TY - JOUR
T1 - Current-induced spin polarization on a Pt surface
T2 - A new approach using spin-polarized positron annihilation spectroscopy
AU - Kawasuso, A.
AU - Fukaya, Y.
AU - Maekawa, M.
AU - Zhang, H.
AU - Seki, T.
AU - Yoshino, T.
AU - Saitoh, E.
AU - Takanashi, K.
N1 - Funding Information:
We thank S. Maekawa and J. Ieda of the Japan Atomic Energy Agency for their valuable comments. This work was supported by the JSPS KAKENHI Grant no. 24310072 .
PY - 2013
Y1 - 2013
N2 - Transversely spin-polarized positrons were injected near Pt and Au surfaces under an applied electric current. The three-photon annihilation of spin-triplet positronium, which was emitted from the surfaces into vacuum, was observed. When the positron spin polarization was perpendicular to the current direction, the maximum asymmetry of the three-photon annihilation intensity was observed upon current reversal for the Pt surfaces, whereas it was significantly reduced for the Au surface. The experimental results suggest that electrons near the Pt surfaces were in-plane and transversely spin-polarized with respect to the direction of the electric current. The maximum electron spin polarization was estimated to be more than 001 (1%).
AB - Transversely spin-polarized positrons were injected near Pt and Au surfaces under an applied electric current. The three-photon annihilation of spin-triplet positronium, which was emitted from the surfaces into vacuum, was observed. When the positron spin polarization was perpendicular to the current direction, the maximum asymmetry of the three-photon annihilation intensity was observed upon current reversal for the Pt surfaces, whereas it was significantly reduced for the Au surface. The experimental results suggest that electrons near the Pt surfaces were in-plane and transversely spin-polarized with respect to the direction of the electric current. The maximum electron spin polarization was estimated to be more than 001 (1%).
KW - Positron annihilation
KW - Positronium
KW - Surface magnetism
KW - Surface spin accumulation
UR - http://www.scopus.com/inward/record.url?scp=84885111544&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84885111544&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2013.04.006
DO - 10.1016/j.jmmm.2013.04.006
M3 - Article
AN - SCOPUS:84885111544
VL - 342
SP - 139
EP - 143
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
ER -