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

Department of Materials Science and Engineering

Tel Aviv University

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

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

Keywords

Magnetoresistance
coulomb staircase
double magnetic tunnel junction
island growth

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1080/14786435.2015.1131343

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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

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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

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KW - island growth

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DO - 10.1080/14786435.2015.1131343

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JO - Philosophical Magazine

JF - Philosophical Magazine

IS - 4

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

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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