Visualization of Anomalous Ettingshausen Effect in a Ferromagnetic Film: Direct Evidence of Different Symmetry from Spin Peltier Effect

TL;DR

This study visualizes the anomalous Ettingshausen effect in a ferromagnetic FePt film, demonstrating its distinct symmetry from the spin Peltier effect through thermography and numerical analysis.

Contribution

It provides the first direct visualization of AEE's spatial temperature distribution and highlights its different symmetry compared to SPE in ferromagnetic films.

Findings

AEE heat source distribution depends on magnetization direction.

Distinct temperature profiles observed for in-plane and out-of-plane magnetizations.

Experimental results align with numerical calculations.

Abstract

Spatial distribution of temperature modulation due to anomalous Ettingshausen effect (AEE) is visualized in a ferromagnetic FePt thin film with in-plane and out-of-plane magnetizations using the lock-in thermography technique. Comparing the AEE of FePt with the spin Peltier effect (SPE) of a Pt / yttrium iron garnet junction provides direct evidence of different symmetries of AEE and SPE. Our experiments and numerical calculations reveal that the distribution of heat sources induced by AEE strongly depends on the direction of magnetization, leading to the remarkable different temperature profiles in the FePt thin film between the in-plane and perpendicularly magnetized configurations.