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The emerging field of spin-caloritronics combines heat-driven transport with spintronics1 and allows promising applications, such as magnetic heat valves or magnetically switchable cooling. However, dimensions in magnetic nanostructures lead to major experimental issues such as insufficient power generation capability and lack of reliable methods to obtain key spin-caloritronic parameters2-3. In contrast, more efficient macroscopic spin-caloritronics devices built from 3D interconnected nanowire (NW) networks, as shown in Fig. 1a, allow magnetically-controlled Peltier cooling of macroscopic components and the directly extraction of accurate key spin-caloritronics parameters. They are fabricated by electrodeposition into 3D nano-porous polymer host membranes with no sample size limitation and show tuneable magnetic properties4-5. The branched structure provides a reasonable mechanical robustness to the networks, while the membrane provides a certain flexibility. The local removing of the cathode from which the NWs are grown yields a two-probe design suitable for transport measurements. As presented in Fig. 1, we developed experimental set-ups for magneto-Seebeck (b) and magneto-Peltier (c) measurements. We studied CoNi/Cu multilayered NW networks that show at room-temperature magnetically modulated power factors with values comparable to that of bismuth telluride and large spin-dependent Seebeck and Peltier coefficients. We directly observed Peltier cooling at the electrode-NW network junction with large Peltier cooling ability. Those observations hold promise for magnetically modulated refrigeration using light and flexible thermoelectric generators and may lead to advances in future spin-caloritronic devices.
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da Câmara Santa Clara Gomes, T., Abreu Araujo, F., & Piraux, L. (2019). Flexible spin caloritronic devices based on 3D nanowire networks. Spin Caloritronics X, Groningen, Holland. https://hdl.handle.net/2078.5/24417