Our research explores the
injection, transport, detection, and functionality of
spin currents in lithographically patterned mesoscopic
metallic structures commonly known as nonlocal spin
valves (NLSVs). A unique feature of the NLSV system is
that a pure spin current, without a net charge
current, can be generated. A pure spin current can be
technologically useful because of its non-invasive and
energy efficient nature. It also allows for detailed
studies of the ubiquitous spin relaxation processes in
materials. Efforts have been dedicated to enhancing
the spin injection efficiency across interfaces and
the spin relaxation lengths in materials, and
encouraging results have been systematically achieved.
Other recent and ongoing research topics include spin
transfer torque (STT) switching by a pure spin
current, the spin-Hall effects, anisotropic spin
relaxation and its origin, tunability of spin current,
and quantitative understanding of the Kondo spin
Work in the Mesoscopic
Spintronics Lab is heavily experimental and hands on.
Researchers use advanced instrumentation such as thin
film deposition systems, electron-beam lithography,
microscopy, and variable temperature magneto-transport
systems. Some experimental systems were designed,
assembled, and programmed by Yi Ji and his students.
In addition to our own laboratory equipment, we also
rely on the University of Delaware
Nanofabrication Facilities (UDNF).
Yi Ji's professional
publications can be accessed via the google scholar,
ORCiD, or Web of Science researcher profile link
Ph.D. Recipients Supervised