Attempt to measure magnetic hyperfine fields in metallic thin wires under spin Hall conditions using synchrotron-radiation Mossbauer spectroscopy

作者：Mibu K^*; Mitsui T; Tanaka M A; Masuda R; Kitao S; Kobayashi Y; Yoda Y; Seto M

来源：Journal of Applied Physics, 2015, 117(17): 17E126.

DOI：10.1063/1.4917189

Measurement of the magnetic hyperfine fields in metallic thin wires under spin Hall conditions was attempted using the emerging technique, synchrotron-radiation Mossbauer spectroscopy. A Mossbauer probe layer of Fe-57 (0.2 nm), Fe-57 (0.6 nm), or Sn-119 (0.6 nm) was embedded as an electron spin detector near the surfaces of V, Au, Pt, and Fe-56 wires. The magnitudes of the magnetic hyperfine fields at the Fe-57 and Sn-119 nuclear sites that could be enhanced by non-equilibrium conduction-electron spin polarization were measured both without and with the application of an electric current along the wire. Changes in the Mossbauer spectra were not clearly observed, indicating that the magnetic hyperfine field induced by non-equilibrium spin polarization is smaller than the detection limit at least for the measured systems and conditions.

• 出版日期2015-5-7