Asymmetric nonlocal signal induced by thermoelectric effects in a lateral spin valve

Publication date: Available online 9 October 2019Source: Physica E: Low-dimensional Systems and NanostructuresAuthor(s): Nagarjuna Asam, Taisei Ariki, Takashi KimuraAbstractWe demonstrate that the heat flow arising from the Joule heating produces not only the conventional thermal spin injection but also additional thermo-electric effects both in current and voltage probes. The excellent thermal spin injection property for the CoFeAl enables us to distinguish the ordinal thermal spin valve signal and the unconventional asymmetric field dependence in the nonlocal 2nd harmonic signal. We show that the observed unique field dependence can be well explained by the anomalous Nenrst effect in the ferromagnetic voltage probe and the anomalous thermal Hall effect in the ferromagnetic current probe. The validity of the proposed mechanism was confirmed in various devices with different probe configurations.Graphical abstractHeat injection through the ferromagnetic/nonmagnetic junction produces the thermal Hall effect, resulting in the asymmetric field dependence of then on local spin valve signal.

Source: Physica E: Low dimensional Systems and Nanostructures - October 10, 2019 Category: Nanotechnology Source Type: research