Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Focus Session: Magnetic Correlations in Mesoscopic Spin Structures
MA 32.3: Hauptvortrag
Mittwoch, 22. März 2017, 10:30–11:00, HSZ 01
Plasmon-assisted thermal excitations of artificial spin ices — •Paolo Vavassori1,2, Matteo Pancaldi1, and Adrian Crespo1 — 1CIC nanoGUNE, Donostia - San Sebastian 20018, Spain — 2IKERBASQUE, Basque Foundation for Science, Bilbao 48013, Spain
Artificial spin ices (ASIs) are metamaterials consisting of arrays of dipolar-coupled nanomagnets arranged in complex frustrated geometries. Recently, various research groups found ways to create materials where a true thermal annealing protocol could be implemented. This breakthrough enabled the systematic study of thermally active ASI systems.
Recently, it was shown that ferromagnetic nanomagnets support coherent coupling of photons to localized surface plasmon resonances (LSPs), which are collective free-like electron oscillations. As a consequence, the local temperature of the nanomagnet can be increased substantially and in a controlled manner. The energy transfer via excitation of LSPs occurs at a selected and narrow wavelength bandwidth that depends on the size and shape of the nanomagnet, and the polarization of the incident radiation. This allows for a selective heating of a desired subset of nanomagnets of an ASI, depending on their in-plane orientation. In this paper, we present the results of our initial modeling efforts and our first exploratory experiments, aiming at showing the viability and potential of this approach as a novel and improved tool to study the thermal behavior of ASIs. Apart from the investigation of intriguing physic phenomena, this methodology can open a new path to the creation of new opto-thermally active nanomagnet devices.