DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2017 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MM: Fachverband Metall- und Materialphysik

MM 22: Poster session I

MM 22.42: Poster

Monday, March 20, 2017, 19:00–20:00, P4

Relational expression between spin polarization ratio and anisotropic magnetoresistance ratio for nearly half-metallic ferromagnets — •Satoshi Kokado1, Yuya Sakuraba2, and Masakiyo Tsunoda31Shizuoka University, Hamamatsu, Japan — 2National Institute for Materials Science, Tsukuba, Japan — 3Tohoku University, Sendai, Japan

A current-perpendicular-to-plane giant magnetoresistance effect for ferromagnet/metal/ferromagnet junctions increases with increasing the spin polarization ratio of resistivity, Pρ, in the ferromagnet. A simple method to estimate Pρ, however, has scarcely been proposed. In this study, we derive a simple relational expression between Pρ and the anisotropic magnetoresistance ratio Δ ρ/ρ, and that between the spin polarization ratio of the density of states at the Fermi energy, PDOS, and Δ ρ/ρ for nearly half-metallic ferromagnets [1]. We here use the two-current model for a system consisting of a spin-polarized conduction state and localized d states with spin–orbit interaction [1-3]. We find that Pρ and PDOS increase with increasing Δ ρ/ρ from 0 to a maximum value. In addition, we investigate Pρ and PDOS for a Co2FeGa0.5Ge0.5 Heusler alloy [4] by substituting its experimentally observed Δ ρ/ρ into the respective expressions.

[1] S. Kokado et al., Jpn. J. Appl. Phys. 55, 108004 (2016).
[2] S. Kokado et al., J. Phys. Soc. Jpn. 81, 024705 (2012).
[3] S. Kokado et al., Adv. Mater. Res. 750-752, 978 (2013).
[4] Y. Sakuraba et al., Appl. Phys. Lett. 104, 172407 (2014).

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2017 > Dresden