Crystallographic direction related spin current transmission in MgO(001)/Fe0.79Si0.21(001)/Pt(111) epitaxial bilayers

2021 ◽  
Vol 103 (13) ◽  
Author(s):  
Jian Mao ◽  
Zhi Heng Yao ◽  
Xu Zhang ◽  
Jijun Yun ◽  
Meixia Chang ◽  
...  
Keyword(s):  
Spin Current ◽  
Crystallographic Direction ◽  
Current Transmission

scholarly journals Spin current distribution in antiferromagnetic zigzag graphene nanoribbons under transverse electric fields

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jie Zhang ◽  
Eric P. Fahrenthold
Keyword(s):  
Electric Fields ◽  
Transverse Electric ◽  
Graphene Nanoribbons ◽  
Spin Current ◽  
Differential Resistance ◽  
Current Control ◽  
Field Analysis ◽  
Current Transmission ◽  
Transverse Electric Fields ◽  
Zigzag Graphene Nanoribbons

AbstractThe spin current transmission properties of narrow zigzag graphene nanoribbons (zGNRs) have been the focus of much computational research, investigating the potential application of zGNRs in spintronic devices. Doping, fuctionalization, edge modification, and external electric fields have been studied as methods for spin current control, and the performance of zGNRs initialized in both ferromagnetic and antiferromagnetic spin states has been modeled. Recent work has shown that precise fabrication of narrow zGNRs is possible, and has addressed long debated questions on their magnetic order and stability. This work has revived interest in the application of antiferromagnetic zGNR configurations in spintronics. A general ab initio analysis of narrow antiferromagnetic zGNR performance under a combination of bias voltage and transverse electric field loading shows that their current transmission characteristics differ sharply from those of their ferromagnetic counterparts. At relatively modest field strengths, both majority and minority spin currents react strongly to the applied field. Analysis of band gaps and current transmission pathways explains the presence of negative differential resistance effects and the development of spatially periodic electron transport structures in these nanoribbons.

Long-distance spin current transmission in single-crystalline NiO thin films

2021 ◽  
Author(s):  
Tetsuya Ikebuchi ◽  
Yuta Kobayashi ◽  
Itaru Sugiura ◽  
Yoichi Shiota ◽  
Teruo ONO ◽  
...  
Keyword(s):  
Thin Films ◽  
Spin Current ◽  
Long Distance ◽  
Single Crystalline ◽  
Current Transmission

Spin current transmission in polycrystalline NiO films

2018 ◽  
Vol 11 (7) ◽  
pp. 073003 ◽  
Author(s):  
Tetsuya Ikebuchi ◽  
Takahiro Moriyama ◽  
Hayato Mizuno ◽  
Kent Oda ◽  
Teruo Ono
Keyword(s):  
Spin Current ◽  
Current Transmission ◽  
Nio Films

scholarly journals Coherent ac spin current transmission across an antiferromagnetic CoO insulator

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Q. Li ◽  
M. Yang ◽  
C. Klewe ◽  
P. Shafer ◽  
A. T. N’Diaye ◽  
...  
Keyword(s):  
Spin Current ◽  
Spin Precession ◽  
Fundamental Physics ◽  
Time Resolved ◽  
Pump Probe ◽  
Insulating Layer ◽  
X Ray ◽  
Current Transmission ◽  
Measurement Results ◽  
Probe Measurements

AbstractThe recent discovery of spin current transmission through antiferromagnetic insulating materials opens up vast opportunities for fundamental physics and spintronics applications. The question currently surrounding this topic is: whether and how could THz antiferromagnetic magnons mediate a GHz spin current? This mismatch of frequencies becomes particularly critical for the case of coherent ac spin current, raising the fundamental question of whether a GHz ac spin current can ever keep its coherence inside an antiferromagnetic insulator and so drive the spin precession of another ferromagnet layer coherently? Utilizing element- and time-resolved x-ray pump-probe measurements on Py/Ag/CoO/Ag/Fe75Co25/MgO(001) heterostructures, here we demonstrate that a coherent GHz ac spin current pumped by the Py ferromagnetic resonance can transmit coherently across an antiferromagnetic CoO insulating layer to drive a coherent spin precession of the Fe75Co25 layer. Further measurement results favor thermal magnons rather than evanescent spin waves as the mediator of the coherent ac spin current in CoO.

Study on spin current transmission of Co1-x Tb x films

2021 ◽  
Author(s):  
Li Wang ◽  
Yangtao Su ◽  
Yang Meng ◽  
Haibin Shi ◽  
Xinyu Cao ◽  
...  
Keyword(s):  
Spin Transport ◽  
Dominant Role ◽  
Spin Current ◽  
Impurity Scattering ◽  
Transmission Efficiency ◽  
Transverse Spin ◽  
Transport Efficiency ◽  
Spin Pumping ◽  
Current Transmission ◽  
Symmetry Requirement

Abstract We investigate the spin to charge conversion phenomena in Y3Fe5O12/Pt/Co1-x Tb x /Pt multilayers by both the spin pumping and spin Seebeck effects. We find that the spin transport efficiency is irrelevant to magnetization states of the perpendicular magnetized Co1-x Tb x films, which can be attributed to the symmetry requirement of the inverse transverse spin Hall effect. Furthermore, the spin transmission efficiency is significantly affected by the film concentration, revealing the dominant role of extrinsic impurity scattering caused by Tb impurity. The present results provide further guidance for enhancing the spin transport efficiency and developing spintronics devices.

Incoherent spin current

2017 ◽  
Author(s):  
K. Ando ◽  
E. Saitoh
Keyword(s):  
Diffusion Equation ◽  
Spin Density ◽  
Spin Diffusion ◽  
Spin Injection ◽  
Spin Current ◽  
Ferromagnetic Semiconductor ◽  
Electrochemical Potential ◽  
Semiconductor Interface ◽  
Interface Resistance ◽  
Inhomogeneous Spin

This chapter introduces the concept of incoherent spin current. A diffusive spin current can be driven by spatial inhomogeneous spin density. Such spin flow is formulated using the spin diffusion equation with spin-dependent electrochemical potential. The chapter also proposes a solution to the problem known as the conductivity mismatch problem of spin injection into a semiconductor. A way to overcome the problem is by using a ferromagnetic semiconductor as a spin source; another is to insert a spin-dependent interface resistance at a metal–semiconductor interface.

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