AI Article Synopsis
- A laser beam creates temperature differences in ferromagnetic thin films like Co2FeAl and Y3Fe5O12, leading to local charge and spin currents.
- We observe the anomalous Nernst effect (ANE) in Co2FeAl by measuring voltage changes based on laser position and magnetic field settings.
- The spin Seebeck effect (SSE) is investigated in Y3Fe5O12 using a Pt layer to detect spin currents, demonstrating new methods for imaging thermal spin and charge current generation.
Article Abstract
A scannable laser beam is used to generate local thermal gradients in metallic (Co2FeAl) or insulating (Y3Fe5O12) ferromagnetic thin films. We study the resulting local charge and spin currents that arise due to the anomalous Nernst effect (ANE) and the spin Seebeck effect (SSE), respectively. In the local ANE experiments, we detect the voltage in the Co2FeAl thin film plane as a function of the laser-spot position and external magnetic field magnitude and orientation. The local SSE effect is detected in a similar fashion by exploiting the inverse spin Hall effect in a Pt layer deposited on top of the Y3Fe5O12. Our findings establish local thermal spin and charge current generation as well as spin caloritronic domain imaging.
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| http://dx.doi.org/10.1103/PhysRevLett.108.106602 | DOI Listing |
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