Effect of Co and Fe stoichiometry on terahertz emission from Ta/(CoxFe1-x)80 B20/MgO thin films

Yuta Sasaki; Yohei Kota; Satoshi Iihama; Kazuya Suzuki; Akimasa Sakuma; Shigemi Mizukami

doi:10.1103/PhysRevB.100.140406

Effect of Co and Fe stoichiometry on terahertz emission from Ta/(CoxFe1-x)80 B20/MgO thin films

Yuta Sasaki, Yohei Kota, Satoshi Iihama, Kazuya Suzuki, Akimasa Sakuma, Shigemi Mizukami

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

14 Citations (Scopus)

Abstract

Laser pulse induced terahertz (THz) emission from Ta/(CoxFe1-x)80B20/MgO thin films, with varying compositions x and annealing temperatures, is investigated. With increasing annealing temperature, the THz emission intensity exhibits significant dependence on x, with maxima at x of 0.1-0.3. The x dependence of the THz emission originated from the composition dependence of the spin currents induced in CoxFe1-x formed by the crystallization of amorphous CoFeB after the annealing. The origin of the laser-induced spin current is qualitatively discussed in terms of a ballistic transport of hot electrons and a spin-dependent Seebeck effect with different compositions.

Original language	English
Article number	140406
Journal	Physical Review B
Volume	100
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.100.140406
Publication status	Published - 2019 Oct 11

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.100.140406

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title = "Effect of Co and Fe stoichiometry on terahertz emission from Ta/(CoxFe1-x)80 B20/MgO thin films",

abstract = "Laser pulse induced terahertz (THz) emission from Ta/(CoxFe1-x)80B20/MgO thin films, with varying compositions x and annealing temperatures, is investigated. With increasing annealing temperature, the THz emission intensity exhibits significant dependence on x, with maxima at x of 0.1-0.3. The x dependence of the THz emission originated from the composition dependence of the spin currents induced in CoxFe1-x formed by the crystallization of amorphous CoFeB after the annealing. The origin of the laser-induced spin current is qualitatively discussed in terms of a ballistic transport of hot electrons and a spin-dependent Seebeck effect with different compositions.",

author = "Yuta Sasaki and Yohei Kota and Satoshi Iihama and Kazuya Suzuki and Akimasa Sakuma and Shigemi Mizukami",

note = "Funding Information: Y.S. acknowledges the Graduate Program in Spintronics (GP-Spin) at Tohoku University. This work was partially supported by KAKENHI (Grants No. 16H03846 and No. 26103004), CSRN, and CREST (Grant No. JPMJCR17J5). Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = oct,

day = "11",

doi = "10.1103/PhysRevB.100.140406",

language = "English",

volume = "100",

journal = "Physical Review B",

issn = "2469-9950",

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TY - JOUR

T1 - Effect of Co and Fe stoichiometry on terahertz emission from Ta/(CoxFe1-x)80 B20/MgO thin films

AU - Sasaki, Yuta

AU - Kota, Yohei

AU - Iihama, Satoshi

AU - Suzuki, Kazuya

AU - Sakuma, Akimasa

AU - Mizukami, Shigemi

N1 - Funding Information: Y.S. acknowledges the Graduate Program in Spintronics (GP-Spin) at Tohoku University. This work was partially supported by KAKENHI (Grants No. 16H03846 and No. 26103004), CSRN, and CREST (Grant No. JPMJCR17J5). Publisher Copyright: © 2019 American Physical Society.

PY - 2019/10/11

Y1 - 2019/10/11

N2 - Laser pulse induced terahertz (THz) emission from Ta/(CoxFe1-x)80B20/MgO thin films, with varying compositions x and annealing temperatures, is investigated. With increasing annealing temperature, the THz emission intensity exhibits significant dependence on x, with maxima at x of 0.1-0.3. The x dependence of the THz emission originated from the composition dependence of the spin currents induced in CoxFe1-x formed by the crystallization of amorphous CoFeB after the annealing. The origin of the laser-induced spin current is qualitatively discussed in terms of a ballistic transport of hot electrons and a spin-dependent Seebeck effect with different compositions.

AB - Laser pulse induced terahertz (THz) emission from Ta/(CoxFe1-x)80B20/MgO thin films, with varying compositions x and annealing temperatures, is investigated. With increasing annealing temperature, the THz emission intensity exhibits significant dependence on x, with maxima at x of 0.1-0.3. The x dependence of the THz emission originated from the composition dependence of the spin currents induced in CoxFe1-x formed by the crystallization of amorphous CoFeB after the annealing. The origin of the laser-induced spin current is qualitatively discussed in terms of a ballistic transport of hot electrons and a spin-dependent Seebeck effect with different compositions.

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DO - 10.1103/PhysRevB.100.140406

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IS - 14

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ER -

Effect of Co and Fe stoichiometry on terahertz emission from Ta/(CoxFe1-x)80 B20/MgO thin films

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