  
Micromagnetic Simulations ◽  
Higher Order Modes ◽  
Spin Diode ◽  
Super High Frequency ◽  
Wave Modes

AbstractNiFe-based vortex spin-torque nano-oscillators (STNO) have been shown to be rich dynamic systems which can operate as efficient frequency generators and detectors, but with a limitation in frequency determined by the gyrotropic frequency, typically sub-GHz. In this report, we present a detailed analysis of the nature of the higher order spin wave modes which exist in the Super High Frequency range (3–30 GHz). This is achieved via micromagnetic simulations and electrical characterisation in magnetic tunnel junctions, both directly via the spin-diode effect and indirectly via the measurement of the coupling with the gyrotropic critical current. The excitation mechanism and spatial profile of the modes are shown to have a complex dependence on the vortex core position. Additionally, the inter-mode coupling between the fundamental gyrotropic mode and the higher order modes is shown to reduce or enhance the effective damping depending upon the sense of propagation of the confined spin wave.

Interfacial Control via Reversible Ionic Motion in Battery‐Like Magnetic Tunnel Junctions

2021 ◽  
pp. 2100512
Author(s):  
Guofei Long ◽  
Qian Xue ◽  
Qiang Li ◽  
Yu Shi ◽  
Lin Li ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Ionic Motion

scholarly journals Large Inverse Tunnel Magnetoresistance in Magnetic Tunnel Junctions with an Fe3O4 Electrode

2021 ◽  
Vol 15 (3) ◽  
Author(s):  
Shoma Yasui ◽  
Syuta Honda ◽  
Jun Okabayashi ◽  
Takashi Yanase ◽  
Toshihiro Shimada ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Tunnel Magnetoresistance

Perpendicular Magnetic Tunnel Junctions with Four Anti-ferromagnetically Coupled Co/Pt Pinning Layers

2021 ◽  
pp. 1-1
Author(s):  
H. Honjo ◽  
K. Nishioka ◽  
S. Miura ◽  
H. Naganuma ◽  
T. Watanabe ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions
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