Strongly enhanced spin current in topological insulator/ferromagnetic metal heterostructures by spin pumping

2015 ◽  
Vol 117 (17) ◽  
pp. 17D148 ◽  
Author(s):  
C. N. Wu ◽  
Y. H. Lin ◽  
Y. T. Fanchiang ◽  
H. Y. Hung ◽  
H. Y. Lin ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Spin Current ◽  
Ferromagnetic Metal ◽  
Spin Pumping

SPIN PUMPING IN FERROMAGNETIC MULTILAYERS

2008 ◽  
Vol 22 (30) ◽  
pp. 2909-2929 ◽  
Author(s):  
TOMOHIRO TANIGUCHI ◽  
HIROSHI IMAMURA
Keyword(s):  
Line Width ◽  
Ferromagnetic Resonance ◽  
Metal Layer ◽  
Spin Current ◽  
Theoretical Models ◽  
Ferromagnetic Metal ◽  
Transverse Spin ◽  
Spin Pumping ◽  
Ferromagnetic Metals ◽  
Penetration Depths

We present a brief review of our recent study on spin pumping in ferromagnetic multilayers. First, we present theoretical models describing spin pumping induced by ferromagnetic resonance (FMR). Then we apply the spin-pumping theory to FMR in ferromagnetic multilayers and show that the line width of the FMR spectrum depends on the thickness of the ferromagnetic metal layer which is not in resonance. We also show that the penetration depths of transverse spin current in ferromagnetic metals can be determined by analyzing the line width of the FMR spectrum. The obtained penetration depths of the transverse spin current were 3.7 nm for Py , 2.5 nm for CoFe , 12.0 nm for CoFeB , and 1.7 nm for Co , respectively.

scholarly journals Observation and control of the weak topological insulator state in ZrTe5

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Peng Zhang ◽  
Ryo Noguchi ◽  
Kenta Kuroda ◽  
Chun Lin ◽  
Kaishu Kawaguchi ◽  
...  
Keyword(s):  
Band Gap ◽  
Topological Insulator ◽  
Spin Current ◽  
Side Surface ◽  
Quantum Spin ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Dirac Semimetal ◽  
Topological States ◽  
The One ◽  
And Control

AbstractA quantum spin Hall (QSH) insulator hosts topological states at the one-dimensional (1D) edge, along which backscattering by nonmagnetic impurities is strictly prohibited. Its 3D analogue, a weak topological insulator (WTI), possesses similar quasi-1D topological states confined at side surfaces. The enhanced confinement could provide a route for dissipationless current and better advantages for applications relative to strong topological insulators (STIs). However, the topological side surface is usually not cleavable and is thus hard to observe. Here, we visualize the topological states of the WTI candidate ZrTe5 by spin and angle-resolved photoemission spectroscopy (ARPES): a quasi-1D band with spin-momentum locking was revealed on the side surface. We further demonstrate that the bulk band gap is controlled by external strain, realizing a more stable WTI state or an ideal Dirac semimetal (DS) state. The highly directional spin-current and the tunable band gap in ZrTe5 will provide an excellent platform for applications.

Spin Pumping and Temperature-Resolved Ferromagnetic Resonance in Permalloy-Topological Insulator Nanostructured Bilayers

2018 ◽  
Vol 48 (3) ◽  
pp. 1375-1379 ◽  
Author(s):  
M. D. Davydova ◽  
A. S. Pakhomov ◽  
A. N. Kuz’michev ◽  
P. M. Vetoshko ◽  
P. N. Skirdkov ◽  
...  
Keyword(s):  
Ferromagnetic Resonance ◽  
Topological Insulator ◽  
Spin Pumping

scholarly journals Spin current study of spin glass AgMn using spin pumping effect

2011 ◽  
Vol 266 ◽  
pp. 012089 ◽  
Author(s):  
R Iguchi ◽  
K Ando ◽  
E Saitoh ◽  
T Sato
Keyword(s):  
Spin Glass ◽  
Spin Current ◽  
Spin Pumping ◽  
Pumping Effect

Spin Current Generation by Spin Pumping

2016 ◽  
pp. 1481-1504
Author(s):  
Kazuya Ando ◽  
Eiji Saitoh
Keyword(s):  
Spin Current ◽  
Current Generation ◽  
Spin Pumping

Spin Pumping in a Ferromagnetic/Nonmagnetic/Spin-Sink Trilayer Film: Spin Current Termination

2012 ◽  
Vol 508 ◽  
pp. 266-270 ◽  
Author(s):  
K. Harii ◽  
Z. Qiu ◽  
T. Iwashita ◽  
Y. Kajiwara ◽  
K. Uchida ◽  
...  
Keyword(s):  
Diffusion Equation ◽  
Hall Effect ◽  
Spin Diffusion ◽  
Diffusion Length ◽  
Spin Current ◽  
Interlayer Thickness ◽  
Spin Pumping ◽  
Charge Current ◽  
Inverse Spin Hall Effect ◽  
Spin Diffusion Length

A Spin Current Generated by Spin Pumping in a Ferromagnetic/Nonmagnetic/Spin-Sink Trilayer Film Is Calculated Based on the Spin Pumping Theory and the Standard Spin Diffusion Equation. By Attaching the Spin-Sink Layer, the Injected Spin Current Is Drastically Enhanced when the Interlayer Thickness Is Shorter than the Spin Diffusion Length of the Interlayer. We Also Provided the Formula of the Charge Current which Is Induced from the Pumped Spin Current via the Inverse Spin-Hall Effect.

scholarly journals Negligible thermal contributions to the spin pumping signal in ferromagnetic metal–platinum bilayers

2020 ◽  
Vol 127 (16) ◽  
pp. 163907
Author(s):  
Paul Noël ◽  
Maxen Cosset-Cheneau ◽  
Victor Haspot ◽  
Vincent Maurel ◽  
Christian Lombard ◽  
...  
Keyword(s):  
Ferromagnetic Metal ◽  
Spin Pumping
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