Large magneto-Seebeck effect in magnetic tunnel junctions with half-metallic Heusler electrodes
| Autor: | Boehnke, Alexander, Martens, Ulrike, Sterwerf, Christian, Niesen, Alessia, Huebner, Torsten, von der Ehe, Marvin, Meinert, Markus, Kuschel, Timo, Thomas, Andy, Heiliger, Christian, Münzenberg, Markus, Reiss, Günter |
|---|---|
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Nat. Commun. 8, 1626 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41467-017-01784-x |
| Popis: | Spin caloritronics studies the interplay between charge-, heat- and spin-currents, which are initiated by temperature gradients in magnetic nanostructures. A plethora of new phenomena has been discovered that promises, e.g., to make wasted heat in electronic devices useable or to provide new read-out mechanisms for information. However, only few materials have been studied so far with Seebeck voltages of only some {\mu}V, which hampers applications. Here, we demonstrate that half-metallic Heusler compounds are hot candidates for enhancing spin-dependent thermoelectric effects. This becomes evident when considering the asymmetry of the spin-split density of electronic states around the Fermi level that determines the spin-dependent thermoelectric transport in magnetic tunnel junctions. We identify Co$_2$FeAl and Co$_2$FeSi Heusler compounds as ideal due to their energy gaps in the minority density of states, and demonstrate devices with substantially larger Seebeck voltages and tunnel magneto-Seebeck effect ratios than the commonly used Co-Fe-B based junctions. Comment: 9 pages, 4 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|