Nernst-Ettingshausen effect in thin Pt and W films at low temperatures

Abstract

As spin caloritronic measurements become increasingly common techniques for characterizing material properties, it is important to quantify potentially confounding effects. We report measurements of the Nernst-Ettingshausen response from room temperature to 5 K in thin film wires of Pt and W, metals commonly used as inverse spin Hall detectors in spin Seebeck characterization. Johnson-Nyquist noise thermometry is used to assess the temperature change of the metals with heater power at low temperatures, and the thermal path is analyzed via finite-element modeling. The Nernst-Ettingshausen response of W is found to be approximately temperature-independent, while the response of Pt increases at low temperatures. These results are discussed in the context of theoretical expectations and the possible role of magnetic impurities in Pt.

14 pages, 3 figures + supplementary material of 12 pages and 5 figures

References in corpus (4)

• The Nernst effect and the boundaries of the Fermi liquid picture
• Observation of spin current in quantum spin liquid
• Spin Seebeck devices using local on-chip heating
• Nernst-Ettingshausen effect in thin Pt and W films at low temperatures

Cited by in corpus (1)

• Nernst-Ettingshausen effect in thin Pt and W films at low temperatures