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Anisotropic Thermal Magnetoresistance in Radiative Heat Transfer

AuthorsGarcía-Martín, Antonio
Issue Date30-Jun-2019
Citation6th International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (2019)
AbstractThe possibility to create and manipulate nanostructured materials encouraged the exploration of new strategies to control the electromagnetic properties without the need to modify its physical structure, i.e. by means of an external agent. An approach is the combination of magneto-optically active and resonant materials (e.g. plasmonic modes), where it is feasible to control the optical properties with magnetic fields in connection to the excitation of resonances1 (magnetoplasmonics). It has been shown that these nanostructures can be employed to modulate the propagation wavevector of SPPs2 , which allows the development of label free sensors with enhanced capabilities3-5 or to enhance the magneto-optical response in isolated entities as well as films, in connection with a strong localization of the electromagnetic field.6-8 Here we will show that they also play a crucial role in the active control of thermal emission and the radiative heat transfer (RHT).9-11 In particular Near Field RHT between two MO particles can be efficiently controlled by changing the direction of the magnetic field, in the spirit of the Anisotropic Magneto Resistance in spintronics.11This phenomenon, which we term anisotropic thermal magnetoresistance (ATMR), stems from the anisotropy of the photon tunneling induced by the magnetic field. We discuss this effect through the analysis of the radiative heat exchange between two InSb particles, and show that the ATMR can reach amplitudes of 100% for fields on the order of 1 T and up to 1000% for a magnetic field of 6 T. These values are several orders of magnitude larger than in standard spintronic devices. More importantly, this thermomagnetic effect paves the way for exploring heat transfer physics at pico- and even subpicosecond time scales, which are even shorter than the relaxation time of heat carriers. Moreover, we show that the heat flux is very sensitive to the magnetic field direction, which makes this effect very promising for the development of a new generation of thermal and magnetic sensors.
DescriptionTrabajo presentado en el 6th International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (6th IC4N), celebrado en Corfu (Grecia), del 30 de junio al 3 de julio de 2019
Appears in Collections:(IMN-CNM) Comunicaciones congresos
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