Observation of single-spin transport in an island-shaped CoFeB double magnetic tunnel junction prepared by magnetron sputtering

Thamrongsin Siripongsakul; Hiroshi Naganuma; Andras Kovacs; Amit Kohn; Mikihiko Oogane; Yasuo Ando

doi:10.1080/14786435.2015.1131343

Observation of single-spin transport in an island-shaped CoFeB double magnetic tunnel junction prepared by magnetron sputtering

Thamrongsin Siripongsakul, Hiroshi Naganuma, Andras Kovacs, Amit Kohn, Mikihiko Oogane, Yasuo Ando

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

3 Scopus citations

Abstract

The Co₄₀Fe₄₀B₂₀(CFB)/MgO/CFB/MgO/CFB-based multilayer was prepared by conventional magnetron sputtering and utilised in the fabrication of double magnetic tunnel junctions (DMTJs) for which the middle CFB layers were island-shaped. By analysing the magnetic property of the CFB islands with Langevins equation, it was possible to identify their diameters of 7.6, 8.9 and 11.0 nm; accordingly submicron-scaled DMTJs were fabricated to investigate single-spin transport phenomena. The coulomb staircase and the oscillatory tunnel magnetoresistive (TMR) were able to be observed at 6 K, where the TMR ratio was enhanced up to 60%, which is the highest value ever achieved in this structure.

Original language	English
Pages (from-to)	310-319
Number of pages	10
Journal	Philosophical Magazine
Volume	96
Issue number	4
DOIs	https://doi.org/10.1080/14786435.2015.1131343
State	Published - 1 Feb 2016
Externally published	Yes

Keywords

Magnetoresistance
coulomb staircase
double magnetic tunnel junction
island growth

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/14786435.2015.1131343

Cite this

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title = "Observation of single-spin transport in an island-shaped CoFeB double magnetic tunnel junction prepared by magnetron sputtering",

abstract = "The Co40Fe40B20(CFB)/MgO/CFB/MgO/CFB-based multilayer was prepared by conventional magnetron sputtering and utilised in the fabrication of double magnetic tunnel junctions (DMTJs) for which the middle CFB layers were island-shaped. By analysing the magnetic property of the CFB islands with Langevins equation, it was possible to identify their diameters of 7.6, 8.9 and 11.0 nm; accordingly submicron-scaled DMTJs were fabricated to investigate single-spin transport phenomena. The coulomb staircase and the oscillatory tunnel magnetoresistive (TMR) were able to be observed at 6 K, where the TMR ratio was enhanced up to 60%, which is the highest value ever achieved in this structure.",

keywords = "Magnetoresistance, coulomb staircase, double magnetic tunnel junction, island growth",

author = "Thamrongsin Siripongsakul and Hiroshi Naganuma and Andras Kovacs and Amit Kohn and Mikihiko Oogane and Yasuo Ando",

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AU - Siripongsakul, Thamrongsin

AU - Naganuma, Hiroshi

AU - Kovacs, Andras

AU - Kohn, Amit

AU - Oogane, Mikihiko

AU - Ando, Yasuo

PY - 2016/2/1

Y1 - 2016/2/1

N2 - The Co40Fe40B20(CFB)/MgO/CFB/MgO/CFB-based multilayer was prepared by conventional magnetron sputtering and utilised in the fabrication of double magnetic tunnel junctions (DMTJs) for which the middle CFB layers were island-shaped. By analysing the magnetic property of the CFB islands with Langevins equation, it was possible to identify their diameters of 7.6, 8.9 and 11.0 nm; accordingly submicron-scaled DMTJs were fabricated to investigate single-spin transport phenomena. The coulomb staircase and the oscillatory tunnel magnetoresistive (TMR) were able to be observed at 6 K, where the TMR ratio was enhanced up to 60%, which is the highest value ever achieved in this structure.

AB - The Co40Fe40B20(CFB)/MgO/CFB/MgO/CFB-based multilayer was prepared by conventional magnetron sputtering and utilised in the fabrication of double magnetic tunnel junctions (DMTJs) for which the middle CFB layers were island-shaped. By analysing the magnetic property of the CFB islands with Langevins equation, it was possible to identify their diameters of 7.6, 8.9 and 11.0 nm; accordingly submicron-scaled DMTJs were fabricated to investigate single-spin transport phenomena. The coulomb staircase and the oscillatory tunnel magnetoresistive (TMR) were able to be observed at 6 K, where the TMR ratio was enhanced up to 60%, which is the highest value ever achieved in this structure.

KW - Magnetoresistance

KW - coulomb staircase

KW - double magnetic tunnel junction

KW - island growth

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ER -

Observation of single-spin transport in an island-shaped CoFeB double magnetic tunnel junction prepared by magnetron sputtering

Abstract

Keywords

ASJC Scopus subject areas

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