Sign determination of spin polarization in L21-ordered Co2FeSi using a Pt- based spin Hall device

被引：8

作者：

Oki, S. ^{[1
]}

Masaki, K. ^{[1
]}

Hashimoto, N. ^{[1
]}

Yamada, S. ^{[1
]}

Miyata, M. ^{[2
]}

Miyao, M. ^{[1
,3
]}

Kimura, T. ^{[2
,3
]}

Hamaya, K. ^{[1
]}

机构：

[1] Kyushu Univ, Dept Elect, Fukuoka 8190395, Japan

[2] Kyushu Univ, INAMORI Frontier Res Ctr, Fukuoka 8190395, Japan

[3] Japan Sci & Technol Agcy, CREST, Tokyo 1020075, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 17期

关键词：

MAGNETIC TUNNEL-JUNCTIONS; ROOM-TEMPERATURE; HEUSLER ALLOYS; MAGNETORESISTANCE;

D O I：

10.1103/PhysRevB.86.174412

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

So far, we have demonstrated markedly high spin polarizations (similar to 0.8) in one of the L2(1)-ordered Heusler compounds, Co2FeSi (CFS), by detecting pure spin currents using nonlocal spin-valve measurements. Here, we experimentally determine the sign of the spin polarization in the L2(1)-ordered CFS using the electrical spin Hall effect (SHE) measurements in a lateral device with Pt. Inverse SHE signals with a positive-sign hysteresis loop are clearly detected at 20 K. Since the spin Hall conductivity of Pt is the positive sign, the pure spin current generated by the CFS electrode with L2(1)-ordered structures has positive spin polarization. The SHE measurement is a powerful tool to determine the sign of the spin polarization in unknown spin injectors.

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页数：4

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