Efficient thermal spin injection in metallic nanostructures

Tatsuya Nomura, Taisei Ariki, Shaojie Hu, Takashi Kimura

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Thermal spin injection is a unique and fascinating method for generating spin current. If magnetization can be controlled by thermal spin injection, various advantages will be provided in spintronic devices, through its wireless controllability. However, the generation efficiency of thermal spin injection is believed to be lower than that of electrical spin injection. Here, we explore a suitable ferromagnetic metal for an efficient thermal spin injection, via systematic experiments based on diffusive spin transport under temperature gradients. Since a ferromagnetic metal with strong spin splitting is expected to have a large spin-dependent Seebeck coefficient, a lateral spin valve based on CoFe electrodes has been fabricated. However, the superior thermal spin injection property has not been observed, because the CoFe electrode retained its crystalline signature - where s-like electrons dominate the transport property in the ferromagnet. To suppress the crystalline signature, we adopt a CoFeAl electrode, in which the Al impurity significantly reduces the contribution from s-like electrons. Highly efficient thermal spin injection has been demonstrated using this CoFeAl electrode. Further optimization for thermal spin injection has been demonstrated by adjusting the Co and Fe composition.

Original languageEnglish
Article number465003
JournalJournal of Physics D: Applied Physics
Volume50
Issue number46
DOIs
Publication statusPublished - Oct 25 2017

Fingerprint

Nanostructures
injection
Electrodes
Ferromagnetic materials
Crystalline materials
Electron transport properties
electrodes
Electron tubes
Magnetoelectronics
Seebeck coefficient
Electrons
Hot Temperature
Controllability
Thermal gradients
Magnetization
signatures
Impurities
controllability
Seebeck effect
metals

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Efficient thermal spin injection in metallic nanostructures. / Nomura, Tatsuya; Ariki, Taisei; Hu, Shaojie; Kimura, Takashi.

In: Journal of Physics D: Applied Physics, Vol. 50, No. 46, 465003, 25.10.2017.

Research output: Contribution to journalArticle

Nomura, Tatsuya ; Ariki, Taisei ; Hu, Shaojie ; Kimura, Takashi. / Efficient thermal spin injection in metallic nanostructures. In: Journal of Physics D: Applied Physics. 2017 ; Vol. 50, No. 46.
@article{87e8b85ef5534dca9ec380b5ecb22902,
title = "Efficient thermal spin injection in metallic nanostructures",
abstract = "Thermal spin injection is a unique and fascinating method for generating spin current. If magnetization can be controlled by thermal spin injection, various advantages will be provided in spintronic devices, through its wireless controllability. However, the generation efficiency of thermal spin injection is believed to be lower than that of electrical spin injection. Here, we explore a suitable ferromagnetic metal for an efficient thermal spin injection, via systematic experiments based on diffusive spin transport under temperature gradients. Since a ferromagnetic metal with strong spin splitting is expected to have a large spin-dependent Seebeck coefficient, a lateral spin valve based on CoFe electrodes has been fabricated. However, the superior thermal spin injection property has not been observed, because the CoFe electrode retained its crystalline signature - where s-like electrons dominate the transport property in the ferromagnet. To suppress the crystalline signature, we adopt a CoFeAl electrode, in which the Al impurity significantly reduces the contribution from s-like electrons. Highly efficient thermal spin injection has been demonstrated using this CoFeAl electrode. Further optimization for thermal spin injection has been demonstrated by adjusting the Co and Fe composition.",
author = "Tatsuya Nomura and Taisei Ariki and Shaojie Hu and Takashi Kimura",
year = "2017",
month = "10",
day = "25",
doi = "10.1088/1361-6463/aa8b5b",
language = "English",
volume = "50",
journal = "Journal Physics D: Applied Physics",
issn = "0022-3727",
publisher = "IOP Publishing Ltd.",
number = "46",

}

TY - JOUR

T1 - Efficient thermal spin injection in metallic nanostructures

AU - Nomura, Tatsuya

AU - Ariki, Taisei

AU - Hu, Shaojie

AU - Kimura, Takashi

PY - 2017/10/25

Y1 - 2017/10/25

N2 - Thermal spin injection is a unique and fascinating method for generating spin current. If magnetization can be controlled by thermal spin injection, various advantages will be provided in spintronic devices, through its wireless controllability. However, the generation efficiency of thermal spin injection is believed to be lower than that of electrical spin injection. Here, we explore a suitable ferromagnetic metal for an efficient thermal spin injection, via systematic experiments based on diffusive spin transport under temperature gradients. Since a ferromagnetic metal with strong spin splitting is expected to have a large spin-dependent Seebeck coefficient, a lateral spin valve based on CoFe electrodes has been fabricated. However, the superior thermal spin injection property has not been observed, because the CoFe electrode retained its crystalline signature - where s-like electrons dominate the transport property in the ferromagnet. To suppress the crystalline signature, we adopt a CoFeAl electrode, in which the Al impurity significantly reduces the contribution from s-like electrons. Highly efficient thermal spin injection has been demonstrated using this CoFeAl electrode. Further optimization for thermal spin injection has been demonstrated by adjusting the Co and Fe composition.

AB - Thermal spin injection is a unique and fascinating method for generating spin current. If magnetization can be controlled by thermal spin injection, various advantages will be provided in spintronic devices, through its wireless controllability. However, the generation efficiency of thermal spin injection is believed to be lower than that of electrical spin injection. Here, we explore a suitable ferromagnetic metal for an efficient thermal spin injection, via systematic experiments based on diffusive spin transport under temperature gradients. Since a ferromagnetic metal with strong spin splitting is expected to have a large spin-dependent Seebeck coefficient, a lateral spin valve based on CoFe electrodes has been fabricated. However, the superior thermal spin injection property has not been observed, because the CoFe electrode retained its crystalline signature - where s-like electrons dominate the transport property in the ferromagnet. To suppress the crystalline signature, we adopt a CoFeAl electrode, in which the Al impurity significantly reduces the contribution from s-like electrons. Highly efficient thermal spin injection has been demonstrated using this CoFeAl electrode. Further optimization for thermal spin injection has been demonstrated by adjusting the Co and Fe composition.

UR - http://www.scopus.com/inward/record.url?scp=85032800785&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85032800785&partnerID=8YFLogxK

U2 - 10.1088/1361-6463/aa8b5b

DO - 10.1088/1361-6463/aa8b5b

M3 - Article

AN - SCOPUS:85032800785

VL - 50

JO - Journal Physics D: Applied Physics

JF - Journal Physics D: Applied Physics

SN - 0022-3727

IS - 46

M1 - 465003

ER -