Structure, magnetic property, and spin polarization of Co2 FeAlx Si1-x Heusler alloys

T. M. Nakatani; A. Rajanikanth; Z. Gercsi; Y. K. Takahashi; K. Inomata; K. Hono

doi:10.1063/1.2767229

Structure, magnetic property, and spin polarization of Co2 FeAlx Si1-x Heusler alloys

T. M. Nakatani^*, A. Rajanikanth, Z. Gercsi, Y. K. Takahashi, K. Inomata, K. Hono

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

140 Citations (Scopus)

Abstract

We report the spin polarization of Co2 FeAlx Si1-x (x=0.0, 0.3, 0.5, 0.7) bulk alloys measured by the point contact Andreev reflection method. All the Co2 FeAlx Si1-x alloys had an L 21 structure along with A2 - and B2 -type disorder. Several off-stoichiometric alloys (Cox Fey Al0.5 Si0.5) were prepared to understand the effect of the compositional deviation from the stoichiometry on the spin polarization. By substituting Al for Si, the spin polarization changed from 0.57±0.01 for x=0.0 to a maximum value of 0.60±0.01 for x=0.5. The off-stoichiometric alloys had spin polarizations of 0.57-0.60±0.01. Ab initio calculations were performed to interpret the effect of Al addition as well as the effect of disorder on the magnetic properties and on the electronic structure.

Original language	English
Article number	033916
Journal	Journal of Applied Physics
Volume	102
Issue number	3
DOIs	https://doi.org/10.1063/1.2767229
Publication status	Published - 2007
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Structure, magnetic property, and spin polarization of Co2 FeAlx Si1-x Heusler alloys",

abstract = "We report the spin polarization of Co2 FeAlx Si1-x (x=0.0, 0.3, 0.5, 0.7) bulk alloys measured by the point contact Andreev reflection method. All the Co2 FeAlx Si1-x alloys had an L 21 structure along with A2 - and B2 -type disorder. Several off-stoichiometric alloys (Cox Fey Al0.5 Si0.5) were prepared to understand the effect of the compositional deviation from the stoichiometry on the spin polarization. By substituting Al for Si, the spin polarization changed from 0.57±0.01 for x=0.0 to a maximum value of 0.60±0.01 for x=0.5. The off-stoichiometric alloys had spin polarizations of 0.57-0.60±0.01. Ab initio calculations were performed to interpret the effect of Al addition as well as the effect of disorder on the magnetic properties and on the electronic structure.",

author = "Nakatani, {T. M.} and A. Rajanikanth and Z. Gercsi and Takahashi, {Y. K.} and K. Inomata and K. Hono",

note = "Funding Information: T.M.N and A.R. acknowledge the National Institute for Materials Science (NIMS) for the provision of a NIMS junior research assistantship. Z.G. is grateful to the Japan Society for the Promotion of Science (JSPS) for the JSPS fellowship. This work was in part supported by the Ministry of Education, Science, Sports and Culture of Japan, Grant-in-Aid for Young Scientists (B), 18760537, 2006.",

year = "2007",

doi = "10.1063/1.2767229",

language = "English",

volume = "102",

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T1 - Structure, magnetic property, and spin polarization of Co2 FeAlx Si1-x Heusler alloys

AU - Nakatani, T. M.

AU - Rajanikanth, A.

AU - Gercsi, Z.

AU - Takahashi, Y. K.

AU - Inomata, K.

AU - Hono, K.

N1 - Funding Information: T.M.N and A.R. acknowledge the National Institute for Materials Science (NIMS) for the provision of a NIMS junior research assistantship. Z.G. is grateful to the Japan Society for the Promotion of Science (JSPS) for the JSPS fellowship. This work was in part supported by the Ministry of Education, Science, Sports and Culture of Japan, Grant-in-Aid for Young Scientists (B), 18760537, 2006.

PY - 2007

Y1 - 2007

N2 - We report the spin polarization of Co2 FeAlx Si1-x (x=0.0, 0.3, 0.5, 0.7) bulk alloys measured by the point contact Andreev reflection method. All the Co2 FeAlx Si1-x alloys had an L 21 structure along with A2 - and B2 -type disorder. Several off-stoichiometric alloys (Cox Fey Al0.5 Si0.5) were prepared to understand the effect of the compositional deviation from the stoichiometry on the spin polarization. By substituting Al for Si, the spin polarization changed from 0.57±0.01 for x=0.0 to a maximum value of 0.60±0.01 for x=0.5. The off-stoichiometric alloys had spin polarizations of 0.57-0.60±0.01. Ab initio calculations were performed to interpret the effect of Al addition as well as the effect of disorder on the magnetic properties and on the electronic structure.

AB - We report the spin polarization of Co2 FeAlx Si1-x (x=0.0, 0.3, 0.5, 0.7) bulk alloys measured by the point contact Andreev reflection method. All the Co2 FeAlx Si1-x alloys had an L 21 structure along with A2 - and B2 -type disorder. Several off-stoichiometric alloys (Cox Fey Al0.5 Si0.5) were prepared to understand the effect of the compositional deviation from the stoichiometry on the spin polarization. By substituting Al for Si, the spin polarization changed from 0.57±0.01 for x=0.0 to a maximum value of 0.60±0.01 for x=0.5. The off-stoichiometric alloys had spin polarizations of 0.57-0.60±0.01. Ab initio calculations were performed to interpret the effect of Al addition as well as the effect of disorder on the magnetic properties and on the electronic structure.

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Structure, magnetic property, and spin polarization of Co2 FeAlx Si1-x Heusler alloys

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