Siam Physics Congress 2015

The Study of Spin Seebeck Effect on Iron Alloy.

21 May 2015, 13:00

3h 30m

Board: MNA-53

Poster presentation Material Physics, Nanoscale Physics and Nanotechnology Poster-3

Speaker

Mr Champ Suksawat (Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, THAILAND 40002)

Description

When a magnetized magnet is subjected to a temperature gradient, the difference types of electron spin are separated at both ends of sample. This phenomenon is called spin Seebeck effect (SSE). The tool for observing the SSE involves an inverse spin Hall effect (a conversion of spin current to charge current) by attaching a platinum stripe on the magnetic material. In this study, we observed the SSE in iron alloy materials. The magnetic property of a sample was studied by vibrating sample magnetometer (VSM). The platinum stripes were coated on a surface of iron alloy by lithography evaporation technique. The thickness of the platinum stripe was measured by atomic force microscope (AFM). The morphology of a sample was studied by scanning electron microscope (SEM). The magnetic field and temperature dependence on the SSE were studied. The results show that the saturation of a magnetized material is about 1000 Oe. The thickness of the platinum is about 10 nm. We applied a magnetic flied to the sample in range from 0 to 2500 oersted. The study of magnetic flied dependence on the SSE was found at the hot side in contrast to the cool side. The effects of temperature dependence on the SSE of the hot side and the cool side were clearly separated because the signals had opposite sign. However, in order to confirm the SSE on iron alloy, further studied need to be done to distinguish it from other contaminated signals such as Nernst effect.