Anisotropic magnetothermopower in ferromagnetic thin films grown on macroscopic substrates

• Unintentional thermal gradients along surface normal mitigated via butt-mounting.
• Longitudinal/transverse magnetothermopower measured on many systems.
• Anomalous Nernst Effect reduced.
• Importance of magnetic anisotropy identified with angle-dependent measurements.

We report observing the anisotropic magnetothermopower in a variety of ferromagnetic thin films grown on macroscopic substrates. These measurements were enabled by eliminating spurious signals related to the Anomalous Nernst Effect by butt-mounting the sample to the heat source and sink, and appropriate positioning of electrical contacts to avoid unwanted thermal gradients. This protocol enabled detailed measurements of the magnetothermopower in the transverse and longitudinal configurations. This may enable Spin Seebeck Effect studies in the in-plane geometry.