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Our group has a long-standing interest in the thermal generation of pure
spin currents, and more generally in thermal effects on nanomagnetic systems
and materials. These areas are part of the recent and growing field of
spin caloritronics, which explores the coupling of heat, charge, and spin
degrees of freedom in materials and nanoscale structures.
Our most recent work focuses on thermal effects and thermal spin generation
in nanoscale metallic non-local spin valves. These devices, which we
fabricate in our lab using electron-beam
lithography, allow manipulation and study of pure spin currents in
metal nanowires and other materials. An example is shown below, and
more details are available in our recent papers.
a) Schematic layout of the NLSV
under electrical spin injection, where a large charge current driven through
a FM nanowire creates a spin accumulation and pure spin current in a NM
channel that is detected with a second FM. b)
The non-local resistance RNLSV=VNLE//I for a L=900 nm
device at 78 K, where the relative alignments of the two FM contacts are
indicated with paired arrows.
c) Thermal spin injection is
achieved by passing current I only
through FM1, creating a thermal gradient at the NM/FM interface that injects
spin into the NM. d) False-color
SEM micrograph of the nanoscale circuit defining the NLSV.