Stabilization of the easy-cone magnetic state in free layers of magnetic tunnel junctions

2019 ◽  
Vol 100 (18) ◽  
Author(s):  
B. M. S. Teixeira ◽  
A. A. Timopheev ◽  
N. Caçoilo ◽  
S. Auffret ◽  
R. C. Sousa ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic State ◽  
Magnetic Tunnel Junctions

scholarly journals Nanoscale true random bit generator based on magnetic state transitions in magnetic tunnel junctions

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Alex S. Jenkins ◽  
Lara San Emeterio Alvarez ◽  
Paulo P. Freitas ◽  
Ricardo Ferreira
Keyword(s):  
Tunnel Junctions ◽  
Magnetic State ◽  
Magnetic Tunnel Junctions ◽  
Vortex State ◽  
Magnetic Vortex ◽  
State Transitions ◽  
Free Layer ◽  
Plane Field ◽  
Random Bit Generator ◽  
Ac Current

Abstract We present an investigation into the in-plane field induced free layer state transitions found in magnetic tunnel junctions. By applying an ac current into an integrated field antenna, the magnetisation of the free layer can be switched between the magnetic vortex state and the quasi-uniform anti-parallel state. When in the magnetic vortex state, the vortex core gyrates a discrete number of times, and at certain frequencies there is a 50% chance of the core gyrating n or n − 1 times, leading to the proposal of a novel nanoscale continuous digital true random bit generator.

Voltage dependence of the magnetic state in magnetic tunnel junctions

2000 ◽  
Vol 87 (9) ◽  
pp. 5221-5223 ◽  
Author(s):  
C. Heide ◽  
A. I. Krikunov ◽  
Yu. F. Ogrin ◽  
P. E. Zilberman ◽  
R. J. Elliott
Keyword(s):  
Voltage Dependence ◽  
Tunnel Junctions ◽  
Magnetic State ◽  
Magnetic Tunnel Junctions

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

scholarly journals Exceeding 400% tunnel magnetoresistance at room temperature in epitaxial Fe/MgO/Fe(001) spin-valve-type magnetic tunnel junctions

2021 ◽  
Vol 118 (4) ◽  
pp. 042411
Author(s):  
Thomas Scheike ◽  
Qingyi Xiang ◽  
Zhenchao Wen ◽  
Hiroaki Sukegawa ◽  
Tadakatsu Ohkubo ◽  
...  
Keyword(s):  
Room Temperature ◽  
Tunnel Junctions ◽  
Spin Valve ◽  
Magnetic Tunnel Junctions ◽  
Tunnel Magnetoresistance
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