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Spin Caloritronics III
“Spintronics” is the science and technology of harnessing the electron spin degree of freedom in circuits and devices in order to realize new or improved technological functionalities. The focus of attention in “Caloritronics” is the control of temperature gradients and the corresponding thermoelectric phenomena in small structures. “Spin Caloritronics” is defined by the intersection of both fields.
The first Spin Caloritronics conference has been held at the Lorentz Center in 2009 by the same organizers. It is clear that the Lorentz Center has been an important incubator of the field. In 2009 the international community interested in this emerging field was still rather small. Some arm-twisting and financial support was necessary to attract the main players at that time. In contrast, two years later we had to disappoint many potential contributors since the Center was filled to a rim in spite of the limited financial support we were able to provide. Clearly the field has by now outgrown the Lorentz Center and future conference will undoubtedly be held on a larger scale. We interpret this history as a confirmation of the important role the Lorentz Center can play in advancing science.
The workshop was organized in terms of topical session with expert invited speakers, and by discussion sessions introduced and moderated by selected leading scientists. We see a clear trend from theoretical speculation and not understood experiments to a more mature interaction of theory and experiments who were now “dancing the tango” according to discussion leader Jairo Sinova. We are happy that several contributors chose this workshop to show and discuss unpublished and sometimes spectacular results. An example are the coherent oscillation of domain walls in a large heat current reported by Stuart Parkin from IBM which was observed in record-high laser-generated temperature gradients. Unexpected cross fertilizations occurred as well. The expert in thermoelectrics, Jos Heremans form the Ohio State University, was excited by the ‘fantastic’ theoretical estimates of the spin caloritronics figures of merit of magnetic thermal engines as estimated by Yaroslav Tserkovnyak from UCLA. This implies that for the first time we have found a realistic application perspective of our field, e.g. in thermopower generation and cooling at cryogenic.
While the Keukenhof excursion was a bit of a disappointment since the dry weather of the past few weeks most of the flowers were gone, the BBQ dinner at the North Sea beach was blessed with a spectacular sunset and
All participants have been impressed (again) by the high quality of the Lorentz Center’s premises and expressed their gratitude for the excellent support by the highly motivated staff in spite of the extra strain on the resources due to the large number of participants.
We gratefully acknowledge the financial support by the Lorentz Center and the Kavli Institute of NanoScience Delft.
Gerrit E.W. Bauer (IMR, Tohoku University, Japan, and TU Delft, the Netherlands)
Sadamichi Maekawa (JAEA, Tokai, Japan)