Spin-orbit transport in novel topological materials

Lead Research Organisation: University College London
Department Name: London Centre for Nanotechnology

Abstract

The precise and efficient control of electrons' spins within solid states is the Holy Grail and promises an array of revolutionary clean-energy technologies. We discovered that the spin-orbit interaction provides fast and efficient controls of spins, which can be a building-block technology for novel electronic devices storing/operating data in spins. On this project, we will understand materials science for the spin-orbit magnetic controls and later demonstrate low-power control of magnetic switching in proto-type devices. We will also explore to grow and examine "topological" thin-film materials that will potentially be revolutionise the magnetic switching technology as well as other quantum technologies.
Aims and objectives
The specific objectives for this project are:
1. to reveal the symmetry and magnitude of spin-textures in the epitaxial half-Heusler films, by applying my spin-texture measurement techniques, in particular, to achieve that our techniques can electrically identify topological states through the nature of their spin textures.

2. to achieve to control the spin-textures and the topological states by their intrinsic (bulk band characteristics) and extrinsic (doping and growth-induced strain) material parameters.

3. finally, to demonstrate an unprecedentedly efficient magnetisation switching by the spin-textures.
Novelty of the research methodology
This research project is novel because we will explore new materials groups for new magnetisation switching technology. Applying our spin-dynamics techniques is also unique and we will expect a significant advancement in our knowledge of the spin-orbit interaction with which to predict and control the materials properties for new magnetisation switching technology.
Alignment to EPSRC's strategies and research areas
Smart, flexible and clean-energy technologies
The Moore's Law, that has driven the current semiconductor information technologies over the past decades, found its end in 2016 [1]. Yet, the world is demanding more-connected (such as IoT), high-density-high-power (such as SNS data centres as well big-data technologies) performances to current and future electronics. This project can explore radically new data processing methods based on spins and can lead to future clean-energy technologies that offer high-density, low-power consumptions in worldwide energy uses in electronics.
[1] M. M. Waldrop, "More than Moore," Nature 530, 144-147 (2016).

Quantum Technologies
Topological materials that we will search for will potentially be used for a platform that can host "Majorana fermions". Majorana fermions are fermionic particles which are their own antiparticles. There are a number of theoretical proposals to use the topologically-protected Majorana particles for quantum computation. Discovering of the new topological-superconducting phases in our thin-films will be of direct relevance to fundamental questions whether it is possible to produce/detect such states in solid states and to attest the theoretical proposals with the new particle states.

Any companies or collaborators involved
Industrial partner
Hitachi Cambridge Laboratory
Dr. D. A. Williams, Laboratory Manager
J. J. Thomson Avenue
CB3 0HE Cambridge
United Kingdom
Research collaborators
Prof Hideo Hosono and Prof Hideya Hiramatsu
Tokyo Institute of Technology, Japan

Publications

10 25 50

Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/R512400/1 01/10/2017 30/09/2021
1935145 Studentship EP/R512400/1 26/09/2017 30/09/2021 Aakanksha Sud
 
Description The work involves the study of low power control of magnetic switching in proto type devices. The key finding for this work is anisotropic damping and manipulation by electrical means. Precise control of damping is highly required for fast and efficient magnetic switching in memory devices. The ability to tailor the damping in a single device can allow for controlling read and write memory operations. Another important finding is the the control of magnon magnon coupling which can allow for efficient high speed memory and logic devices at room temperature..
Exploitation Route The achievements can help in building efficient logic/memory devices and potentially help in magnetic switching and other quantum technologies.
Sectors Electronics

 
Description Academic Collaboration 
Organisation Tohoku University
Country Japan 
Sector Academic/University 
PI Contribution The involves collaboration at Tohoku university ( Mizukami group) , Prof Hideo Hosono and Prof Hiramatsu( Tokyo Institute of Technology, Japan) and Dr D.A. Williams( Cambridge university , UK). The discussion about experimental results and experimental plans were carried on by both organisations.
Collaborator Contribution Experimental Discussion, Sample fabrication , Experimental Plans.
Impact Work is going on for paper publication. The work is multidisciplinary involving engineering and science fields.
Start Year 2019
 
Description Academic Collaboration 
Organisation Tokyo Institute of Technology
Country Japan 
Sector Academic/University 
PI Contribution The involves collaboration at Tohoku university ( Mizukami group) , Prof Hideo Hosono and Prof Hiramatsu( Tokyo Institute of Technology, Japan) and Dr D.A. Williams( Cambridge university , UK). The discussion about experimental results and experimental plans were carried on by both organisations.
Collaborator Contribution Experimental Discussion, Sample fabrication , Experimental Plans.
Impact Work is going on for paper publication. The work is multidisciplinary involving engineering and science fields.
Start Year 2019