Abstract
As one invigorated filed of spin caloritronics combining with spin, charge and heat current, the magneto-Seebeck effect has been experimentally and theoretically studied in spin tunneling thin films and nanostructures. Here we analyze the tunnel magneto-Seebeck effect in magnetic tunnel junctions with perpendicular anisotropy (p-MTJs) under various measurement temperatures. The large tunnel magneto-Seebeck (TMS) ratio up to −838.8% for p-MTJs at 200 K is achieved, with Seebeck coefficient S in parallel and antiparallel states of 6.7 mV/K and 62.9 mV/K, respectively. The temperature dependence of the tunnel magneto-Seebeck can be attributed to the contributing transmission function and electron states at the interface between CoFeB electrode and MgO barrier.
Highlights
As one invigorated filed of spin caloritronics combining with spin, charge and heat current, the magneto-Seebeck effect has been experimentally and theoretically studied in spin tunneling thin films and nanostructures
It was found that the magneto-thermoelectric effects in Magnetic tunnel junctions (MTJs) can be characterized by Seebeck coefficients (S), which are different between magnetic parallel (P) and antiparallel (AP) configurations of MTJs
The multilayered MTJs are modeled as a series of the Thomson thermoelectric conductors (TCC) with a cross-sectional area A, and they are connected to the thermal reservoir via an insulating substrate on the other side with tunneling current I
Summary
As one invigorated filed of spin caloritronics combining with spin, charge and heat current, the magneto-Seebeck effect has been experimentally and theoretically studied in spin tunneling thin films and nanostructures. Magneto-Seebeck effect in magnetic tunnel junctions with perpendicular anisotropy
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