Nonreciprocity of electrically excited thermal spin signals in CoFeAl-Cu-Py lateral spin valves

Shaojie Hu, Xiaomin Cui, Tatsuya Nomura, Tai Min, Takashi Kimura

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Electrical and thermal spin currents excited by an electric current have been systematically investigated in lateral spin valves consisting of CoFeAl and Ni80Fe20 (Py) wires bridged by a Cu strip. In the electrical spin signal, the reciprocity between the current and voltage probes was clearly confirmed. However, a significant nonreciprocity was observed in the thermal spin signal. This provides clear evidence that a large spin-dependent Seebeck coefficient is more important than the spin polarization for efficient thermal spin injection and detection. We demonstrate that the spin-dependent Seebeck coefficient can be simply evaluated from the thermal spin signals for two configurations. Our experimental description paves a way for evaluating a small spin-dependent Seebeck coefficient for conventional ferromagnets without using complicated parameters.

Original languageEnglish
Article number100403
JournalPhysical Review B
Volume95
Issue number10
DOIs
Publication statusPublished - Mar 20 2017

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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