Tailoring charge to spin conversion in novel materials for efficient spintronics

The charge-to-spin conversion efficiency is the crux of the future of spintronics and electronics as it enables the generation and employment of both spin and electric current in the same device. Usually, this conversion efficiency is an intrinsic material property, which cannot be easily modified without invoking chemical or structural changes in the underlying system. This thesis explores materials with nontrivial band structures as potential active spintronics materials and explores a novel method of tunable spin-to-charge conversion, which will provide extra flexibility in spintronics device design. First, we show the successful modulation of charge-spin conversion efficiency (by more than 5X) via the metal-insulator transition in a quintessential strongly correlated electron compound vanadium dioxide (VO₂). We then show that by engineering the chemical order in the newly discovered magnetic Weyl semimetal (MWSM), Co₂MnGa, we can control the spin-charge conversion. Tailoring this interconversion efficiency will lead to energy-efficient and highly tunable memory and computing devices.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2022

Author dc:creator

• Safi, Taqiyyah S.

Advisor dc:contributor.advisor

• Liu, Luqiao

Statement dc:rights

• In Copyright - Educational Use Permitted
• Copyright MIT

Licence dc:rights.uri

• http://rightsstatements.org/page/InC-EDU/1.0/

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/147379

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/147379