2024-03-28T18:48:57Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2076692021-06-14T08:05:33Zcom_10261_36com_10261_4col_10261_415
Anisotropic Thermal Magnetoresistance in Radiative Heat Transfer
García-Martín, Antonio
Trabajo 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
The 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.
2020-04-15T11:46:08Z
2020-04-15T11:46:08Z
2019-06-30
2020-04-15T11:46:09Z
comunicación de congreso
http://purl.org/coar/resource_type/c_5794
6th International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (2019)
http://hdl.handle.net/10261/207669
Sí
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